Abstract
Sustainable development of agricultural lands in arid environments is limited by soil salinization. Comprehensive measures were conducted to completely improve soil salinization in this study. For the purpose of assessing the effect of comprehensive improvement in salinized farmland in arid zone, soil salinity at a range of soil depths, EC of subsurface pipe drainage and crop yield during crop growth period in Xinjiang, China were investigated. The results show that soil salinity decreased significantly on mildly (1–3 dS m-1) and moderately (3–6 dS m-1) salinized farmlands. The improvement in moderately salinized soil was better than that in mildly salinized soil. The average desalinization rate of mildly and moderately salinized farmland was 15% and -15.8%, respectively. The more irrigation times were, the better desalinization effect became. The EC of drainage water varied in the range of 7.53–11.16 dS m-1 and was greater than the EC of irrigation water, which showed that subsurface pipe drainage can remove soil salinity from salinized farmlands. The crop yield using comprehensive improvement increased significantly compared with the control check. The outcome of this study suggests that comprehensive measures on salinized farmland are conductive to the decrease of soil salinity and the increase of crop yield.
Highlights
Salinized soil in Xinjiang, China occupy approximately 33% of the nationwide salinized land area, which has a strong impact on plant establishment, land revegetation and performance of land productivity in arid zone[1,2]
Under the condition of comprehensive improving in mild soil salinization soil salinity decreased significantly (Fig 3)
Drain pipe was laid one time and could be used for many years. These results indicate that comprehensive measures with pipe drainage was effective to decrease soil salinization and increase economic benefit
Summary
Salinized soil in Xinjiang, China occupy approximately 33% of the nationwide salinized land area, which has a strong impact on plant establishment, land revegetation and performance of land productivity in arid zone[1,2]. The improvement of soil salinization is necessary to create favorable conditions for land revegetation. Reclamation of salt affected land will be able to raise a locally ecological environment and a healthy stimulate economy development[3]. The approaches involved chemistry measures[4], biological measures[5] and engineering measures [6] to control and monitor soil salt and water content changes. It is essential to study physical and chemical properties of soil as well as crop production with improving soil salinization. Chaganti et al.[8] applied chemical improvement to reduce the soil pH and salinity significantly.
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