关键词: 烟草, 烟草, 微量元素, 空间变异性, 地统计学

Abstract:

To explore the NPN supplement; in the role of breeding industry of cows， select, related materials and methods to research. Choose thirty-two China Holstein dairy cows, and then randomly divided them into two groups: experiment group and control group, each group is sixteen .In the experimental group feed with NPN supplement to replace a certain number of conventional protein supplement. The control group feed with conventional material, do not add NPN supplementary material .After years of experimentation, The results shows: experimental group output is 16108 kg and control group output is 15289 kg. the former more than the latter 819 kg. The average daily milk yield number of cow per day increase 0.85 kg，decides on a price 2 yuan/kg ideas by the fresh milk to be the equivalent to increase 1.7 Yuan per day. Calculate the cost of feed while with NPN supplementary material replacing the conventional protein supplementary material in Hu sesame seed cake. The concentrated feed total cost drops 544 Yuan. Namely the experimental group drops 544 Yuan compared to the control group feed cost. Experimental group average each saves the feed cost 0.57 Yuan every day. Concluded that non protein nitrogen supplement effect on cows output and economic benefits ，its application in production is of guiding role.