| Research on early warning value of salt tolerance of cotton with drip irrigation under mulch |
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| DOI：10.7606/j.issn.1000-7601.2009.04.27 |
| Key Words: drip irrigation under mulch secondary salinization cotton growth early warning value |
| Author Name | Affiliation | | SUN Zhaojun | College of Agronomy, Shihezi University, Shihezi, Xinjiang 832003, China
Key Laboratory Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi, Xinjiang 832003, China | | LI Luhua | College of Agronomy, Shihezi University, Shihezi, Xinjiang 832003, China
Key Laboratory Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi, Xinjiang 832003, China | | ZHANG Wei | College of Agronomy, Shihezi University, Shihezi, Xinjiang 832003, China
Key Laboratory Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi, Xinjiang 832003, China | | ZHANG Xiaowei | Institute of Agricultural Science and Technology of Agriculture Division No. 6, Xinjiang Production and Construction Group, Wujiaqu, Xinjiang 831300, China | | YANG Zhongping | Xinhu Farm of Agriculture Division No. 6, Xinjiang Production and Construction Group, Wujiaqu Xinjiang 831300, China | | CHANG Shiwei | College of Agronomy, Shihezi University, Shihezi, Xinjiang 832003, China |
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| Abstract: |
| Effect of secondary salinization on the growth of cotton was studied by choosing different cotton fields with drip irrigation under mulch with the salinity gradient in Xinjiang, then the condition for early warning on its basis was investigated. The results showed that plant height, dry matter weight and leaf area index showed a significant negative correlation with soil salinity respectively in different growth period. Cotton is resistant to salinity, because the aboveground growth and yield of cotton were not influenced by the low soil salinity. The yield reduction was due to a reduction in the number of available bolls. The salt tolerance level of cotton varied in different growth period. The warning degree of each cotton field tended to reduce gradually with the growth period process. The soil salinity below 0.6 dS/m would not harm the growth of cotton in every growth period, while the soil salinity above 2.8 dS/m would result in a serious impact to the growth of cotton in early growth periods, and in boll opening period the soil salinity around 2.8 dS/m did not cause harm to the growth of cotton. |
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