|Author:||Gheysari, Mahdi ; Asadi, Mohammad Esmaeil ; Hoogenboom,Gerrit ; Mirlatifi, Seyed Majid ; Homaee, Mehdi|
|Book Group Author:||NA|
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 189kgNha⁻℗£), with three replications. Ceramic suction cups were used to extract soil solution at 30 and 60cm 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 8.43kgNha⁻℗£, for the 142kgNha⁻℗£ and over irrigation (1.13 SMD) treatment. The minimum and maximum seasonal average NO₃ concentration at the 60cm depth was 46 and 138mgl⁻℗£, 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.
|Pages:||946 - 954|
|Journal:||Agricultural water management|
pollution control, growing season, seasonal variation,rhizosphere, mineralization, fertigation, sprinkler irrigation, deficitirrigation, crop yield, fertilizer rates, corn silage, nitrates,nitrogen fertilizers, leaching, soil water content, soil solution,nitrate nitrogen, irrigation management, Iran