Effect of straw returning combined with different exogenous substances on soil nutrients and crop yield in the old Yellow River course region
[Objective]The present paper aimed to improve the effect of straw returning in sandy soil in the old Yellow River course region,thereby improving soil quality and crop yield.[Method]The effect of nitrogen(N),organic fertilizer(M),microbial agent(B),organic fer-tilizer+microbial agent(MB),soil enzyme agent(S),organic fertilizer+microbial agent+soil plant enzyme agent(MBS)on soil nutri-ents and crop yields was studied and compared based on the technique of straw-activated returning.[Result]The technique of straw-activated returning by adding exogenous materials could improve soil fertility and crop yield.The effect of N treatment on soil nutrient content and crop yield was not significant when N application was increased by 187.5 kg/hm2.Compared with non-exogenous material(CK)treatment,MB treatment could increase soil organic matter and nutrient content,and the crop yield was also increased significantly.MBS treatment could fur-ther increase the straw returning effect.Compared with CK treatment,the soil organic matter content of MBS was increased by 4.5％-10.3％,total nitrogen was increased by 18.3％-33.8％,available phosphorus was increased by 11.3％-25.5％,and available potassium was increased by 52.6％-99.6％;Compared with the other five treatments of exogenous application,the corn yield of MBS was increased by 3.0％-32.0％,soybean yield was increased by 0.5％-30.2％,and wheat yield was increased by 5.4％-14.3％.[Conclusion]In all treatments,straw returning combined with organic fertilizer+biological agents+soil enzyme(MBS)additives has the best effect on improving soil nutrient content and crop yield.
Straw returningExogenous substanceThe old Yellow River course regionSoil nutrientCrop yield
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