Effect of manures combined with chemical fertilizer on yield and soil fertility of summer maize
In order to explore the effects of combined application of organic fertilizer and chemical fertilizer on the yield and soil fertility of whole maize,Leyu No.1 maize was selected as the test material through field experiments.There were 8 treatments:no fertilizer(CK),all chemical fertilizer(HF),single application of cow manure(N1),replacement of 20%chemical fertilizer with cow manure(N2),replacement of 30%chemical fertilizer with cow manure(N3),single application of sheep manure(Y1),replacement of 20%chemical fertilizer with sheep manure(Y2)and replacement of 30%chemical fertilizer with sheep manure(Y3).Hay yield,nitrogen,phosphorus and potassium accumulation,heavy metal content of whole maize and soil physicochemical properties were measured.The re-sults showed that the hay yield and N,P,K accumulation of Y2 and Y3 treatments were better than the others.The accumulation of Cu in N2 treatment and Zn in Y1 treatment were the highest.The contents of organic matter,available phosphorus,ammonium nitrogen,nitrate nitrogen and cation exchange in 0-20cm soil layer of N3 treatment were the highest.In conclusion,at low total nitrogen level,sheep ma-nure replacing 20%and 30%chemical fertilizer had positive effects on the growth and nutrient accumulation of whole corn,and cow manure replacing 30%chemical fertilizer had better effect on improving soil fertility.
cow manuresheep manureorganic fertilizer substituting chemical fertilizermaize yieldsoil nutrientsheavy metal content
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