摘要:
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。
关键词:
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双氰胺
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氢醌
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滴灌施肥
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玉米
Abstract:
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.
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