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20 March 2020, Volume 26 Issue 2 Previous Issue    Next Issue

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Analysis of China’s Rice Industry in 2019 and the Outlook for 2020 2020, 26(2): 1-4.  DOI: 10.3969/j.issn.1006-8082.2020.02.001 Abstract ( )   PDF (552KB) ( )   In 2019, the total production of rice in China has been kept at over 200 million tons for nine consecutive years with continued decline in sowing area and a record high level of the yield, which reached 7.05 ton per hactare. The domestic market remains weak and is much worse than that of 2018, accompanied with a widening difference in prices between high quality rice and common rice. There were a slightly reduction in imports but an obviously increase in exports. The seed industry developed steadily with an improving structure. the green technology in rice production revealed a momentum for rapid growth, pushing the green development in rice industry. It is projected that there is going to be a same level or decrease slightly in rice area and the yield will hold steady in 2020, the rice market may will pull out of its slump, and a continuously optimized structure of rice varieties, as well as a faster development of the green technology in rice production.

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Research Progress on Nitrogen Nutrition Diagnosis Methods of Rice 2020, 26(2): 5-8.  DOI: 10.3969/j.issn.1006-8082.2020.02.002 Abstract ( )   PDF (652KB) ( )   At present, rice nitrogen nutrition diagnosis methods mainly include appearance diagnosis, chemical diagnosis and modern nitrogen nutrition diagnosis. The appearance diagnosis include color diagnosis, growth and appearance diagnosis. Chemical diagnosis include total nitrogen diagnosis and nitrate diagnosis. Modern nitrogen nutrition diagnosis include chlorophyll measuring instrument, machine vision and hyperspectral remote sensing. In this paper, various diagnostic methods and relevant application results in recent years are described, and the advantages and disadvantages of each method are analyzed, which would provide some references and ideas for researchers.

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Effects of Shading on Stem Morphological Traits and Lodging Resistance in Heavy Type Panicle of Indica Rice 2020, 26(2): 9-13.  DOI: 10.3969/j.issn.1006-8082.2020.02.003 Abstract ( )   PDF (612KB) ( )   A field experiments was conducted by using shading condition （S） and normal light （CK）, with heavy-panicle type of indica rice Yuxiang 203 （YX203） and multi-panicle type of indica rice Cliangyouhuazhan （CLYHZ）. Stem physical strength parameters, plant height, gravity center height, length of internodes and stem morphological traits of lower internodes were investigated, and their relationship with lodging resistance was also analyzed. Compared with CK, shading significantly reduced grain yield of YX203, which induced by reduction of panicles, spikelets and 1000-weight, CLYHZ showed similar trends with YX203. Compared with CK, shading decreased bending moment by whole plant （WP） with significant difference, the lodging index was not reduced but increased, owing to highly reduction of breaking resistance （M）. The bending stress （BS） and section modulus （Z） were decreased by 5.1%, 25.5% in YX203 and 19.3%, 12.6% in CLYHZ under shading condition. Further, shading significantly reduced culm diameter and culm wall thickness of YX203 by 9.1% and 11.9%, respectively, which were consistent with reduction of Z value; and remarkably reduced culm weight and leaf sheath weight per cm in CLYHZ by 25.6% and 14.4%, which were consistent with decrease of BS value. These results suggested that shading significantly reduced breaking resistance of lower internodes of heavy-panicle type of indica rice, and thereby, increased lodging risks, and decreased grain yield. Increasing Z value of heavy-panicle type of indica rice by improvement of culm diameter and culm wall thickness of lower internodes, could be an effective way to enhancing stem strength and lodging resistance under shading condition.

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Effects of Different Lighting Quality and Intensities on Seedling Quality of Rice in Cold Region 2020, 26(2): 14-18.  DOI: 10.3969/j.issn.1006-8082.2020.02.004 Abstract ( )   PDF (505KB) ( )   By using different genotype of rice varieties （strains） suitable for cultivation in cold region as experimental materials, the effects of light on the growth of rice seedlings were studied by setting different light quality and light intensities with LED lights at seedling stage, in order to provide reference for indoor cultivation of rice in cold region in winter. The results showed that the effects of two light quality treatments on rice seedlings were similar; the responses of different rice varieties（strains） to light were different, but after increasing light intensity, the leaf age of rice seedlings accelerated, the number of roots increased, the base stem width, shoot dry weight, root dry weight and the seedling index increased. Strong seedling could be cultivated by appropriate increase of light intensity. Compared with the control, the quality of rice seedlings was poor when the intensity was about 1700 lx; when the intensity was about 3500 lx, the quality of rice seedlings was similar; when the intensity was about 5300 lx, the quality of rice seedlings was significantly improved.

