Based on a long-term experiment of applying N and P fertilizer for 18 years,effects of long-term fertilization on wheat yield and N and P uptake were studied.Result showed that,fertilizer N increased wheat yield clearly,the yield increased by 198.42% and 122.14% with 90 kg/hm2 and 180 kg/hm2 respectively,but the yield showed no significant increase with P fertilizer applied only.N and P applied together could increase the yield from 267.84% to 472.88%.Under the conditions,N content of wheat stem was of sign...
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