Effects of Microbial Product Coupling Urea on Straw Decomposition Rate and Yield of Rice

LI Yangyang; CHEN Shuaimin; XU Minghong; CHI Chang; MA Wei; WANG Yinping; SONG Yan; FAN Zuowei; WU Haiyan

doi:10.11924/j.issn.1000-6850.casb2024-0317

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Chin Agric Sci Bull ›› 2025, Vol. 41 ›› Issue (9) : 18-24. DOI: 10.11924/j.issn.1000-6850.casb2024-0317

Effects of Microbial Product Coupling Urea on Straw Decomposition Rate and Yield of Rice

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Abstract

To select the most effective microbial product for in-situ decomposition of rice straw under cool conditions in Northeast China, and to determine the optimal dosage of microbial product coupling urea, this study conducted comparative experiments, and used the decomposition rate of rice straw, biological characteristics and yield of rice as indicators to define the optimal microbial product and the dosage of urea. The results showed that the independently developed microbial product NKY showed better field application effects. The straw decomposition rates of Hongqi Farm and Wanchang Town were 68.8% and 67.2%, respectively, which were 38.5% and 35.5% higher than CK. The height, tiller number, and dry weight of rice were also increased, and the rice yield increased by 6.0% and 6.8%, respectively. The optimal dosage for coupling urea with microbial product NKY was 75 kg/hm². Compared with no urea application, the straw decomposition rate increased by 8.7%, and the yield increased by 6.2%. In summary, the microbial product NKY not only has good degradation ability of rice straw, but also could promote crop growth and improve crop yield, which has a better application prospect.

Key words

rice / straw returning / microbial product / decomposition rate / nitrogen application rate / biological characteristics / dry weight / yield

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LI Yangyang , CHEN Shuaimin , XU Minghong , et al . Effects of Microbial Product Coupling Urea on Straw Decomposition Rate and Yield of Rice[J]. Chinese Agricultural Science Bulletin. 2025, 41(9): 18-24 https://doi.org/10.11924/j.issn.1000-6850.casb2024-0317

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Cited in this article [1] Abstract

通过在中国科学院桃源农业生态试验站长期定位试验，研究了不同时期秸秆还田对水稻生长发育的影响。秸秆还田提高水稻分蘖数、叶面积指数和地上部干物质量，增加了水稻每1 m2穗数和每穗实粒数，从而提高了水稻产量。但秸秆还田对早稻生长发育的影响明显大于对晚稻生长发育的影响。在施用氮、磷、钾肥条件下，秸秆还田使早稻产量增加1288%（2005年）和1003%（2006年），效果显著；而晚稻仅增加133%（2005年）和261%（2006年），增产作用不明显。造成秸秆还田对早晚稻生长发育及产量的影响有明显差异的主要原因是早晚稻生育期的温度等气候条件对还田后秸秆腐解及养分释放影响的不同及秸秆还田到水稻移栽这段时间的长短会对有机酸和CO2等物质的浓度产生影响。还对合理利用秸秆资源提出了建议

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