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Identification Method and Application of Rice Proteome Electrophoresis 2020, 26(2): 19-22.  DOI: 10.3969/j.issn.1006-8082.2020.02.005 Abstract ( )   PDF (835KB) ( )   Protein content is closely related to taste quality of rice. Recent studies revealed that great differences in taste evaluation scores exist among some rice varieties with similar apparent protein content. This is likely related to their protein composition to a certain extent. Based on the previous studies, the extraction agent, sample size, fixation and dyeing of protein were optimized. Two  electrophoresis methods for rice protein were established including albumin electrophoresis and gluten electrophoresis. Spectral band analysis of rice through improved glutenin electrophoresis indicated that no difference in spectral bands was exist between rice varieties with similar protein content and different sensory scores. Differences were observed in spectral band  between Northern japonica rice and Southern japonica rice. It was found that for japonica rice from different sources, a loss or enhancement of band indensity at 70-105 kDa with similar protein content, whereas different sensory evaluation scores by using improved spectral band analysis of gluten electrophoresis method. It was preliminary confirmed that 105 kDa is a band associated with rice sensory quality. The denser the band, the better the taste quality of rice.

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Analysis of the Genotype and Environment Interactions as Well as the Correlation Research of Main Taste Quality in Rice 2020, 26(2): 23-26.  DOI: 10.3969/j.issn.1006-8082.2020.02.006 Abstract ( )   PDF (486KB) ( )   In order to investigate the effects of genotype, environment and genotype interaction with the environment on the gelatinization temperature and amylose content, an experiment was conducted using twenty-four indica hybrid rice varieties in three regional trial spots of the middle and lower reaches of Yangtze River as experimental materials. The results showed that the genotypic and environmental differences of gelatinization temperature and amylose content were extremely significant, and the genotype effect was greater than the environment and interaction between genotype and environment. The authors also analyzed the relationship between gelatinization temperature as well as amylose content and other quality traits. Correlation analysis results showed that gelatinization temperature was significantly negatively correlated with transparency and negatively correlated with amylose content. Amylose content was significantly positively correlated with chalkiness degree and chalky rice rate.

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Physicochemical Characteristics and Effect Analysis of Organic-inorganic Granular Fertilizer by Rice and Wheat Straw 2020, 26(2): 27-31.  DOI: 10.3969/j.issn.1006-8082.2020.02.007 Abstract ( )   PDF (669KB) ( )   The straw-mixed granular fertilizer was made by blending the fresh straw of rice （Oryza Sativa L.） and wheat （Triticum aestivum L.） with nitrogen, phosphorus and potassium nutrients by stir chopping and template rolling. A field experiment was carried out to test the fertilizer’s application effect on Nei 5 you 8015 and Yangmai 20. The results showed that, the physicochemical properties of the straw granular fertilizer, such as organic matter content, nitrogen, phosphorus and potassium content, pH value, granularity, compressive strength, swelling rate and water retention rate, met or exceeded the relevant National Standards. Under base applying the straw granular fertilizer and topdressing nitrogen fertilizer at tillering stage, the yields of Yangmai 20 and Nei 5 you 8015 were the same as those of the high-yielding fertilizer application. The partial productivity of N and P2O5 increased significantly in Yangmai 20 and Nei 5 you 5015, but the K2O was different.

