| Abstract:In order to clarify effect of seeding rate on soil nutrient change of soil nutrient under wheat stubble multiple cropping rape in northwest region,a plot expriment was conducted to examine effects of yield and soil environment of pH ,organic matter,available N,available P,available K in Gulang country. Six treatments(CK，T1,T2,T3,T4,T5) were designed with seeding rate of 7.5 kg/hm,11.25 kg/hm,15.0 kg/hm,18.75 kg/hm and 22.5 kg/hm. The results showed that the yield of rape was highest at 15.0 kg/hm.The rape yield increased with increase of seeding rate. Wheat stubble multiple cropping rape could improve the content of soil organic matter,increase soil available P desorption,root secretion of organic acids material could reduce the soil pH; wheat stubble multiple cropping rape significantly reduced the soil available potassium mass fraction,we should pay attention to complement potassium application . |
