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20 May 2020, Volume 26 Issue 3 Previous Issue    Next Issue

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Development Status and Suggestions of Super Rice in China 2020, 26(3): 1-4.  DOI: 10.3969/j.issn.1006-8082.2020.03.001 Abstract ( )   PDF (541KB) ( )   At present, the food security problem in China is still serious, and developing super rice is still of great significance. The development of super rice is an effective measure to stabilize grain productivity and achieve both high quality and high yield under the structural reduction of rice area in China. In the 23 years of the development of super rice in China, new technologies have been constantly broken through, new varieties have been introduced, new records have emerged, new models have been created and new benefits have emerged. In the next step of research and promotion of super rice, efforts should be made to confirm super rice varieties, improve super high yield, improve rice quality and upgrade cultivation techniques.

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Study on the Influencing Factors of Identification of Indica and Japonica Rice by Phenol Reaction 2020, 26(3): 5-9.  DOI: 10.3969/j.issn.1006-8082.2020.03.002 Abstract ( )   PDF (751KB) ( )   The phenol reaction was applied to identify the type of indica or japonica rice, and the related factors affecting the phenol reaction were also explored in detail to improve the operability. The results showed that soaking time, rice form and the concentration of phenol solution have important effects on the phenol reaction. In order to improve the operability of the phenol reaction and ensure the accuracy of the results, it is preferred to soak the grain or brown rice with an aqueous solution of phenol in a concentration of 0.20% or more, and soak for at least 72 h. The phenol reaction is simple to operate and the color change is easy to observe, so it has practical value in the rapid identification of indica and japonica rice.

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Cause Analysis and Control Measures of Large-area Rotten Seedling Caused by Spring Cold in Early Rice 2020, 26(3): 10-12.  DOI: 10.3969/j.issn.1006-8082.2020.03.003 Abstract ( )   PDF (355KB) ( )   In 2020, early rice was affected by cold in late spring, and large areas of serious rotten seedlings appeared in Zhejiang. Several investigation sites found that direct seeding rice is particularly serious, and the part of machine transplanting seedlings also died of seedlings due to low temperature and cold injury. Meteorological data analysis showed that, the average temperature in each ten-day of March 2020 was higher than that of previous years, and the temperature in early April was lower than that of previous years. The main reason for the phenomenon of large-scale rotten seed and dead seedlings, first, the late spring coldness temperatures on the 28-31 of late March are low and the daily temperature difference is small. The second, the temperature is high in the early March, mid-March and early late-March, low in the late period, and the temperature changes in the early and late periods are large. Early rice direct seeding prematurely, and the risk of temperature is high. Some early rice seedlings are not properly managed for seeding and seedlings, and the quality of substrates for mechanical transplanting seedlings and insulation equipment are not in place. In view of the existing problems and causes, the countermeasures of early rice to prevent dead seedlings from falling into the cold and rotten in the spring are proposed.

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Sucrose Alleviates Inhibition on the Kernel Weight and Assimilation Distribution Caused by Heat Stress at Grain Filling Stage of Rice 2020, 26(3): 13-17.  DOI: 10.3969/j.issn.1006-8082.2020.03.004 Abstract ( )   PDF (758KB) ( )   A indica rice Zhefu 802 and its near-isogenic line fgl were subjected to high temperature conditions at 40℃/30℃ （day/night） for 10 d at grain filling stage. The rice plants was sprayed with 2.5% sucrose before heat stress imposed. The results indicated that heat stress at grain filling stage had less effect on seed setting rate, but reduced the kernel weight in both rice varieties significantly, which accompanied with lower ratio between panicle dry weight and total dry weight, rather than the dry matter weight accumulation. Rice plants treated with sucrose attained significantly higher kernel weight than that of H2O treatment under heat stress in both rice varieties. Similarly, the ratio between the panicle dry matter and total plant dry matter of the sucrose treatment was significantly higher than those of plants treated with H2O under heat stress. This suggested that sucrose could alleviate the damages on the kernel weight and assimilate distribution by heat stress at grain filling stage.

