Effect of Different NPK Fertilizers Cooperating Application on Yield and Quality of High Starch Maize

摘要

Effect of nitrogen,phosphorus and cooperation application on grain yield and qualities of high starch maize Zhengdan 18 was studied.Six different fertilization treatments based on the random-plot experiment.The results indicated that N fertilizer significantly increased yield,as compared with the non-fertilizer treatment,the yield with the combined application of N and P fertilizers was higher than that of maize with single N treatment,the yield with the combined application of N P and K fertilizers was superior to that of maize with the combined application of N and P fertilizers.The yield was increased with the increase of the fertilization amount of the combined application of N,P and K,but there was not the direct proportion between yield and fertilization amount in the growth period,obeying the reward descending rule.The number of grains of ear was important for seed yield.The experiments showed the contents of starch,lipid and protein were increased along with the increase of N fertilization amount The content of starch was increased in the early stage and reduced in the late stage of postulation.At the same time,The contents of lipid and starch were not increased along with the increase of phosphorus fertilizer.The same is that the contents of lipid with the combined application of N,P and k fertilizers were higher than that of the combined application of N and P fertilizers,the accumulation of lipid was increased,while the accumulation of starch and protein were not increased with the increase of K fertilizers.The contents of protein,starch and lipid were higher in the early stage than that in the late stage of postulation with the low-fertilizer treatment.The accumulation of starch was increased with the increase of the amount of the combined application of N,P and k fertilizers,the content of protein and iipid were increased in its early growth stage,while its content was not increased in the late growth period.Considering for the economic performance and the balanced principle for the supply and demand of applying fertilizer,currently the best applying fertilizer treatment is: N.225kg/bm2,P2Os:112.Skg/hm2.