| Effects of different years of continuous cropping on cotton root morphology and yield |
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| DOI：10.7606/j.issn.1000-7601.2020.02.19 |
| Key Words: cotton continuous cropping years root growth yield Xinjiang |
| Author Name | Affiliation | | YE Zupeng | Key Laboratory of Northwest Oasis Agriculture Environment, Ministry of Agriculture, College of Pratacultural and Environmental Sciences, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | BAI Xuming | Key Laboratory of Northwest Oasis Agriculture Environment, Ministry of Agriculture, College of Pratacultural and Environmental Sciences, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | CHEN Bolang | Key Laboratory of Northwest Oasis Agriculture Environment, Ministry of Agriculture, College of Pratacultural and Environmental Sciences, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| Continuous cropping is an important obstacle factor for cotton growth, and exploring the response characteristics of cotton roots to continuous cropping length will be conducive to improve the adaptability of cotton to soil. In this paper, cotton with continuous cropping for 5, 10 and 20 years as the research object in typical cotton areas of Xinjiang (cotton planting areas in Manas County) was studied. The root distribution and morphological characteristics of cotton in different planting years were researched by means of field root drill sampling and image scanning. The results showed that the roots were concentrated in the surface layer, and the root mass accounted for 74.38%~87.08% of the total root mass in 0~10 cm soil layer. Continuous cropping promoted dry root weight, which increased by 57.16% and 50.80%, respectively, after 10 years and 20 years continuous cropping compared with the 5 years. Continuous cropping significantly increased the root length density and root surface area index of cotton. The total root length in the 0~0.4 mm diameter range of continuous cropping for 10 years and 20 years was significantly increased by about 0.79~2.76 times and 0.07~1.46 times compared with that of continuous cropping for 5 years, respectively. The yield of 10 year continuous cropping (average yield was 5 633.90 kg·hm-2) was significantly higher than that of 20 years and 5 years continuous cropping (P<0.05), which increased by 14.96% and 26.53%, respectively. Controlling continuous cropping years (10 years) in Xinjiang did not inhibit the growth of cotton root system in a certain time domain, but improved root length density and root surface area index, and then promoted cotton yield. However, after cotton cultivation exceeded a certain period of time (10~20 years), continuous cropping obstacles occurred, which might affect the growth and yield of cotton root system. However, continuous cropping obstacles might occur after cotton planting for more than a certain period of time (10~20 years), which might affect root growth and yield. |
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