Effect of partial substitution of chemical fertilizer with organic fertilizer on yield and nitrogen use efficiency of maize
In order to clarify the substitution scheme of organic fertilizer for maize in yellow and red loam soil in southern Zhejiang,the effect of chemical fertilizer substitution with fertilizer on maize yield and nitrogen use efficiency was tested.In the field experiments,no fertilization treatment(CK),nitrogen,phosphorus and potassium fertilizer treatment(NPK),phosphorus and potassium fertilizer treatment(PK),nitrogen substitution chemical fertilizer 15%basal organic fertilizer treatment(T15),and nitrogen substitution chemical fertilizer with 30%basal organic fertilizer treatment(T30)were set up.The results showed that compared with NPK treatment,the straw yield of T30 treatment was reduced by 17.11%,T15 and T30 treatments decreased the nitrogen content of grains,by 16.73%and 17.83%,respectively,and the nitrogen uptake of grains in T15 and T30 treatments decreased by 15.00%and 20.30%,respectively.The nitrogen uptake of straw treated with T30 was reduced by 31.75%,and the internal use efficiency of nitrogen in T15 and T30 treatments increased by 23.10%and 28.61%,T30 reduced the content of ammonium nitrogen in soil by 24.61%.This study showed that the replacement of 15%-30%chemical fertilizer nitrogen with organic fertilizer nitrogen could maintain maize yield,improve soil fertility and nitrogen use efficiency,and reduce the amount of chemical fertilizer,which was suitable for popularization and application in maize production in southern Zhejiang.
substitution of chemical fertilizer with organic fertilizermaize yieldnitrogen use efficiency
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