玉米产量、肥料利用率对化肥减量配施微生物菌肥的响应OA

In order to investigate the effects of fertilizer reduction combined with microbial fertilizer on maize yield,fertilizer utilization rate and soil nutrient content,screen out the optimal dosage of microbial fertilizer,the experiment included control groups of no fertil-izer application and conventional fertilizer application.On the basis of reducing conventional fertilizer application by 20％,four differ-ent dosages of microbial biofertilizers(300,600,900,1 200 kg·hm-2)were applied.Maize ear traits,yield,fertilizer utilization rate,and changes in soil pH,organic matter,and fertilizer element content were measured.The results showed that fertilizer reduction com-bined with medium and high microbial fertilizer significantly affected the yield formation.With a 20％reduction in conventional fertil-ization combined with 900 kg·hm-2 microbial fertilizer,the length,ear diameter,seed emergence rate,number of rows,number of grains in rows and yield of corn significantly increased by 3.29％,2.70％,4.07％,3.76％,1.84％and 16.31％,and the bare tip de-creased by 18.18％.Meanwhile,the utilization rates of nitrogen,phosphorus and potassium were significantly increased by 28.20％,27.29％and 24.00％.Compared with conventional treatment,soil pH value increased by 6.83％-7.93％,and contents of organic mat-ter,alkali-hydrolyzed nitrogen,available phosphorus and available potassium increased by 4.87％-25.80％,1.73％-12.42％,7.72％-28.21％and 1.49％-9.31％.The soil nutrient content increased with the increase of the amount of microbial fertilizer.Considering the economic cost effect of production,it is recommended to apply the fertilizer mode of 20％reduction of conventional fertilization com-bined with 900 kg·hm-2 microbial fertilizer to corn production.