Nitrate leaching in a silage maize field under different irrigation and nitrogen fertilizer rates

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• 作者：Mahdi Gheysari ; Seyed Majid Mirlatifi ; Mehdi Homaee ; Mohammad Esmaeil Asadi ; Gerrit Hoogenboom
• 关键词：Sprinkler irrigation ; Fertigation ; Nitrogen ; Environment ; Water quality ; Deficit irrigation
• 刊名：Agricultural Water Management
• 出版年：2009
• 出版时间：June 2009
• 年：2009
• 卷：96
• 期：6
• 页码：946-954
• 全文大小：845 K

文摘

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, SMD) 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.