中国生态农业学报（中英文）2026，Vol.34Issue(4)：754-763,10.DOI:10.12357/cjea.20240821
绿肥混播下减氮对双季稻产量与土壤养分关系的影响
Study on the relationship between rice yield and soil nutrients under mixed green manure sowing combined with nitrogen fertilizer reduction in paddy fields
摘要
Abstract
The mixed sowing of Chinese milk vetch and rapeseed during winter is a unique green manure farming mode in southern China that has the potential to replace or partially replace chemical nitrogen fertilizers.However,it is unclear whether a correlation exists between rice yield and soil environmental factors under mixed green manure sowing.This study was conducted on the 3/4 Chinese milk vetch(seed quantity 17.5 kg·hm-2)× 1/4 rapeseed(seed quantity 2.5 kg·hm-2)farming mode,and five nitrogen application treatments were set as below:1)double-cropping rice without nitrogen fertilizer application(CK),2)double-cropping rice with conventional nitrogen fertilizer application(150 kg·hm-2,N1MR),3)double-cropping rice with a 20％reduction in nitrogen fertilizer application(120 kg·hm-2,N2MR),4)double-cropping rice with a 40％reduction in nitrogen fertilizer application(90 kg·hm-2,N3MR),and 5)double-cropping rice with a 60％reduction in nitrogen fertilizer application(60 kg·hm-2,N4MR).Rice yield and soil environmental factors,and the correlations between them under mixed green manure sowing combined with reduced nitrogen fertilizer application were compared and analyzed.The primary results were as follows.1)The 20％reduction in nitrogen fertilizer application of double-cropping rice under mixed sowing and return of Chinese milk vetch and rapeseed guaranteed stable and increased rice yield.Total rice yield of both seasons under the N2MR treatment was the highest in both years,significantly higher than that under the N4MR and CK treatments in 2022(P＜0.05)by 6.80％and 24.18％,respectively,and significantly higher than that under the CK treatment by 50.22％in 2023(P＜0.05).2)Multiple t-test analysis of the soil nutrient contents found that mixed sowing of Chinese milk vetch and rapeseed combined with different nitrogen fertilizer reduction levels affected the soil ammonium nitrogen,organic matter,and available potassium contents to various degrees.The organic matter and available potassium contents of each treatment in 2023 were significantly increased by 33.18％and 285.00％(P＜0.05),respectively,compared to that in 2022;however,the ammonium nitrogen content was significantly reduced by 73.56％(P＜0.05).3)Soil pH,nitrate nitrogen,and available potassium contents were the primary factors affecting rice yield.Significantly positive correlations between the rice yield with 1 000-grain weight,and nitrate nitrogen content(P＜0.05)were observed,a significantly negative correlation between the rice yield and pH(P＜0.05)was observed,and an extremely significantly negative correlation between the rice yield and available potassium content(P＜0.01)was observed.Overall,mixed 3/4 Chinese milk vetch × 1/4 rapeseed sowing combined with a 20％reduction in nitrogen fertilizer application is a green manure farming mode suitable for expanding in southern rice growing regions,in which soil pH,nitrate nitrogen,and available potassium contents are the primary environmental factors.关键词
紫云英/油菜/绿肥混播/产量/土壤环境因子/相关性Key words
Chinese milk vetch/rape/mixed sowing of green manure/rice yield/soil environmental factor/relationship分类
农业科技引用本文复制引用
杨滨娟,刘琴,黄瑶,方志慧,黄国勤..绿肥混播下减氮对双季稻产量与土壤养分关系的影响[J].中国生态农业学报（中英文）,2026,34(4):754-763,10.基金项目
国家自然科学基金项目(32160528)资助 This study was supported by National Natural Science Foundation of China(32160528). （32160528）
