New Long-term Urea On Corn Yield Effect And Its Utilization

Studies of Effects of the New Controlled elease Urea on Corn Increasing Yield and its Utilization Ratio Abstract: The corn experiment was conducted in pots with limy soil derived from bess-like mother material .13y the design method of compete random block, the relationship between the yield of corn and the new controlled-release urea was studied. At the same time, the utilization ratio of the new controlled-release urea was also studwd in the method of difference between values. And the contrast study was conducted accorduig to the indexes which were the effect of increasing production and the utilization ratio of the new controlled-release urea. The results had shown that the new controlled-release urea UHA IIJwas much better than the others: UHAI UHA II and UHA IV. And UHAJII was a new kind of controlled-release urea. It had good effects and was worth being popularized and used. As were shown by the followings: 1 .The new controlled-release urea could improve the content of chlorophyll of the leaves in the different growing penod of the corn and strengthen the intensity of photosynthesis and improve the biological properties of the corn. It could also optimize the structure of the corn yield and significantly improve the yield of the corn seed . The yield of the corn seedwas 3528 percent higher than the controll. UHAffi was the most of the four kinds of the controlled-release urea for the increasing yield of comseed. 2.The new controlled-release urea UHAIII could promote the nitrogen absorbed by the root of the corn which was transported from the part of the under ground to the part of the on ground and accelerate the metabolism of the nitrogen in the corn body. And it could also improve the contents of pure protein and coarse protein and the quality of the corn seed. 3.The new controlled-release urea UHAIII could inhibit the activity of the urease in the soil more powerful than the other three . It could slow down the speed of the releasing of nitrogen from urea to soil. This resulted in the accordance between the changing law of the nitrogen in the soil and the absorbing law of nitrogen of the corn in the early growing period of it. So it made the total nitrogen absorbed from soil by the corn large. The nitrogen utilization ratio of the corn was improved. It was improved by 12.77 increase of one percentage point than the control I. And the nitrogen utilization ratio of the corn to UHAIII was 104.93 percent higher than the control I.