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Impacts of Organic-Inorganic Fertilizer Application on Yield of Rice and Soil Properties in the Waterlogged Paddy Field 2020, 26(2): 32-35.  DOI: 10.3969/j.issn.1006-8082.2020.02.008 Abstract ( )   PDF (585KB) ( )   Background on fertilizer reduction, it is significant to comprehensive evaluate the effects of organic-inorganic fertilizer application on yield of rice and soil properties in the waterlogged paddy field. The changes of rice yield, nitrogen utilization and soil fertility of five different treatments（CK, no N; T1, apply N, P and K chemical fertilizers alone; T2, 30% organic manure and 70% chemical fertilizers; T3, 50% organic manure and 50% chemical fertilizers; T4, 100% organic manure） were compared under the same nitrogen content substitution. The results showed that  the yield of rice of organic manure application combined with chemical fertilizers treatments increased by 17.29%～31.43% compared with CK. Among them, T2 treatment had the highest yield, and significantly improved nitrogen recovery efficiency（NRE）, nitrogen agronomic efficiency（NAE） and nitrogen partial factor productivity（PFPN）. Organic manure application combined with chemical fertilizers could inprove the organic matter and the fertility of fertilizers. The appropriate fertilization method in waterlogged paddy field is 30% organic manure +70% chemical fertilizers, which can stabilize rice yield and reduce cost, and can improve nitrogen recovery efficiency and reduce the adverse effect on the farmland environment.

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Selection of High Yield Rice Varieties under Lower Nitrogen and Phosphorus Application 2020, 26(2): 36-40.  DOI: 10.3969/j.issn.1006-8082.2020.02.009 Abstract ( )   PDF (571KB) ( )   In order to select high yield rice cultivars for under lower nitrogen and phosphorus application, 12 hybrid varieties bred by Guizhou Rice Research Institute in recent years were used as materials, with Fyou 498 and Yixiangyou 2115 under normal fertilization conditions as control, different nitrogen reduction treatments and phosphorus reduction treatments were carried out. The results showed that the yields of Chengyou 981, Chengyou 33, Shanyou 108, D44/QR35 and Chengyou 489 under the decreased nitrogen condition were higher than the CK, the average yield was increased by 3.97%, that means the five cultivars could obtain high yield with lower nitrogen application. Shanyou108 and D44/QR35 performed higher yields under lower phosphorus application compared with the CK, the average yield was increased by 3.20%, that means the two cultivars could obtain high yield with lower phosphorus application. Generally, the type of rice cultivars with high yield under lower fertilizer application had more spikelets per panicle and larger population spikelets.

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Identification and Screening of High Flavonoid Rice Variety Resources 2020, 26(2): 41-43.  DOI: 10.3969/j.issn.1006-8082.2020.02.010 Abstract ( )   PDF (472KB) ( )   Flavonoids are important functional components in traditional Chinese medicine. It has strong anti-oxidation effect, eliminate free radicals in vivo, improve immunity, and has the effects of lowering blood sugar, blood lipids, blood pressure and anti-inflammatory. At present, there are few studies on flavonoids in rice, and screening for high-flavonoid resources is rarely involved. The main flavonoids in rice are anthocyanins and proanthocyanidins, the former mostly exist in black rice, and the latter mostly in red rice. The WARD method of systematic clustering was used to analyze the variance of flavone content of 985 rice resources under various classification schemes. The flavone content was divided into four categories: high flavone, higher flavone, medium flavone and low flavone. There were four varieties with high flavone content. The high content of flavonoids could significantly reduce the protein content of rice, increase the chalkiness degree, but had a small impact on other indicators. Combining excellent resources with high flavonoid rice breeding, could comprehensively improve the flavone content of general color rice, provide ideal dietary materials for diabetic patients and patients with three high levels, liver dysfunction and low immunity.

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Effects of Salt Stress on Quality Traits of Japonica Rice 2020, 26(2): 44-48.  DOI: 10.3969/j.issn.1006-8082.2020.02.011 Abstract ( )   PDF (644KB) ( )   An experiment was carried out to study the effects of salt stress on processing quality, appearance quality, nutritional quality, starch viscosity spectrum characteristic value and taste quality of different rice varieties, under different levels of soil salt content （S0, 0 g/kg; S1, 1.5 g/kg; S2, 3.0 g/kg; S3, 4.5 g/kg; S4, 6.0 g/kg） , using Changnonggeng 8 and Nangeng 9108 as materials. The results indicated that brown rice rate and milled rice rate decreased gradually with the increase of salt stress intensity, and head milled rice rate showed V-shape change. Salt stress had no significant effect on chalkiness degree and transparency, but chalky rice rate decreased significantly under strong stress treatment（S4）. With the increase of salt stress level, the RVA profile characteristic values did not increase or decrease linearly, but showed the V-type changes （peak viscosity, hot viscosity and breakdown viscosity） or inverted V-type changes（setback viscosity, consistence viscosity and gelatinization temperature）, the lowest or highest values appeared at S2 treatment. The effects of salt stress and interaction effects on taste value and related parameters were significant or very significant, but the effects of varieties were not significant. With the increase of salt stress, the taste value and related parameters of rice showed the V-type changes （taste value, appearance, viscousness and balance degree） and inverted V-type change（hardness）. Correlation analysis demonstrated that rice taste value was significant or extremely significant positive correlated with peak viscosity, trough viscosity and breakdown, and significant negative correlated with brown rice rate, protein content, setback viscosity, consistence viscosity and gelatinization temperature.

