Effects of Increased Application of Organic Fertilizer on Maize Yield and Grain Quality under Maize-Soybean Rotation System for Four-Year Consecutive
This study evaluated the effects of cattle manure on maize yield and grain quality in a Mollisol re-gion with five treatments:NoF(no fertilizer),LZ(chemical fertilizer,no manure,continuous cropping),CF(chemical fertilizer,no manure,soybean-maize rotation),CF+15T(CF plus 15 000 kg/ha of manure),and CF+30T(CF plus 30 000 kg/ha of manure).The results showed that LZ reduced maize yield by 15％compared to CF,while CF+15T and CF+30T increased yields by 8.8％and 13％,respectively.In the soybean-maize rotation,manure addition raised the levels of free amino acids,soluble sugar,and starch in maize grains,with no impact on protein content.Four years of manure application significantly increased K,Na,Mg,and P levels but did not affect Ca,Mn,Fe,and Zn in maize grains.Therefore,continuous cropping in Mollisols reduces maize yield but not nutritional quality,while adding 15 000 kg/ha of manure under soybean-maize rotation enhances yield,starch,free amino acids,solu-ble sugar,and minerals like K,Na,Mg,and P in maize grains.
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