玉米滴灌栽培条件下尿素与氢醌、双氰胺配施方法及效果

本研究通过在滴灌栽培条件下将脲酶抑制剂氢醌(简称HQ)、硝化抑制剂双氰胺(简称DCD)和尿素在玉米盆栽试验中进行配施,以探求HQ和DCD在滴灌施氮肥条件下应用的可行性。试验共设17个处理。试验结果表明:在滴灌施尿素条件下,加入0.3%HQ、0.5%HQ和5.0%DCD于溶液中,尿素的氮素利用率分别为74.8%、75.8%和75.3%,均显著高于单独施用尿素处理;当将HQ和DCD进行土壤施用并配合滴灌浇水时,HQ对提高氮肥利用率无显著作用,但DCD的施用能显著提高尿素氮的利用率;HQ和DCD在滴灌施肥条件下的施用效果要好于土壤施用效果。

Effects and methods of urea application combined with urease or nitrification inhibitors under drip irrigation on maize

In order to evaluate the feasibility of addition of urease inhibitor (hydroquinone,HQ) and nitrification inhibitors(DCD) into urea solution applied in drip fertigation,a pot experiment with maize as a test crop was conducted under greenhouse condition.HQ and DCD were supplied through drip fertigation and soil application before sowing,and the dosages were 0.3%,0.5% and 1.0% of urea application rate for HQ and 2.5%,5.0% and 10.0% of urea rate for DCD.The results indicated that,under drip fertigation with urea solution,0.3%HQ,0.5%HQ and 5.0%DCD could significantly increase N use efficiency(NUE) as compared to fertigation with urea alone,and the NUE were 74.8%,75.8%,75.3% respectively;When HQ and DCD were applied to soil under drip irrigation,HQ showed no positive effect on NUE.However,DCD increased significantly the NUE of urea with data as 61.9%,54.6% and 58.4%,respectively.The NUE of urea with HQ and DCD application in drip fertigation system were higher than that with HQ and DCD applied into soil before sowing under drip irrigation.