| Effects of cropping system of cotton on soil chemical properties in oasis in Tarim |
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| DOI：10.7606/j.issn.1000-7601.2012.03.20 |
| Key Words: cotton field crop rotation continuous cropping soil nutrient |
| Author Name | Affiliation | | LUO Xinning | College of Plan Seience， Tarim Uniuersity, Alar, Xinjiang
843300, China | | ZHU Youjuan | Akesu Vocational and Technical College， Akesu, Xinjiang
843000, China | | ZHANG Hongyong | Markit Base of PLA Xinjiang Military Region， Markit, Xinjiang 844600, Chia | | WAN Sumei | College of Plan Seience， Tarim Uniuersity, Alar, Xinjiang
843300, China |
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| Abstract: |
| In order to study the effects of cropping systern on nutrient characteristics of cotton field in Tarim oasis, both crop rotation and continuous cropping duration as test faetors were adopted to seek the changes of soil chemical prop-erties. The results showed that short-term rotation had no influence on soil nutrient properties. Cotton cropping-year was the main factor to influence the content of nutrition in different soil depth. Available nitrogen in 0~20 cm soil layer with 3, 8, 10 and 15 years of continuous cropping was 40.60, 48.75, 51.96 mg/kg and 44.35 mg/kg; available phos-phorus was 10.16, 26.72, 27.00 mg/kg and 23.37 mg/kg; available potassium was 184.70,142.60,130.20 mg/kg and 105.56 mg/kg; and organic matter content was 10.43 g kg, 12.10 g/kg,12.93 g/kg and 13.56 mg/kg respec-tively. Soil available nitrogen, available phosphorus, organic matter content reduced with the increase of soil depth from vertical distribution, regardless of rotation types and cultivation years. There was a trend that available potassium contend
raised with the increase of soil depth. Long-term continuous cropping of cotton increased the level of soil available nitro-gen, available phosphorus and organic matter content while reduced available potassium content in deep soil; Soil avail-able nitrogen and phosphorus content reached maximum of 52.35 mg/kg and 27.45 mg kg after 8∽10 years of continu-ous cropping. |
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