| Effect of continuous cropping on morphology and physiological characteristics of potato root and leaf |
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| DOI：10.7606/j.issn.1000-7601.2014.04.004 |
| Key Words: potato continuous cropping root morphology physiolo
gical resistance |
| Author Name | Affiliation | | ZHANG Wen-ming1,2, QIU Hui-zhen1,2, LIU Xing1,2, ZHANG Jun-lian2,3,4, WANG Di2,3,4 | (1.甘肃农业大学资源与环境学院， 甘肃 兰州 730070； 2.甘肃省干旱生境作物学重点实验室， 甘肃 兰州 730070； 3.甘肃农业大学农学院， 甘肃 兰州 730070； 4.甘肃省作物遗传改良与种质创新重点实验室， 甘肃 兰州 730070) |
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| Abstract: |
| This study aims to investigate the effect of continuous cropping on growth and yield of potato, employing field experiment conducted at Tiao Shan farm, Jing Tai country in 2010. The results showed that dry weight of root and shoot significantly reduced with the increasing years of continuous cropping. However, total root length, root surface area, root numbers and root-to-shoot ratio significantly increased. Compared with rotation cropping, total root length, root surface area, root numbers and root-to-shoot ratio increased by 39.35%, 26.60%, 31.67%, and 70.90% after five years of continuous cropping, respectively. The activity of leave MDA significantly increased, while those of SOD, POD and CAT increased at first for the early year but decreased sharply at later years of continuous cropping. After three years of continuous cropping，the activity of leave MDA significantly increased, while the activity of SOD, POD and CAT decreased sharply. Tuber yield had no significant difference between one year or two years of continuous cropping, while it decreased more than 45% after three years of continuous cropping. The result shows that the threshold of potato continuous cropping may be at least two years, when the positive effect of promoting root growth begins to emerge. |
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