干旱区研究

Arid Zone Research >

2022 , Vol. 39 >Issue 6: 1952 - 1965

DOI: https://doi.org/10.13866/j.azr.2022.06.25

Agricultural Ecology

Effects of saline water drip irrigation on soil salt accumulation and cotton growth during the whole growth period

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  • Key Laboratory of Oasis Ecological Agriculture Corps, College of Agriculture, Shihezi University, Shihezi 832003, Xinjiang, China

Received date: 2022-04-11

  Revised date: 2022-07-26

  Online published: 2023-01-17

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Abstract

There is a shortage of freshwater resources in arid areas, but saline water resources are abundant. Long-term saline water irrigation will affect soil chemical properties, cotton growth, and yield. By studying the effects of different irrigation water salinity and nitrogen application rates on soil soluble salt ions, soil elements, enzyme activity, cotton growth, and yield, their relationship was analyzed. Three kinds of irrigation water salinity were set in the experiment, which were 0.35 (freshwater), 4.61 (brackish water), and 8.04 (saline water) dS·m-1, expressed in FW, BW, and SW, respectively. The nitrogen application rates are 0 and 360 kg·hm-2 respectively, which are expressed as N0 and N360, respectively. The results showed that: (1) compared with fresh water irrigation, brackish water, and saline water irrigation significantly reduced cotton biomass and seed cotton yield. Compared with no nitrogen application, nitrogen application significantly increased cotton biomass and seed cotton yield. (2) With the increase in salinity of irrigation water, the contents of Na+, Ca2+, Cl-, and Ca increased significantly, while the contents of S O 4 2 -, H C O 3 -, Mg2+, Na, Ni, Co, Cr, K, Fe, Se, and Cu decreased significantly. Under the condition of nitrogen application, the contents of Na+, Ca2+, Cl-, and S O 4 2 - increased significantly, while the contents of H C O 3 -, Mg2+, K+, P, K, Ca, Fe, Se, Zn, Al, and Mg decreased significantly. (3) With the increase in salinity of irrigation water, the activities of sucrase, catalase, dehydrogenase, polyphenol oxidase, hydroxylamine reductase, alkaline phosphatase, and aryl sulfatase decreased significantly, while the activities of nitrate reductase and nitrite reductase increased significantly. Nitrogen application significantly increased soil enzyme activity. Comprehensive analysis showed that saline water irrigation reduced the activities of soil sucrase, catalase, dehydrogenase, polyphenol oxidase, hydroxylamine reductase, alkaline phosphatase, and aryl sulfatase, and reduced the yield of seed cotton. The soluble salt ions Cl-, SO42-, Na+, and Ca2+ in saline water were the main driving factors for the change in enzyme activity.

Key words： water salinity; nitrogen application rate; soil ions; soil enzyme activity; seed cotton yield

Cite this article

GUO Xiaowen,LIU Jiawei,ZHENG Zhiyu,MIN Wei . Effects of saline water drip irrigation on soil salt accumulation and cotton growth during the whole growth period[J]. Arid Zone Research, 2022 , 39(6) : 1952 -1965 . DOI: 10.13866/j.azr.2022.06.25

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