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- Title
覆膜滴灌条件下土地开垦年限对土壤盐分、养分和硝态氮分布特征的影响
- Authors
张少民; 白灯莎; 刘盛林; 周广威; 冯固
- Abstract
【Objective】 To study the sustainability of cotton planting in saline-alkali under mulching drip irrigation.【Method】The changes of soil salinity, pH, soil profile fertility and NO3- -N and NH4+-N were studied with the method of space-time conversion in different land plots with different reclamation years (0, 2, 4, 5, 6 and 15).【Result】The results showed that soil salt concentration decreased with the years of land cultivation. The decrease of total salt content was notable at the first four years of cultivation, the average salt content within 1m soil profile decreased by 75.8%, while it changed slowly during the 5 th-15 th years of cultivation with an average salt content of 0.72 ms/cm in 0-40 cm soil layer, but with a high pH value, about 9.0; The soil fertility was improved by cultivation, soil organic matter, Nmin and Olsen-P were increased significantly after land cultivation for 6 years. The farmland management measures (such as drip irrigation, fertilisation) increased the NO3- -N content in the whole 1m soil layer after cultivation. When land was reclaimed for 4 years with drip irrigation under plastic mulch, the soil NO3- -N already transferred to the soil depth of 80-100 cm.【Conclusion】The soil salinity was decreased and fertility was improved after saline-alkali land cultivation. The soil salt content was not limiting factor for cotton growth but probably for high soil pH after cultivation for 4 years, and at that time there was a risk of NO3- -N leaching to the soil layer below 1 m.
- Publication
Xinjiang Agricultural Sciences, 2018, Vol 55, Issue 11, p2060
- ISSN
1001-4330
- Publication type
Article
- DOI
10.6048/j.issn.1001-4330.2018.11.013