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Study on in Vitro Culture of Young Shoots of Oryza officinalis Wall. in Yunnan 2020, 26(2): 49-53.  DOI: 10.3969/j.issn.1006-8082.2020.02.012 Abstract ( )   PDF (633KB) ( )   Because of its low seed setting rate and strong granulation, it is difficult to use seeds to preserve and reproduce Oryza offcinalis. To effectively utilize its qualified characteristics of Oryza offcinalis in further rice breeding, the tissue culture and rapid propagation system of Oryza offcinalis was established by using the panicle as explants. The effects of various plant grouth regulators combinations on callus induction, differentiation and rooting were studied. The results showed that the optimal medium for induction of panicles of Oryza offcinalis was N6+2.0 mg/L 2,4-D + 2.8 g/L plant gel + 30.0 g/L sucrose. The optimal differentiation medium was N6 + 0.3 mg/L 6-BA + 0.3 mg/L NAA + 2.0 mg/L ZT + 3.0 mg/L KT + 2.8 g/L plant gel + 30.0 g/L sucrose, and the best rooting medium was 1/2 N6 + 0.2 mg/L NAA + 2.8 g/L plant gel + 15.0 g/L g sucrose, the most suitable pH was 5.8. The results also revealed that higher callus induction rate was obtained when young panicles were pretreated at 4℃ and then precultured by alternating light and dark.

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Analysis on Pathogenicity Difference of Xanthomonas oryzae pv.oryzae from Japonica Rice in High Altitude Region in Yunnan Province 2020, 26(2): 54-59.  DOI: 10.3969/j.issn.1006-8082.2020.02.013 Abstract ( )   PDF (702KB) ( )   The present situation of rice bacterial blight in the high altitude japonica rice region of Yunnan province were more and more serious. In order to find out the pathogenicity difference of the pathogen Xanthomonas oryzae pv.oryzae（Xoo）and effective prevention and control of bacterial leaf blight. 15 Xoo different varieties were used to analyze the difference in pathogenicity and resistance of the 32 strains collected from 11 rice varieties with the altitude over 1 800 m. The results indicated that pathogenicity of CX28-3 and CX30-1 from Chuxiong county were the most toxic, with the pathogenicity rate of 73.33%. The percentage of pathogenicity of JC12-2 was 0, which is the weakest. In the high altitude japonica rice area, the pathogenicity differentiation of Xoo isolates were not related to the altitude of the collected sites, but it was related to the geographical distance and the planting area of rice of collected isolates. There is no correlation among the pathotype frequency of Xoo isolates and altitude, except latitude and longitude of collected sites, and planting area of rice of the collected Xoo isolates. The rice varieties included Haonuoyang, IRBB14（Xa14）, IRBB4（Xa4） had high resistance to all the 32 strains. The resistance genes of them were worth of utilization and extension in Yunnan. In particular, Haonuoyang carris the new resistance gene, we should strengthen its localization and cloning in order to provide a new source of resistance.

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Talking about Field Planting Identification of Jiangsu Hybrid Rice Seed Purity in Hainan 2020, 26(2): 60-62.  DOI: 10.3969/j.issn.1006-8082.2020.02.014 Abstract ( )   PDF (441KB) ( )   Purity identification of field planting in Hainan （PIFPHN） is the most commonly used method for purity identification stipulated by national standards, which is of great significance to ensure the safety of hybrid rice seed production. This paper not only reviewed the history of hybrid rice PIFPHN of Jiangsu province, but also expounded the present situation, achievements, weaknesses and key measures of PIFPHN, and discussed the future development trend of hybrid rice PIFPHN of Jiangsu province .