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Effects of Florigen RFT1 for Promoting Flowering in Rice 2020, 26(3): 18-22.  DOI: 10.3969/j.issn.1006-8082.2020.03.005 Abstract ( )   PDF (670KB) ( )   Shortening the growth period of early-season rice varieties is one of the important breeding objectives in the double-season rice region in southern China. In this study, near isogenic lines （NILs） and NIL-F2 populations that segregated the florigen gene RFT1 in the early-heading genetic background were developed using early-season rice variety Zhenshan 97 and middle-season rice variety Miyang 46 as the parents. The populations were tested for heading date and yield traits under natural long-day conditions. The results showed that the Miyang 46 allele of RFT1 could promote heading date and had a slight negative effect on yield traits. The additive effects on heading date ranged from 0.84 to 1.21 days for heading date, explaining 10.46% to 18.62% of the phenotypic variances. The additive effects estimated in two-year's trials using the NIL population were 3.06 and 2.02 for the number of spikelets per panicle, 2.98 and 1.48 for the number of grains per panicle, 0.12 g and 0.08 g for 1 000-grain weight, and 0.63 g and 0.38 g for grain yield per plant, with the phenotypic variances explained ranging from 0.99% to 2.76%. Our results indicated that the Miyang 46 allele of RFT1 could further shorten the growth period of early-season varieties with slight penalty in grain yield, providing more abundant growth time for late-season rice which could increase the production potential of double-season rice.

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Impacts and Solutions of COVID-19 Epidemic on Rice Industry in Hubei Province 2020, 26(3): 23-27.  DOI: 10.3969/j.issn.1006-8082.2020.03.006 Abstract ( )   PDF (704KB) ( )   Hubei province is the most serious area of COVID-19 epidemic, and also the main rice producing area in China. It is very important to stabilize the rice production area and yield in Hubei province for ensuring food security, increasing farmers' income and agricultural efficiency. Thus, this study analyzed and estimated the impacts of the epidemic on the planting area, agricultural material supply, production employment, rice processing, crayfish–rice industry and agricultural technology services through the questionnaire investigation of 402 different types of practitioners, and put forward five countermeasures, such as adjusting the production plan, allocating agricultural material supply, playing the role of agricultural machinery, optimizing the planting structure and implementing technical guidance.

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Effects of Salicylic Acid and Diniconazole Combination on the Cold Tolerance of Rice Seedlings 2020, 26(3): 28-31.  DOI: 10.3969/j.issn.1006-8082.2020.03.007 Abstract ( )   PDF (586KB) ( )   The early rice variety Zhongjiazao 17 was selected in this study to investigate the effects of salicylic acid （SA） and diniconazole （S08） combination on cold tolerance of rice plants at the seedling stage under the artificial climate chamber and field conditions. The results indicated that cold stress adversely damaged the rice seedlings, but such effect could be relieved when treated with SA+S08. Under cold stress, lower decrease in maximum fluorescence quantum efficiency（Fv/Fm） and the actual fluorescence quantum efficiency [Y（II）] of leaves was found in the SA+S08 treatment than those in H2O treatment. Accordingly, lower increase in contents of MDA and H2O2 was found in the former than the latter under cold stress compared with their respective controls under natural conditions. In contrast, larger increase in activities of SOD and CAT as well as soluble content was showed in plants treated with SA+S08 than those treated with H2O. Under filed conditions, the plant height of rice seedlings treated with SA+S08 decreased slightly compared with those plants treated with H2O. However, the dry matter weight in the former was higher than the latter. Therefore, we concluded that application of SA+S08 could enhance the antioxidant capacity of rice leaves to reduce oxidant stress caused by cold stress.

