1Micro-element Research Center, Huazhong Agricultural University, Wuhan-430 070, China
2Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River) Ministry of Agriculture, Huazhong Agricultural University, Wuhan-430 070, China
3Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, Pakistan
4College of Plant Scinces, Huazhong Agricultural University, Wuhan, China
5Botany Department Faculty of Science, Fayoum University, Fayoum, 63514, Egypt
College of Resources and Environment, Huazhong Agricultural University, Wuhan, China
*Corresponding author's e-mail: hucx@mail.hzau.edu.cn
Online published on 2 January, 2019.
Nitrogen management is the major challenge due to narrow understanding of yield and N uptake relationship on saltaffected soils. To address this problem, a lysimeter experiment for rice and wheat was conducted on salt-affected soil with two lower (15 and 30%) and three higher N rates (15, 30 and 45%) with 50 and 100% SGR. NO3−leaching was greater with higher N rates (up to 188 mg Leachate−1) in rice as compared to wheat. After the harvesting of rice and wheat, maximum decrease in soil pHs (7.75%), ECe (41.50%), SAR (63.64%) was with N130 G100 which indicated that applied gypsum 100% SGR with higher N rate ameliorated the soil more efficiently as compared to 50% SGR. The highest yields recordedwith N130+ 100% SGR. Thehighest NUE (15.88 g/g) was with treatmentG100 N130in rice but in wheat (NUE, 44.76 g/g) G100 N70 proved to be the best. It was concluded that G100 N130 proved to be the best and reduced the environmental risks.
Nitrate leaching, Nitrogen use efficiency, Rice-wheat cropping system, Salt-affected, Soil amelioration
