控释尿素和控释BB肥对夏玉米的增产效果研究

采用控释尿素和普通尿素两种氮素肥料及含控释尿素的BB肥进行夏玉米肥效试验研究。试验结果表明：100％控释尿素处理产量最高，为8714kg／hm^2。和8838kg/hm^2，与同等氮素用量的普通尿素相比，分别增产658kg／hm^2和667kg／hm^2，提高8．2％和8．2％，增产效果显著；控释尿素用量在70％～100％时，产量随氮肥用量的增加而增加，普通尿素也呈同样趋势；70％控释尿素处理与100％普通尿素处理相比，产量差异不大，没有达到显著性差异，说明施用控释尿素可以比普通尿素用量减少约1／3的纯氮用量，夏玉米作物产量并不下降。

Study of Increase in Yield of Summer Corn by Application of Controlled-Release Urea and BB Fertilizers

An experimental study is done of the fertilizer effect of controlled-release urea and ordinary urea as well as bulk-blended （BB） fertilizers containing controlled-release urea on summer corn. The experimental results show that the highest yield is obtained with 100% controlled-release urea, at 8 714 kg/hm^2 and 8 838 kg/hm^2 ; and in comparison with ordinary urea of the same nitrogen amount, the increase in yield is 658 kg/hm^2 and 667 kg/hm^2, an increase of 8.2% , and the increase in yield is remarkable. When the amount of controlled-release urea is 70% - 100% , the yield increases with the increase in the amount used, and ordinary urea shows the same tendency. When 70% controlled-release urea is used as against 100% ordinary urea, there is not much difference in yield, without significant difference. This shows that the amount of controlled-release urea used may be less than that of ordinary urea by one-third in pure nitrogen, but the yield of summer corn does not decrease.