Nitrogen And Potassium Nutrient Interaction Effects Of Maize In Eastern Jilin Province

For reasonable balanced fertilization, increase crop yields, improve nutrient use efficiency, this thesis east of spring corn as the research object, through field experiments and laboratory analysis is provided nitrogen and phosphorus each five levels of different N and P level of Jilin spring maize production in eastern provinces, biomass production, nutrient uptake accumulation and nutrient use efficiency, studies show that:1. quadratic regression equation of nitrogen and phosphate fertilizer production indicate: forming a typical parabolic relationship between nitrogen and phosphorus and the yield of the three, the interaction of nitrogen and phosphorus can significantly improve the yield of spring maize. Analog equation optimum amount of fertilizer:nitrogen 270.56kg/hm, phosphorus 185.4kg/hm, the highest yield at this time, was 12621.9kg/hm. Nitrogen and phosphorus has a significant impact on spring corn yield. Within a certain range, the spring corn yield with nitrogen and phosphorus application amount increased with the increase, but when the application exceeds a certain threshold, the yield decreased. To handle (N280P110) the highest yield for 12796.4kg/hm, to achieve high level. Yield components on yield of the order of:the number of grain>grain weight> spike number.2. N and P fertilization on dry matter accumulation of spring maize promote the role of early and late in the reproductive cycle, dry matter accumulation is slow, medium fast accumulation, the overall trend of an S-shaped, and with the increase of the amount of fertilizer, dry after the first increase to reduce the amount of material accumulation; dry matter accumulation of applying fertilizer treatment was significantly higher than other treatments, to deal with (N280P110) of dry matter accumulation highest,386.45 g/strains.3. The interaction between nitrogen and phosphorus significantly promote nitrogen uptake, each plant nitrogen accumulation process with the progress and growth of plant growth period, the whole process, there were two nitrogen accumulation phase of rapid growth, the first rapid growth phase appears in the jointing stage (47 days after emergence)-bell stage (63 days after emergence), the second phase of rapid growth occurs in the heading stage (74 days after emergence)-filling period (93 days after emergence); Nitrogen in the process, the nitrogen absorption rate and absorption accumulation of significant differences, the average cumulative amount absorbed N70, N140, N280, N420 treatment were 24% higher than the NO treatment, 39%,66%,65%. Processing (N280P110) accumulation of nitrogen in the growth period up to the maturity of 280.14 kg/hm24. Interaction of nitrogen and phosphate fertilizer plant accumulation of the effects of phosphorus and nitrogen accumulation of influence substantially the same, each plant phosphorus accumulation process with the progress and growth of plant growth period, the whole process, the accumulated amount of phosphorus appear three rapid growth phase, where bell stage (63 days after emergence)-heading stage (74 days after emergence) accumulation rate fastest average growth24.53 kg/hm2 accounted for 39% of the average of the total phosphorus accumulation of phosphate fertilizer plant the amount of influence dominates in the phosphate treatment, phosphorus absorption rate and accumulation absorb significant difference, P55, P110, P220, the average cumulative amount absorbed P330 treatment were higher than P0 treatment 24%,67%,50%,37%. Phosphorus accumulation process (N280P110) the highest growth period to maturity of 89.22 kg/hm2.5. Interaction of nitrogen and phosphorus conditions, the trend of corn nitrogen and phosphorus efficiency indicator of the efficiency is substantially the same. Comparative analysis of the indicators for each treatment, each fertilizer treatment, the average utilization rate of P110 nitrogen highest wherein (N280P110) 42.19% of farmers conventional treatment nitrogen utilization was 30.71%; in the nitrogen treatment, N280 average maximum utilization of fertilizer, which (N280P110) was 35.41%, the conventional treatment of farmers fertilizer utilization rate was 20.86%.6. Studies have shown that the best treatment in this experiment (N280P110) production was 12796.4 kg/hm2, nitrogen use efficiency of 42.19%, fertilizer utilization rate of 35.41%.