Effects of planting years on soil salinity and watermelon yield in gravel-sand mulched field
MA Zhongsheng1, TAN Junli1,2 *, MA Xiaofu3, WEI Tong1
1.School of Civil Engineering and Hydraulic Engineering, Ningxia University, Yinchuan, Ningxia 750021, China; 2.Engineering Research Center for Efficient Utilization of Water Resources in Modern Agricultural in Arid Regions, Ministry of Education, Yinchuan, Ningxia, 750021, China; 3.Ningxia Water Conservancy, Yinchuan, Ningxia 750021, China
Through field experiments, effects of planting years on soil salinity and yield of watermelon in the gravel-sand mulched field around Xiangshan region of Ningxia were studied in order to provide a reference for continuous use of gravel-sand mulched field and estimation of watermelon productivity. The results showed that the soil salinity in 0-80 cm soil layer decreased continuously with the increase of planting years. After 6 a, 10 a, and 15 a planting, the salinity in 0-80 cm soil layer in saline-alkaline gravel-sand mulched field is lowered by 70.3%, 21.4% and 56.4%, respectively, in comparison with 3 a planting soil. However, the salinity in non-saline-alkaline gravel-sand mulched field is decreased by 50.6%, 62.4% and 34.8%, respectively. With increasing soil depth, the salinity rises in both sorts of gravel-sand mulched field. The pH value decreases firstly and then increases across 0-80 cm soil layer in the non-saline-alkaline gravel-sand mulched field. The yield of watermelon is closely related to soil salinity; specially, the yield increases with decreasing salinity in the saline-alkaline gravel-sand mulched field. However, the yield in the non-saline-alkaline gravel-sand mulched field rises initially and declines afterwards with increasing soil salinity.
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