Effects Of Nitrogen Application Rate And Nitrogen Application Rate On Yield And Nitrogen Accumulation Of Maize Under Drip Irrigation

This experiment under drip irrigation in Western Songnen plain film, using two factor split plot design, The main area was the number of nitrogen fertilizer and the secondary area was the quantity of nitrogen fertilizer. The times of nitrogen fertilizer application was set up 2 times(T2,30%+60% leaf index period), 3 times(T3,30%+60%+100% leaf index period), 5 times(T5,30%+45%+60%+100% leaf index period+ after tasseling silking 15d) equal proportion fertilization. Nitrogen fertilizer application quantity includes 30(N30), 60(N60), 90(N90), 120(N120) and 150(N150) kg/hm2, A total of 5 chasing nitrogen levels, Treatments were treated with the traditional 1times fertilization(CK1) and total non fertilization(CK2), and a total of 17 treatments, each treatment was set up 3 times. All fertilizer treatments were basal fertilizer N 60 kg/hm2、P2O5 90 kg/hm2 and K2 O 120 kg/hm2. Effects of different amounts of nitrogen topdressing and dressing times on Maize yield formation and Nitrogen accumulation. In order to perfection Songnen Plain western corn yield cultivation techniques and provide a theoretical basis. The results showed that:1. In(T3) leaf index 30%, leaf index 60%, leaf index 100% three times the proportion top dressing, nitrogen application of 120kg/hm2 processing, the highest grain yield, reach 12405.29 kg/hm2, and significantly higher than T3, 30 kg/hm2, 60 kg/hm2, 90 kg/hm2, 150 kg/hm2, film traditional fertilization control treatment and without fertilization 29.5%, 12.3%, 7.8%, 4.9%, 13.3% and 64.6%; Higher than the same amount of fertilizer(T2) 2 times(T2, 30%+60%, leaf index period),the same proportion of fertilization and 5 times(T5, 30%+45%+60%+100% leaf index proportion fertilization period+15d after silking), the same proportion of fertilization 9% and 7.3%.2. Nitrogen absorption performance under conditions T3 nitrogen rate 150 kg/hm2 reaches a maximum 241.82 kg/hm2. Respectively, higher than T2N150 and T5N150 3.8% and 1.6%, each nitrogen rate was higher than T3 treatment conditions from 0.6% to 37%.3. SPAD value of maize, dry matter accumulation, nitrogen accumulation and distribution of plants, Mature corn kernel weight, most of the indicators of nitrogen utilization efficiency, nitrogen agronomic efficiency, nitrogen absorption amount per tone of grain, soluble sugar content, starch content and protein content increased with nitrogen application increasing the amount and duration of the increase, but when the nitrogen amount exceeds 120 kg/hm2, Some trend indicators incidence decreased to varying degrees.4. 45 days after jointing(45DAJS), T3N120 treated leaf area index reached 6.53, Significantly higher than the same period T3N30 ~ T3N90 N treatments 7.6% to 29%, Meanwhile T3N120 significantly higher than the same period T2N120 processing 8.5%(P<0.05), and T5N120 treatment difference was not significant. During the period of T3N120 and the SPAD value of 45 DAJS treatment of maize leaves reached the maximum of each period and the amount of fertilizer was 63.33. Respectively, higher than the same period of the same frequency and fertilization T3N30, T3N60, T3N90, T3N150, CK1, CK2 fertilizer processing 15.29%, 7.94%, 4.45%, 4.73%, 26.08%, 26.84%.In the West Songnen Plain drip irrigation cropping patterns, basic fertility level on the consistent basis, 3 times(T3, 30%+60%+100%, leaf index period),the same proportion of fertilization and the nitrogen application reaches N120(120kg/hm2)will significantly improve nitrogen absorption of corn, nitrogen utilization, dry matter accumulation and increase productivity.