紫云英带籽翻耕的氮肥促腐效应

目的]为了解决紫云英带籽翻耕时草秆不易腐烂问题,同时研究与统传紫云英翻耕相比较对土壤培肥水稻增产的效果。方法]以不施肥、施纯化肥为对照,对传统压绿(紫云英盛花期翻压45 000 kg/hm2)、带籽紫云英翻耕(草秆22 500 kg/hm2翻耕,15 d后加氮肥移栽)、带籽紫云英加氮肥混合翻耕(草秆22 500 kg/hm2加氮肥翻耕,15 d后移栽)利用方式进行试验。结果]在施入总养分量相同的情况下,紫云英3种翻耕处理方式均可提高土壤有机质、速效养分含量,改善土壤生物学性质,提高土壤肥力水平,当年单季稻增产显著。与传统压绿相比,紫云英带籽翻耕增效1 350元/hm2。结论]3种利用方式都起到培肥增产的作用,而将作基肥用的氮肥全部与带籽紫云英混在一起翻耕更能起到促腐培肥增产的功效。

Study on Promoting Decay Effect of Fertilizer-nitrogen of Astragalus sinicus Ploughed at Maturity Stage

Objective] To improve the decay ability of stalk of Astragalus sinicus ploughed at maturity stage,and study effects on rice yield increasing by comparing with traditional method.Method] The treatments were as follow: ploughing without fertilizer,ploughing with chemical fertilizer,ploughing Astragalus sinicus at flourishing flowering stage(45 000 kg/hm2),ploughing Astragalus sinicus at maturity stage(22 500 kg/hm2),and transplanting with fertilizer-nitrogen 15 days later,ploughing Astragalus sinicus at maturity stage(22 500 kg/hm2) combined with fertilizer-nitrogen,and transplanting 15 days later.Result] With the same fertilizer nutrients amounts,all the three plough treatments could increase organic matter and available nutrients and improve the soil biological properties.Meanwhile,the yield of one crop rice also increased significantly.Furthermore,compared with ploughing at flourishing flowering stage,ploughing at maturity stage increased the economic benefits 1 350 yuan/hm2.Conclusion] Three plough treatments can enrich soil and increase rice yield.But ploughing Astragalus sinicus at maturity stage combined with all the base fertilizer-nitrogen can achieve better result.