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Breeding of Ideal Plant Type for Semi- curved Heavy Panicle and Large Grain Japonica Rice 2020, 26(3): 32-33.  DOI: 10.3969/j.issn.1006-8082.2020.03.008 Abstract ( )   PDF (382KB) ( )   Aiming at the problems of curved panicle type rice and erect panicle type rice, the breeding technical route of semi-curved japonica rice with heavy spikes and large grains was determined. With the technical route, we have bred the japonica rice variety Jinyuan 89 with fine quality, stress resistant and high yield, which possessed the advantages of erect panicle type and curved panicle type. This variety has the characteristics of strong root systems, high rate of light energy utilization, leaves erect, lodging resistance, large ear and grouting fast, solved the technical problems of rice quality, stress resistance and super high yield that difficult to take into account. The yield of the general production field is about 800 kg/667 m2, the yield of the demonstration field is about 930 kg/667 m2, and the yield of the heavier-saline field is 700~760 kg/667 m2. The semi- curved heavy panicle and large grain japonica rice has the characteristics of strong heredity and fast stability of breeding, which innovated japonica rice breeding technology system and linked germplasm resources with excellent traits, and achieved a new breakthrough in breeding ideal plant type of japonica rice.

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Identification of Broad-spectrum Resources against Rice Bacterial Blight from Oryza meyeriana 2020, 26(3): 34-42.  DOI: 10.3969/j.issn.1006-8082.2020.03.009 Abstract ( )   PDF (889KB) ( )   Bacterial blight is one of the major rice diseases. Relevant studies showed that Oryza meyeriana has high resistance and even immune to bacterial blight. In order to explore the resistance of Oryza meyeriana on the different pathogens, 36 representative materials were evaluated by inoculating with 24 bacterial blight bacteria lines collected from China and abroad. The results showed that most of the tested materials showed typical symptoms of bacterial blight, and the lesions were brown spots with a lesion length of 0.00~0.30 cm. The overall resistance level of the tested materials was good, 44.44% of the materials reached high resistance and even immune level to 24 strains. Among them, OM2-1 is the best in both resistance and resistance spectrum. In terms of population, the resistance phenotype of other populations except Jinghong Jingne and Menghai Mengwang reached high resistance and even immunity, especially the population of Gengma Mengding had the best resistance. Furthermore, most of the tested materials had high heterozygosity, and the resistance of different materials in the same population to bacterial blight varied greatly.

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Effects of different Selenium Fertilizers on Selenium Concentration and Form in Various Rice Grains 2020, 26(3): 43-47.  DOI: 10.3969/j.issn.1006-8082.2020.03.010 Abstract ( )   PDF (814KB) ( )   In order to determine the effective application of selenium fertilizer, as well as to select the high-quality rice varieties with strong selenium-enriching ability, two different fertilization methods were employed to measure selenium concentrations and forms in different cultivars. The results showed that application selenium fertilizer could significantly increase the selenium content in rice, there were interactions between fertilization methods and varieties, fertilization concentration and varieties; the selenium content in most cultivars after selenium treatment reached the national standard for selenium-rich rice. Different varieties had different selenium enrichment capabilities, Yanggeng 805 and Nangeng 5055 showed strong selenium-rich ability, and in the condition of high concentration treatment, the selenium content of brown rice reached 316.45 μg/kg and 286.82 μg/kg, respectively. There was no significant difference in selenium content between polished rice and brown rice, which indicated that the selenium mainly accumulated in polished rice. The selenium morphology study found that no inorganic selenium was detected in the polished rice, but all organic selenium was detected in polished rice, organic selenium was mainly comprised by selenomethionine, and a small amount of selenocysteine and selenium methyl selenocysteine. The results provide some references for developing selenium enriched rice as well as investigating various selenium accumulation mechanism among rice varieties.

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Identification of Cold Tolerance of Middle-late Maturing Rice Varieties in Jilin Province 2020, 26(3): 48-53.  DOI: 10.3969/j.issn.1006-8082.2020.03.011 Abstract ( )   PDF (741KB) ( )   Chilling damage is one of the important factors causing rice yield reduction. The malondialdehyde （MDA）, chloroplast pigments contents, ascorbate peroxidase （APX） and glutathione peroxidase （GPX） activity of twenty one middle-late maturing rice varieties under different temperatures were determined using test box. The objective is to select the cultivars with higher cold tolerance in terms of the determined parameters, provide theoretical basis and production practice for the selection and breeding of cold-tolerant rice varieties in Jilin province. The results showed that, the MDA content of all tested rice varieties increased significantly after low temperature treatment. The chloroplast pigments of most varieties （lines） have an increasing trend, but not significant, it showed that chloroplast pigments of rice seedlings did not undergo significant damage under low temperature stress. Six varieties were selected and treated at low temperature, and their APX and GPX activities were significantly increased, it suggested that both played an important role in cold tolerance of rice. The correlation between MDA and chloroplast pigments, APX and GPX did not reach significant levels, and further research is needed. The identification results showed that Hongke 67, Tonghe 16-8037, Tongke 27, Hongke 87 and Huigeng 7 had strong cold tolerance and could be used as cold-resistant breeding parents. Five varieties including Jiyugeng, Tie 19, Bingshi 698, Jigeng 507 and Akita Komachi have weak cold tolerance.