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Analysis on Characteristics of Rice Varieties Registered by Henan Province from 2001 to 2018 2020, 26(2): 63-68.  DOI: 10.3969/j.issn.1006-8082.2020.02.15 Abstract ( )   PDF (584KB) ( )   In this study, the author analyzed the characteristics of rice varieties registered by Henan province from 2001 to 2018. 132 rice varieties, including 77 indica rice, 54 japonica rice, 1 indica-japonica hybrid rice; the percentage of rice varieties bred by seed enterprises was rapid increased. The yield analysis showed a significant rising trend, the average yield of japonica hybrid rice and two lines indica hybrid rice were higher than other variety types. The high quality compliance rate of 132 rice varieties was 46.21%; the chalky rice rate and chalkiness degree were poor, these were the main factors restrict the improvement of rice quality in Henan province．

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Effects of Cultivation Patterns on Yield, Quality and Benefit of High-quality Rice Variety Nangeng 9108 2020, 26(2): 69-72.  DOI: 10.3969/j.issn.1006-8082.2020.02.016 Abstract ( )   PDF (525KB) ( )   Using Nanjing 9108 as a test material, the effects of different rice cultivation patterns on the yield, quality and benefit of high-quality rice variety were studied. The results showed that the actual yields from high to low were pot seedling machine transplanting, blanket seedling machine transplanting, rice-duck farming system, and rice- crayfish farming system. The whole milled rice rate were rice-duck farming system > rice-crayfish farming system > seedling machine transplanting > blanket seedling machine transplanting. The chalky rice rate and chalkiness of seedling machine transplanting was the highest, and rice-duck farming system was the lowest. The appearance quality of rice in rice comprehensive planting mode was better. The rice comprehensive planting mode not only reduced the protein content and amylose content, but also increased the gel consistency, and its RVA profile showed a decrease in the setback and the a increase in breakdown value, which improved the cooking and eating quality of Nangeng 9108. The economic benefits from high to low were rice-crayfish farming system, rice-duck farming system, pot seedling machine transplanting and blanket seedling machine transplanting. The economic benefit of comprehensive planting and breeding mode were significantly higher than that of traditional single rice mode.

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Study on the Matching Technique of Agricultural Machinery and Agronomy for Transplanting Rice with Sparse Seeding and Long Seedling Age by Carpet Seedling Raising 2020, 26(2): 73-76.  DOI: 10.3969/j.issn.1006-8082.2020.02.017 Abstract ( )   PDF (561KB) ( )    In order to find out the improved technology for increasing the area of taking seedling for blanket seedling transplanter and the suitable seeding amount, seedling age and seedling raising trays for the long seedling age under this technology, and to form the matching technology of agricultural machinery and agronomy for the long seedling age with blanket seedling machine transplanting. The results showed that compared with pot seedling transplanting rice, with the improved technology, the yield of hybrid rice was basically equivalent, while the yield of conventional rice could be increased by 4.74%~6.83%. When the seedling age of machine-transplanted within 30 days, the seedling age and yield have a positive correlation. When the sowing rate reached 80 g/plate, the rice yield was the highest when the seedling age reached 30 days. Compared with ordinary plastic trays, the large bowl-shaped carpet degradable tray have better water permeability and air permeability, the seedling roots carrying soil, the seedlings have better quality and lighter injury, and the slow seedling period of rice was shorter.

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Breeding and Characteristics of Angengyou 1, a Specific Hybrid Rice Cultivar for Planting in Fish Pond 2020, 26(2): 77-79.  DOI: 10.3969/j.issn.1006-8082.2020.02.018 Abstract ( )   PDF (410KB) ( )   In order to increase comprehensive economic and ecological benefit of fish-rice coculture and exploit new approach for rice planting and production, a new hybrid rice cultivar Angengyou 1, which is the first specific rice cultivar for planting in fish pond, was bred and officially released in Zhejiang. Angengyou 1 has the characteristics with high and giant plant phenotype, thick and strong stalks, well-developed aquatic roots with internode, and strong lodging resistance. The breeding process, characteristics and high yielding cultivation techniques of Angengyou 1 were briefly introduced in the paper.

