减施化肥条件下翻压不同量紫云英对双季稻生长和产量的影响

2009～2010年在湖北省通城县和崇阳县设置试验,研究双季稻生产中减施20％和40％化肥条件下最佳紫云英翻压量.紫云英翻压量设15000、22 500、30 000和37 500 kg/hm2 4个梯度.分析早稻和晚稻生长、产量及产量构成因素等数据,结果表明:减施20％化肥条件下,翻压紫云英早稻增产效果明显,与100％化肥相比,最高可达8.6％,紫云英最适用量为22 500 kg/hm2;减施40％化肥条件下,与100％化肥相比,紫云英翻压量30 000 kg/hm2以上增产效果明显,最适用量为37 500 kg/hm2；减施20％化肥条件下翻压30 000和375 000 kg/hm2紫云英后效明显,与100％化肥相比,晚稻分别增产2.7％和2.4％,但减施40％化肥翻压紫云英造成晚稻略有减产.等翻压量下,减施20％化肥各处理的早稻产量和生长一般好于减施40％化肥条件下.因此,双季稻生产中,紫云英替代20％的化肥,翻压量在22 500 kg/hm2比较合适.

Impact of reducing chemical fertilizer combined with Chinese milk vetch on growth and yield of double cropping rice

Field experiment were conducted at Tongcheng and Chongyang county of Hubei province to explore the appropriate usage of Chinese milk vetch(CMV)combined with reduced 20%and 40%chemical fertilizer(CF)during the production of double cropping rice.The series of CMV application was 15 000,22 500,30 000,37 500 kg/hm2.The growth,yield and factors affecting yield of rice were investigated.The results showed that reduced 20%CF combined with CMV increased significantly the early-season rice yield with the highest rate of 8.6%in comparison with the yield of 100%CF and the appropriated CMV usage was 22 500 kg/hm2.The reduced 40%CF combined with 30 000 and 37 500 kg/hm2CMV increased the yield of early-season rice in comparison with that of 100%CF,the appropriated CMV usage was 37 500 kg/hm2.As regards the late-season rice,reduced 20%CF combined with 30 000 and 37 500 kg/hm2CMV increased 2.7%and 2.4%yield compare to that of 100%CF,while reduced 40%CF combined with CMV decreased slightly the yield.Under the same application of CMV,the growth and yield of early-season rice in the treatments of reduced 20%CF were usually better than those of reducing 40%CF.In conclusion,reduced 20%CF combined with 22 500 kg/hm2CMV was appropriate during the production of double cropping rice.