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Analysis and Countermeasures for the Major Meteorological Disasters in Ratoon Rice Production in Southern Henan 2020, 26(3): 54-57.  DOI: 10.3969/j.issn.1006-8082.2020.03.012 Abstract ( )   PDF (627KB) ( )   The research and promotion of ratoon rice production in the Southern Henan area started late, but the development speed is fast. Severe weather is likely to cause large losses in local ratoon rice production, which greatly dampen famer’s enthusiasm. It is very important to study the laws of severe weather and put forward the cultivation measures for disaster prevention and avoidance. The study used the meteorological data from 1951 to 2018 Xinyang city, and statistically analyzed the time and intensity of major meteorological disasters in the past 10 years （2010—2018）. It is planned to find out the law of meteorological disasters in the Southern Henan area, and put forward countermeasures for disaster prevention and avoidance of ratoon rice production, which would provide the reference for the ratoon rice disaster prevention in South Henan area.

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Effects and Experience of Demonstration and Extension of Super Rice in Zhejiang Province 2020, 26(3): 58-60.  DOI: 10.3969/j.issn.1006-8082.2020.03.013 Abstract ( )   PDF (358KB) ( )   Zhejiang province has organized the demonstration and promotion of super rice since 2005. Through the innovation of cultivation technology and the improvement of the mechanism of demonstration and promotion, the application of green, high-yield and high-quality super rice varieties and techniques have been promoted, which has promoted the yield and income of rice in Zhejiang province. This paper summarized the practice and experience of demonstration and extension of super rice in recent years, and put forward some countermeasures and suggestions for the next step.

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High-yielding Cultivation Techniques of Super Hybrid Rice Xiangliangyou 900 with Yield 16.35 t/hm2 2020, 26(3): 61-63.  DOI: 10.3969/j.issn.1006-8082.2020.03.014 Abstract ( )   PDF (462KB) ( )   Xiangliangyou 900 is a two-line hybrid rice combination bred by Yuan Longping team. It has the characteristics of ideal plant type, developed root system, suitable growth duration, large panicles with plenty of spikelets, high seed setting rate and high and stable yield, etc. In 2009, the super-high yield cultivation demonstration was carried out in Dechang county, and the average yield was 16.35 t/hm2. In this paper, the characteristics of Xiangliangyou 900 were introduced and the high-yielding cultivation techniques with yield 16.35 t/hm2 were described in detail, including rational fertilization, scientific water management, pest and disease control, and proposed measures to increase the yield potential.

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High Yield Cultivation Techniques for Yongyou 12 as Single Cropping Late Rice with Yield of 15 t/hm2 2020, 26(3): 64-65.  DOI: 10.3969/j.issn.1006-8082.2020.03.015 Abstract ( )   PDF (293KB) ( )   Yongyou 12 is an indica-japonica hybrid rice with high yield, bred by Ningbo Academy of Agricultural Sciences. In 2018, it was planted as single-season late rice in Jiangshan city, Zhejiang province. It showed the characteristics of strong resistance, neat growth, large ears and high yield. The average yield in the large-scale （7.8 hm2） demonstration reaches 15.25 t/hm2. According to the practice of cultivation, the authors put forward the key points of high yielding cultivation techniques of Yongyou 12.

