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首页> 外文期刊>Soil Science and Plant Nutrition >Effects of dicyandiamide (DCD) on nitrate leaching, gaseous emissions of ammonia and nitrous oxide in a greenhouse vegetable production system in northern China.
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Effects of dicyandiamide (DCD) on nitrate leaching, gaseous emissions of ammonia and nitrous oxide in a greenhouse vegetable production system in northern China.

机译：双氰胺（DCD）对中国北方温室蔬菜生产系统中硝酸盐淋失，氨气和一氧化二氮的气体排放的影响。

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摘要

The excessive input of nitrogen (N) fertilizer and irrigation water to greenhouse vegetable production systems leads to N losses via nitrate (NO3--N) leaching, ammonia (NH3) volatilization and nitrous oxide (N2O) emissions. Besides management of N fertilizer and irrigation inputs, the addition of the nitrification inhibitor dicyandiamide (DCD) has also been shown to mitigate N losses from soils. A greenhouse experiment was set up to identify the effects of combining DCD with recommended N and irrigation management on NO3--N leaching, NH3 volatilization and N2O emissions under intensive vegetable production of tomatoes (Lycopersicon esculentum Mill.). The five treatments were: (A) control+TMI (traditional managed irrigation); (B) TN (traditional N rate applied at 410 kg N ha-1)+TMI; (C) RN (recommended N rate applied at 210 kg N ha-1)+DCD (21 kg ha-1)+OMI (optimum managed irrigation); (D) 80%RN (N rate applied at 80% of the recommended N rate, 168 kg N ha-1)+DCD (16.8 kg ha-1)+OMI; and (E) 120%RN (N rate applied at 120% of the recommend N rate, 252 kg N ha-1)+DCD (25.2 kg ha-1)+OMI. DCD was applied at the rate of 10% of the N application rate. The results showed that the recommended N rate and irrigation with the addition of DCD (RN+DCD+OMI, 80%RN+DCD+OMI, and 120%RN+DCD+OMI) can significantly reduce N loss as NO3--N, NH3 and N2O. The average NO3--N concentrations in the top soil depth were decreased by 49.34-55.54%, total NH3 volatilization were decreased by 20.61-41.51%, and N2O emission factors were reduced by 84.07-96.19%. In addition, the utilization efficiency of N was enhanced. However, there was no significant effect of the recommended N rate and DCD plus optimum managed irrigation on tomato yield. Overall, these results suggest that applying 80%RN+DCD+OMI may provide a practicable option for both mitigating N losses and improving utilization efficiency of N under intensive greenhouse vegetable production systems.
机译：向温室蔬菜生产系统过量输入氮肥和灌溉水会导致硝酸盐（NO 3 - -N）的淋溶，氨（NH < sub> 3 ）挥发和一氧化二氮（N 2 O）排放。除了管理氮肥和灌溉投入外，还显示出添加硝化抑制剂双氰胺（DCD）可以减轻土壤中的氮损失。建立温室试验，以确定DCD与推荐氮和灌溉管理相结合对NO 3 - -N淋溶，NH 3 淋洗的影响番茄集约化生产下的挥发性和N 2 O排放（Lycopersicon esculentum Mill。）。这五种处理方法是：（A）对照+ TMI（传统管理灌溉）; （B）TN（以410 kg N ha -1 施加的传统N量）+ TMI; （C）RN（建议的施氮量为210 kg N ha -1 ）+ DCD（21 kg ha -1 ）+ OMI（最佳管理灌溉）; （D）80％RN（按建议N量的80％施氮，168 kg N ha -1 ）+ DCD（16.8 kg ha -1 ）+ OMI; （E）120％RN（以建议N量的120％施氮，252 kg N ha -1 ）+ DCD（25.2 kg ha -1 ） + OMI。 DCD以N施用量的10％的比率施用。结果表明，建议的氮肥施用量和添加DCD（RN + DCD + OMI，80％RN + DCD + OMI和120％RN + DCD + OMI）的灌溉可以显着减少N损失，因为NO 3 - -N，NH 3 和N 2 O。表层土壤深度的平均 sub> 3 - -N浓度降低了49.34-55.54％，总的NH 3 挥发减少了20.61 -41.51％，N 2 O排放因子减少了84.07-96.19％。另外，提高了N的利用效率。但是，建议的氮肥施用量和DCD加上最佳管理灌溉对番茄产量没有显着影响。总体而言，这些结果表明，在集约化温室蔬菜生产系统下，施用80％RN + DCD + OMI可能为减轻氮素损失和提高氮素利用效率提供了可行的选择。

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