Nitrate leaching in a silage maize field under different irrigation and nitrogen fertilizer rates
Nitrate leaching in a silage maize field under different irrigation and nitrogen fertilizer rates
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DOI：
10.1016/j.agwat.2009.01.005
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发表时间：
2009-06-01
影响因子：
6.7
通讯作者：
Hoogenboom, Gerrit
中科院分区：
文献类型：
--
作者：
Gheysari, Mahdi;Mirlatifi, Seyed Majid;Hoogenboom, Gerrit
氮（N）和水对硝酸盐（NO3）损失的相互作用的量化为更有效的氮和水管理提供了重要的见解。研究了不同灌溉和氮肥水平对青贮玉米田硝态氮淋溶的影响。试验包括4个灌溉水平（土壤水分亏缺0.7、0.85、1.0和1.13，SMID）和3个施氮水平（0、142和189 kg N ha（-1）），重复3次。在36个试验地块中，使用陶瓷吸盘提取30和60 cm土壤深度的土壤溶液。在播种期和收获成熟期分别测定了0-30和30-60 cm土层土壤硝态氮含量。还测定了作物的总氮吸收量（NU）。60 cm土层中NO3-N淋失量最大为8.43 kg N ha（-1），其中142 kg N ha（-1）和过量灌溉（1.13 SMD）处理的最大淋失量为8.43 kg N ha（-1）。60厘米深度处的最小和最大季节平均NO3浓度分别为46和138 mg l（-1）。根据我们的研究结果，这是可能的控制NO3淋溶出根区在生长季节与灌溉和施肥管理的适当组合。(C)2009 Elsevier B. V.保留所有权利。
Quantification of the interactive effects of nitrogen (N) and water on nitrate (NO3) loss provides an important insight for more effective N and water management. The goal of this study was to evaluate the effect of different irrigation and nitrogen fertilizer levels on nitrate-nitrogen (NO3-N) leaching in a silage maize field. The experiment included four irrigation levels (0.7, 0.85, 1.0, and 1.13 of soil moisture depletion, SMID) and three N fertilization levels (0, 142, and 189 kg N ha(-1)), with three replications. Ceramic suction cups were used to extract soil solution at 30 and 60 cm soil depths for all 36 experimental plots. Soil NO3-N content of 0-30 and 30-60-cm layers were evaluated at planting and harvest maturity. Total N uptake (NU) by the crop was also determined. Maximum NO3-N leaching out of the 60-cm soil layer was 8.43 kg N ha(-1), for the 142 kg N ha(-1) and over irrigation (1.13 SMD) treatment. The minimum and maximum seasonal average NO3 concentration at the 60 cm depth was 46 and 138 mg l(-1), respectively. Based on our findings, it is possible to control NO3 leaching out of the root zone during the growing season with a proper combination of irrigation and fertilizer management. (C) 2009 Elsevier B.V. All rights reserved.