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Analysis of Missing Hill Rate and Uniformity of Seedlings Transplanted by Machine in Precious Drilling Sowing of Hybrid Rice 2020, 26(3): 66-68.  DOI: 10.3969/j.issn.1006-8082.2020.03.016 Abstract ( )   PDF (387KB) ( )   In this study, Zhongzheyou 1 and Yongyou 1540 were used to study the seed distribution, the rate of missing hill and the uniformity of seedlings with mechanical transplanting under drill sowing compared to broadcast sowing. The results showed that, the uniformity of seed distribution by drill sowing was 82.0% higher than that of broadcast sowing; drill sowing significantly reduced the rate of missing hill. The rates of missing hill of Zhongzheyou 1 and Yongyou 1540 by drill sowing were 76.2% and 85.5% lower than that of the broadcast sowing, respectively; the uniformity of seedlings with mechanical transplanting of Zhongzheyou 1 and Yongyou 1540 were increased by 53.5% and 46.5% by drill sowing than that of broadcast sowing. The study ascertained that seed drill sowing technology could solve the problem in hybrid rice machine transplanting with high missed hill rate and low uniformity of machine transplanting seedlings.

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Rice-Wheat Annual High Yield, Fine Quality and High Efficiency Cultivation Techniques in Jianghuai Hilly Area in Anhui Province 2020, 26(3): 69-72.  DOI: 10.3969/j.issn.1006-8082.2020.03.017 Abstract ( )   PDF (566KB) ( )   According to the characteristics of rice-wheat annual cropping system in Jianghuai hilly area, the authors studied the characteristics of optimal allocation of light, heat and precipitation resources and the principle of annual variety allocation, the key cultivation techniques and parameters, such as crop rotation connection between seasons, mechanized planting mode, high-yield and high-efficiency population construction, coupling optimization management of fertilizer and water, green prevention and control of diseases, pests and weeds. Finally, the high yield, fine quality and high efficiency cultivation technologyl of rice-wheat annual cropping system was established. The study could provide technical support for the large-scale rice-wheat annual production in Jianghuai hilly area.

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Technical Characteristics and Key Measures of Plant Protection of High-yield Organic Cultivation of Flooded Rice 2020, 26(3): 73-75.  DOI: 10.3969/j.issn.1006-8082.2020.03.018 Abstract ( )   PDF (455KB) ( )   In recent years, natural, pollution-free and high quality organic rice has gradually become popular in the market, and the potential for organic rice production and consumption is huge. Combining the ecological characteristics of Jiangnan area, the author has explored a new mode of organic rice planting—flooded organic cultivation. The mode has the characteristics of low incidence of diseased, insects and grass damage and high yield level. This paper focused on the technical characteristics and key techniques of plant protection of the flooded organic cultivation mode, in order to provide some references for the demonstration and popularization of suitable areas in southern Jiangsu and enrich the organic rice cultivation technology mode in China.

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Effects of Reduce Nitrogen Fertilizer Combined with Silicon Fertilizer on Grain Yield and Pests and Diseases of Rice 2020, 26(3): 76-80.  DOI: 10.3969/j.issn.1006-8082.2020.03.019 Abstract ( )   PDF (769KB) ( )   In order to explore the effects of applying silicon fertilizer on the yield and diseases and insect pests control of rice under reduced nitrogen fertilizer application, five different fertilization treatments were designed. The results showed that, compared with N300 treatment, the N240Si60 and N180Si60 treatments could improve the yield and economic benefits of rice. Under N240Si60 and N180Si60 treatments, the number of Cnaphalocrocis medinalis as well as the incidence and disease index of rice false smut were significantly decreased, moreover, the number of natural enemies was significantly increased.

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Effects of Harvesting Time on Quality Traits of High Quality Rice Variety Dalixiang 2020, 26(3): 81-83.  DOI: 10.3969/j.issn.1006-8082.2020.03.020 Abstract ( )   PDF (365KB) ( )   An experiment was conducted to study the effects of harvesting time on quality of high-quality rice variety Dalixiang. The results showed that the brown rice rate and polished rice rate increased gradually and then decreased with the delay of the harvesting time, the value reached the maximum when harvested at 51 days after full heading. Harvested at 37 days, 44 days and 51 days after full heading, the whole rice rate was no significant change, further delay in harvesting the whole rice rate was significantly reduced. The chalky grain rate and chalkiness degree showed an increasing trend with the delay of the harvesting time. The harvesting time has little effect on protein content and fatty acid content, but has greater effect on amylose content and taste value. Harvested at 58 days after full heading, the taste value of Dalixinang was the highest, BDV was the largest and SBV was the smallest.