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Effects of Sowing Date on Quality of Main Rice Varieties in Sanjiang Plain 2020, 26(2): 80-83.  DOI: 10.3969/j.issn.1006-8082.2020.02.019 Abstract ( )   PDF (481KB) ( )   Through sowing date test, the rice quality characters of five main cultivars in Sanjiang Plain were analyzed. The results showed that, the sowing date had effect on head milled rice rate, chalky rice rate, chalkiness degree, amylose content, protein content and taste value, but had little effect on brown rice rate and milled rice rate. With the delay of sowing date, the head rice rate decreased and the appearance quality deteriorated, and there was a significant negative correlation between them; the amylose content increased, while the protein content decreased; the change of taste value varied with varieties. Cluster analysis of coefficients of variation of quality traits showed that chalky rice rate and chalkiness degree were most affected by sowing date and belonged to sensitive traits; brown rice rate, milled rice rate, taste value, amylose content and protein content were less affected by sowing date and belonged to slow traits; and head rice rate was affected by sowing date was between the two. Generally speaking, early sowing had a positive effect on the overall quality improvement of the five rice varieties, but from the point of taste value, late sowing of early-maturing varieties Longgeng 31 and Longgeng 46 might be more beneficial to the improvement of taste.

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Effects of Sowing Date and Seedling Nursery Methods on Seedling Quality and Yield of Xinrongyou 6307 2020, 26(2): 84-87.  DOI: 10.3969/j.issn.1006-8082.2020.02.020 Abstract ( )   PDF (523KB) ( )    In order to explore the effects of sowing date and seedling nursery methods on seedling quality and yield of rice, an experiment was conducted, using early maturing hybrid rice variety Xinrongyou 6307 as material, two different seedling raising methods of geothermy dry nursery seedling in the greenhouse and mulch film with bamboo dry nursery seedling in the field were used, and four different sowing dates were set. The results showed that the treatment of geothermy dry nursery seedling in the greenhouse with sowing on March 15th has good seedling quality and high yield, and harvested 5 days earlier than the treatment of mulch film with bamboo dry nursery seedling in the field under the same sowing date. These results could provide theoretical basis and technical reference for high yield and high efficiency cultivation of rice.

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Effects of Uniconazole Spraying Method on Rice Seedling Quality of Matrix Seedlings Raising 2020, 26(2): 88-90.  DOI: 10.3969/j.issn.1006-8082.2020.0 Abstract ( )   PDF (417KB) ( )   In order to search the reasonable rice seedling control method, an experiment was conducted to study the effects of different methods of spraying unicoazole on plant height, chlorophyll content, root length, root number and root activity, four uniconazole level （C0, 0 mL/L; C1, 25 mL/L; C2,50 mL/L; C3, 100 mL/L） and three spraying time （T0, 0 d seedling age; T1, 5 d seedling age; T2, 10 d seedling age） were set up, using Huayou 2 as material. The results showed that the spray of uniconazole significantly reduced the plant height of the seedlings, the higher the spray concentration, the better the seedling control effect. The control effects of seedlings were weakened when spraying time was delayed. The high concentration of uniconazole reduces the chlorophyll content of the seedlings. Spraying Uniconazole significantly increased the root length, root number and root activity. But if the concentration is too high, it will restrain the growth of roots. According to the plant height, chlorophyll content, root length, root number and root activity, the treatment of T1C2 was the best for improving the quality of the seedlings.

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Effects of Different Nitrogen Application Rates and Densities on Yield and Population Structure of Yongyou 1540 2020, 26(2): 91-93.  DOI: 10.3969/j.issn.1006-8082.2020.02.022 Abstract ( )   PDF (310KB) ( )    Yongyou 1540 is the main variety of single-season rice in southwest Zhejiang province in recent years. The results of different nitrogen application rates and planting densities showed that the nitrogen fertilizer requirement of Yongyou 1540 is large, and the application of enough nitrogen fertilizer is the key to increase yield. Under the same fertilizer application rate, the effect of different planting densities on yield was not significant, but the nitrogen fertilizer application rate had a very significant effect on the yield. In production, under the premise of applying enough phosphorus and potassium in vegetable-rice rotation field, the suitable pure nitrogen was 105 kg/hm2, and planting density was 185 000 /hm2.

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Application Effects and Technical Points of the Zero-day Chemical Weeding Technology in Machine Transplanting Rice 2020, 26(2): 94-95.  DOI: 10.3969/j.issn.1006-8082.2020.02.023 Abstract ( )   PDF (247KB) ( )    In order to study the applicability of the zero-day chemical weeding technology in  machine-transplanted rice, a comparative experiment was carried out between the high-speed rice transplanter with zero-day chemical weeding technology and the conventional rice transplanter. On the basis of grain production estimate and production cost accounting, the economic benefits of the technology were analyzed. After accounting, under the same production conditions, the zero-day chemical weeding technology increased the grain yield by 5.8% and the income by 84.69 yuan/667 m2. The test results showed that the zero-day chemical weeding technology reduced the frequency of employing pesticide, improved the weeding efficiency meanwhile promoting the mechanization of rice production. It was an efficiency, labor-saving and cost-saving production technology.

