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Distribution and dynamics of soil water and salt under different drip irrigation regimes in northwest China


Distribution and dynamics of soil water and salt under different drip irrigation regimes in northwest China



Irrigation Science 31(4): 675-688



ISSN/ISBN: 0342-7188

DOI: 10.1007/s00271-012-0343-3

A 2-year experiment was carried out to investigate the effects of different drip irrigation regimes on distribution and dynamics of soil water and salt in north Xinjiang, China. Five treatments F7 (.24 dS m?1 + Once every 7 days), B7 (4.68 dS m?1 + Once every 7 days), S7 (7.42 dS m?1 + Once every 7 days), F1 (.24 dS m?1 + Once every 1 days) and F3 (.24 dS m?1 + Once every 3 days) were designed. For all treatments, additional 15-mm fresh water was applied on 1th November in 29 (winter irrigation) to leach the accumulated salt. The results revealed that irrigation frequency and water quality had significant effects on the spatial distribution and change of soil water content, soil salt and the crop water consumption rate, but had a limited impact on the seasonal accumulative water consumption, and the cotton yield decreased with the decrease in irrigation frequency and water quality on the whole. During the cotton growing season, results showed that the salt mainly accumulated in the - to 6-cm soil layer, while the soil salt in 6- to 1-cm layer changed slightly, indicating that the drip irrigation could not leach the soil salt out of the root zone under the irrigation regimes. Therefore, salt leaching was necessary to maintain the soil water salt balance and to prevent excessive salt accumulation in the root zone. After the 15-mm winter irrigation and subsequent thawing, soil salts were leached into the deeper layers (below 6 cm), and the soil salt content (SSC) (EC1:5) in root zone in the next year was about .2 dS m?1. Moreover, compared to 29 season, the SSC within the root zone did not increase even the EC of the irrigation water was up to 7.42 dS m?1. Additionally, it is important to note that the results were concluded based on the data of the 2-year experiment; further studies are need to optimize winter irrigation amount and assess the sustainability of saline water irrigation since long-term utilization of saline water may lead to soil degradation.

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