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Analysis on Combining Ability of Yield Traits of Aromatic and High Quality Rice Cytoplasmic Male Sterile Line Dexiang 074A 2020, 26(3): 84-87.  DOI: 10.3969/j.issn.1006-8082.2020.03.021 Abstract ( )   PDF (419KB) ( )   In this study, according to North Carolina design II（NC II Design）, the aromatic cytoplasmic male sterile line Dexiang 074A and four other sterile lines （K22A, Gang 46A, II-32A and K17A） were used, crossed with five restorer lines, such as Minghui 63, Chenghui 727, Luhui H103, Luhui 8258 and Shuhui 527, respectively, constructing a double-row hybrid population, the combining ability of yield and relate traits were analyzed . Seven traits including yield per plant（YP）, effective panicles per plant （EP）, weight per panicle（WP）, spikelets per panicle（SP）, full grains per panicle（FGP）, seed setting rate（SSR） and 1 000-grain weight（TGW）. The results showed that Dexiang 074A was the most positive trait in the sterile line, there were 6 traits general combining ability effect value was positive, YP was 9.04, EP was 6.27, WP was 3.29, FGP was 0.15, SSR was1.40, TGW was 2.40. Among the 7 traits, TGW had the strongest heritability, and the broad heritability and narrow heritability was 94.69% and 80.69% respectively, which indicating that this trait is not susceptible to environmental changes.

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Breeding and Utilization of a New Medium Maturing Medium Japonica Rice Variety Nangeng 2728 with Good Eating Quality 2020, 26(3): 88-90.  DOI: 10.3969/j.issn.1006-8082.2020.03.022 Abstract ( )   PDF (400KB) ( )   Nangeng 2728 is a new japonica rice variety with good taste, developed from the cross between Nangeng 5055 and Wugeng 15 by Institute of Food Crops, Jiangsu Academy of Agricultural Sciences and Jiangsu Dafeng Huafeng Seed Industry Co. Ltd. Its outstanding advantages are good quality and amylose content of 10%. It was approved by Jiangsu provincial Variety Approval Committee in 2018 and suitable for planting in Huaibei area of Jiangsu province. This article introduced its breeding process, characteristics and key cultivation techniques.

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Study on Issue and Solution of Rice Seed Mechanical Drying in Zhejiang Province 2020, 26(3): 91-95.  DOI: 10.3969/j.issn.1006-8082.2020.03.023 Abstract ( )   PDF (621KB) ( )   Rice seed quality is crucial for rice production. In the process of rice seed production, the drying of rice seeds is one of the important links in the overall control of seed quality, the problems that occur in mechanical drying are the important factors affecting the quality of rice seeds. Therefore, a comprehensively analysis on the problems and solutions of rice seed mechanical drying in Zhejiang province was conducted after interviewing 19 major rice seed enterprises in Zhejiang province. Among the 19 seed enterprises, 12 seed enterprises had seed quality problems due to mechanical drying problems in the past five years. The damage of drying equipment, operator errors and drying parameter settings are important reasons for the accidents of rice seed mechanical drying quality. The“Sanjiu” and“Golden” grain dryers were the most widely used drying equipments in Zhejiang province, and also be considered to be the ideal drying equipments for rice seed mechanical drying. The mechanical drying with high-temperature in high moisture rice seeds were liable to induce seed quality damage. Two-stage or multi-stage drying method was the ideal method for mechanical drying of high-raw water rice seeds. Futhermore, according to the problems of mechanical drying in rice seeds, this study proposed some solutions in the aspects of policy guidance, development of mechanical drying equipment, improving mechanical drying capacity and strengthen theoretical research on mechanical drying. This study would provide theoretical and practical guidance for promoting the development of rice seed mechanical drying and the safety production for rice seeds.

