摘要
From 2017 to 2018,the effects of winter planting of milk vetch on yield and partial productivity of nitrogen fertilizer of machine-transplanted double-cropping rice under straw returning were studied in Ningxiang city,Hunan Province.The results showed that the dry matter accumulation,effective panicle,yield and partial productivity of nitrogen fertilizer in the stem,leaf,panicle and aboveground parts of early and late rice treated with winter planting milk vetch and straw returning were signi ficantly higher than those treated with straw returning only.Among them,the effective panicles of early and late rice increased by 2.58%,3.18%(2017)and 5.22%,6.32%(2018),respectively.Yield increased by 11.85%,10.07%(2017)and 12.42%,10.92%(2018),annual partial productivity of nitrogen fertilizer increased by 10.90%(2017)and 11.66%(2018),respectively.In conclusion,winter planting milk vetch under straw returning is beneficial to increase dry matter accumulation,rice yield and partial productivity of nitrogen fertilizer in mechanized double cropping rice.
2017-2018年在湖南省双季稻主产区宁乡市开展了秸秆还田下冬种紫云英对机插双季稻产量及氮肥偏生产力的影响研究。结果表明:早、晚稻冬种紫云英+秸秆还田处理的水稻植株茎、叶、穗和地上部分干物质积累量、有效穗、产量及氮肥偏生产力均显著高于秸秆还田处理;其中,早、晚稻有效穗数分别增加2.58%、3.18%(2017)和5.22%、6.32%(2018),产量分别提高11.85%、10.07%(2017)和12.42%、10.92%(2018),周年氮肥偏生产力分别提高10.90%(2017)和11.66%(2018)。综上所述,秸秆还田下冬种紫云英有利于提高机插双季稻的干物质积累,水稻产量和氮肥偏生产力。
基金
国家重点研发计划项目(2018YFD0301004,2016YFD0300906)
国家自然科学基金(31872851)
湖南省农业科技创新资金项目(2019LS03-01)。
