紫云英结荚翻耕还田对土壤肥力及水稻产量的影响

Effect of Astragalus sinicus Returning to Field in Maturity on Soil Fertility and Yield of Rice

紫云英翻耕作绿肥能培肥土壤,减少化肥投入,促进绿色稻米产业发展。于2009年利用田间小区试验研究了紫云英盛花后不同时期翻耕的干物质量和植株含氮量的关系,及比较结荚期不同翻耕量对稻田土壤和水稻产量的影响。结果表明:从盛花期至结荚成熟期紫云英氮素含量逐渐降低,盛花期后鲜产量也逐渐降低,而对应单位面积干物重在盛花期后则呈现上升趋势。采用紫云英结荚成熟期翻耕技术,氮素虽与盛花期还田相比有一定损失,但与单季稻茬口衔接,可减少翻耕成本、节省播种种子及用工成本;结荚期紫云英翻耕能提高稻田有机质含量,实现增产效果。

Astragalus sinicus could improve soil fertility,reduce fertilizer amount,and promote the development of green rice industry.A study about the correlation between dry weight and plant nitrogen content of Astragalus sinicus after flowering periods were carried out in 2009,and the effect of Astragalus sinicus returning to field in maturity on soil fertility and yield of rice were studied.The results showed that：the wet weight and nitrogen content of Astragalus sinicus decreased from flowering to maturity stage,however,dry weight increased.By milk vetch returning to field in maturity,there was some loss of nitrogen than returning in flowering,however,it has more economic benefits due to tillage reducing and the seeds saving.The Astragalus sinicus can increase the organic matter content of field and rise the rice yield by returning to field in maturity.