Study on the Increase Production Effect of Top Application Pure Nitrogen in Various Procreating Time and Irrigation in Grouting Time for High Quality Wheat

The statistics and analysis for high quality wheat show that the yield for top application of pure N 120kg/hm 2 in jointing time and irrigation in grouting time is maximum. This yield is more remarkable than that for top application of pure N 105kg/hm 2 in booting time, spraying pure N 15kg/hm 2 in the initial stages of grouting time, and irrigating in grouting time. The difference of the rest treatment for yield is not remarkable. Moreover, colony dynamics, dry weight of plant, dynamic change of leaf acreage exponent, and structure factor of yield for three high production small area that yield is more than 7500kg/hm 2 were analyzed.