Effects Of Nitrogen Application Approaches On The Corn Yield And Characteristics Of Nitrogen Release

Nitrogen mode( one-time administration or nitrogen split application) and nitrogen species(coated urea or urea), all affect the variability of maize soil inorganic nitrogen in different periods, the difference in soil inorganic nitrogen in different periods on It will result in different maize production. Because corn is the absorption of the main form of nitrogen inorganic nitrogen in the nitrate and ammonium. The purpose of this test is to compare under the same conditions for the amount of nitrogen( 160 kg ? hm-2) Different Nitrogen impacts and environmental effects on corn yield and the highest yield of nitrogen as the best treatment plan, compare different ways Nitrogen nitrogen release characteristics. The experiment included six treatments, field arrangement for the randomized block design.Due to various nitrogen application nitrogen fertilizer was applied in the whole growth period led to its inorganic nitrogen content in 0-30 cm soil layer above the inorganic nitrogen content in 30-60 cm soil layer, the minimum inorganic nitrogen content 6 0-90 cm soil layer. And with the advance stage of growth and inorganic nitrogen content of generally declining trend.Nitrogen application methods and different types of nitrogen fertilizer lead to different soil inorganic nitrogen variability at different stages, the resin coated urea and urea mix disposable administration process(CRF3) and disposable resin coated urea application process(CRF2) compared to urea-time application processing(CCF1) than in the heading stage to maintain a higher level of nitrogen supply, while reducing the nitrate content of residual maturity, to achieve "a before-after Paul ’production target for fertilizer increase utilization possible.Each processing production form high to low CRF2> CRF3> CCF2> CCF1> CRF1> CK, by analysis of variance showed that polymer coated urea nitrogen level under the same conditions(CRF2) and mixed with urea resin coated urea application process(CRF3) can play a role in increasing production. Urea split application process(CCF2 process) coated urea on yield and yield differences urea treatment(CRF3) was not significant, sulfur-coated urea resin, a one-time application processing yield except no nitrogen treatment outside the lowest, indicating that sulfur package urea membrane stimulation effect poor.The analysis of maize and heading the surface(0-30 cm) soil nitrate nitrogen, inorganic nitrogen(ammonium and nitrate and) was significantly and positively correlated with the surface of ammonium nitrogen concentration was significantly positive related. Description heading nitrogen concentration in maize 0-30 cm soil layer to form the final corn production has its important role. From the significant correlation between the degree view of the total concentration of ammonium nitrate and corn yield the highest correlation coefficient, followed by the concentration of nitrate nitrogen, ammonium nitrogen concentration again. Described two forms of ammonium nitrate as maize nutrient uptake of maize growth are of great significance.Nitrogen different ways and with different nitrogen sources lead to the same amount of nitrogen inorganic nitrogen variation of different treatments at different growth stages is different, and the Fertilizer Demand Rule maize seedling is a small, increased demand for jointin g stage, heading stage on nitrogen Su demand is relatively high, and the traditional way of fertilizing a shelling(urea-time administration) does not meet this need fertilizer characteristics, in this test Nitrogen was 160 kg ? hm-2 under the heading inorganic nitrogen content of 0-30 cm soil layer become a real limiting factor for corn production. Polymer coated urea(CRF2) and resin coated urea and conventional urea mixed( CRF3) and urea split application( CCF2) process can be very good to 0-30 cm soil inorganic nitrogen heading of control at a high level so these three process output is relatively high.