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Discussion on the Technology of Rice Yield of 15 t/hm2 in Single Season 2020, 26(2): 96-98.  DOI: 10.3969/j.issn.1006-8082.2020.02.024 Abstract ( )   PDF (444KB) ( )    In view of the fact that the rice yield of 15 t/hm2 in single season is not easy to obtain and has poor repeatability. Comprehensive summary the reflection, the key to the problem lies in not paying enough attention to cultivation farmland soil of high yield and the regulation of rice plant type. Based on this, the author proposed “tripod stands” super high-yield cultivation technology: selecting partial japonica varieties with super large ears, strong fertilizer resistance and lodging resistance, and the vegetative growth is not easy to overgrow, the yield potential of 15 t/hm2 under local ecological conditions; cultivating farmland with high-level supply coordination of water, fertilizer, gas and heat, and the basic grain yield is above 10 t/hm2; adopting the“tripod stands” super high yield plant type cultivation which could control the excessive growth of nutrients as a breakthrough. The principled techniques were discussed in this paper.

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High-yielding Seed Production Technology of Super Hybrid rice Huazheyou 1 2020, 26(2): 99-100.  DOI: 10.3969/j.issn.1006-8082.2020.02.025 Abstract ( )   PDF (275KB) ( )   The super hybrid rice variety Huazheyou 1 was jointly bred by China National Rice Research Institute and Zhejiang Wuwangnong Seeds Shareholding Co. Ltd, which has been listed as the leading variety in Zhejiang province in 2019. It is characterized as stronger stem, lodging resistance and fertilizer tolerance, high and stable yield, as well as good grain quality. According to the performances of sterile line Huazhe A and restorer line H570, combined with local meteorological conditions in Suichang county, Zhejiang province, the author explored the high-yielding seed production techniques of Huazheyou 1 adopted to the southwestern mountainous area of Zhejiang province.

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Comparative Study on Different Fine Quality Rice Varieties in Yangfengshan Area, Xianju County 2020, 26(2): 101-103.  DOI: 10.3969/j.issn.1006-8082.2020.02.026 Abstract ( )   PDF (353KB) ( )    In order to screen out the fine quality and high yield rice suitable for cultivation in Yangfengshan area of Xianju county, 11 indica hybrid rice and 3 indica-japonica rice were introduced. The comparative experiment of varieties was carried out in Yangfengshan village. The results showed that Zhong 64 Youhuazhan had obvious yield advantage and good comprehensive performance, which could be used as an alternative variety for  large-scale cultivation, and Taoyouxiangzhan had excellent quality and moderate yield, which could be used in the order production of high-grade rice.

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Analysis of Current Situation of Rice Industry in Heilongjiang Province and Its Future Development Ideas 2020, 26(2): 104-106.  DOI: 10.3969/j.issn.1006-8082.2020.02.027 Abstract ( )   PDF (443KB) ( )   The status quo of rice industry in Heilongjiang province was summarized, and corresponding countermeasures were put forward for the problems in rice production in Heilongjiang province. The specific countermeasures are as follows: breeding new high-quality, stress-resistant rice varieties suitable for different ecological regions, and research on simple and efficient techniques for new varieties; research on key technology integration and application of direct seeded rice, and straw returning technology; research on rice deep processing technology.

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Thoughts and Suggestions on the Development of Ratoon Rice in Dazhou City 2020, 26(2): 107-110.  DOI: 10.3969/j.issn.1006-8082.2020.02.028 Abstract ( )   PDF (590KB) ( )    In this paper, the feasibility and potential of developing ratoon rice in Dazhou city were analyzed, and the effects of variety selection, stubble height, fertilizer operation, water management and chemical regulation on the yield and rice quality of ratoon rice were reviewed. Combined with the actual situation of ratoon rice area in Dazhou city, the high yield cultivation techniques of ratoon rice were summarized, and some suggestions for the development of ratoon rice in Dazhou city were put forward.