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Research on Key Techniques of Rice Mechanical Harvesting and Loss Reduction in Heilongjiang Province 2020, 26(3): 96-97.  DOI: 10.3969/j.issn.1006-8082.2020.03.024 Abstract ( )   PDF (275KB) ( )   The effects of different water content of grain, different harvest times in 1 d, different running speed of machine on the loss rate of rice harvest were studied through field experiments. The results showed that, the harvest loss rate could increase when the water content of grain is ≥17% and ≤15% at harvesting, the best water content of grain is 15%~17%; the harvest loss rate was higher at 7 o'clock, the loss rate gradually decreased after 10 o'clock, it is suggested to start harvesting after 10 o 'clock in fine weather; the loss rate was the lowest when the harvesting machine running at medium speed.

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Occurrence and Chemical Control Techniques of Rice Black Stripe Dwarf Disease in Rongshui County 2020, 26(3): 98-100.  DOI: 10.3969/j.issn.1006-8082.2020.03.025 Abstract ( )   PDF (431KB) ( )   In this paper, the chemical control techniques of black stripe dwarf disease was studied, by taking the investigation, observation and test in Rongshui county. The test set up 3 treatments （no water, shallow water and deep water）, each treatment area is 67 m2. The control agents are 40 g 200 M/g bacillus subtilis and 24 g 25% Pymetrozine WP per 667 m2, applied it once; on the day of spraying, each treatment was marked with 100 infected rice clumps for field observation. The results showed that the better control effects of black stripe dwarf disease of rice in south China could be done by draining rice field water and spraying bacillus subtilis and Pymetrozine mixture evenly, and keeping the field wet for 6~7 days after spraying.

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Occurrence and Succession of weeds in Paddy Fields in Jinqu Area 2020, 26(3): 101-105.  DOI: 10.3969/j.issn.1006-8082.2020.03.026 Abstract ( )   PDF (522KB) ( )   Aiming at the current situation of seriously damage of weeds and unclear weed resources in paddy fields in Jinqu area, we investigated the main weed species and damage in single-season rice and late rice among 9 counties. The results showed that there were 18 species belonging to 9 families in single rice field, among which the grass weeds and sedge families were the most, both were 5 species. There were 11 families and 24 species of weeds in the late rice fields. The Echinochloa phyllopogon （stapf） Koss., Leptochloa chinensis （L.）Nees., Echinochloa caudata Roshev., Paspalum distichum L., E.colonum （L.） Link. were important grass weeds in the paddy field, Cyperaceae weed including Cyperus difformis L.,Cyperus iria L., Juncellus serotinus （Rottb.）C.B.Clarke. Broad-leaf weeds were mainly Monochoria vaginalis（Burm.f.）Preslex Kunth., Ludwigia prostrata Roxb., Lindernia procumbens（Krock.）Philcox., Rotala indica（Willd.） Koehne..The grass weeds in Quzhou are mostly Leptochloa chinensis（L.）Nees.and E.colonum （L.） Link., while the Cyperaceae weeds were mainly Cyperus difformis L.,Cyperus iria L.,Juncellus serotinus （Rottb.）C.B.Clarke., Broad-leaf weeds are mainly weeds such as Monochoria vaginalis（Burm.f.） Preslex Kunth., Ludwigia prostrata Roxb., Lindernia Procumbens（Krock.） Philcox.. At the same time, compared with the weed survey results 20 years ago, the succession pattern of weed communities in rice fields was clarified.

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Situation and Countermeasures of Rice Industry in Zhanjiang City 2020, 26(3): 106-110.  DOI: 10.3969/j.issn.1006-8082.2020.03.027 Abstract ( )   PDF (816KB) ( )   Zhanjiang city is the largest region of rice planting in Guangdong province, known as the “west Guangdong granary”. By referring to Guangdong statistical yearbooks, Zhanjiang statistical yearbooks, China meteorological data networks, etc., and combining the survey data of rice production, the developing situation of Zhanjiang rice industry was systematically expounded from the aspects of climate conditions, sowing area, grain yield, total output, degree of agricultural mechanization, rice deep processing, etc. The problems existed in the development of Zhanjiang rice industry were discussed and analyzed. Finally, the countermeasures and suggestions for the development of Zhanjiang rice industry were put forward.