| Effect of red soil penetration resistance on growth of summer maize |
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| DOI：10.7606/j.issn.1000-7601.2018.01.08 |
| Key Words: red soil soil penetration resistance summer maize seasonal drought red soil |
| Author Name | Affiliation | | LUO Min | Chongqing Institute of Medicinal Plant Cultivation·Institute of Medicinal Plant Development, Chinese Acadesmy of Medical Sciences, Chongqing 408435, China
Ministry of Agriculture Key Laboratory of Arable Land Conservation of Middle and Lower Reaches of Yangtze River, Hua zhong Agricultural University, Wuhan, Hubei 430070, China | | DENG Cai-fu | Chongqing Institute of Medicinal Plant Cultivation·Institute of Medicinal Plant Development, Chinese Acadesmy of Medical Sciences, Chongqing 408435, China | | CHEN Jia-zhou | Ministry of Agriculture Key Laboratory of Arable Land Conservation of Middle and Lower Reaches of Yangtze River, Hua zhong Agricultural University, Wuhan, Hubei 430070, China | | GAO Yue | Ministry of Agriculture Key Laboratory of Arable Land Conservation of Middle and Lower Reaches of Yangtze River, Hua zhong Agricultural University, Wuhan, Hubei 430070, China | | GAO Bing-ke | Ministry of Agriculture Key Laboratory of Arable Land Conservation of Middle and Lower Reaches of Yangtze River, Hua zhong Agricultural University, Wuhan, Hubei 430070, China |
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| Abstract: |
| In order to mitigate the effects of seasonal drought on agricultural production in red soil region of southern China, effective measures were studied to reduce soil penetration resistance (PR). The soil bulk density of 1.1, 1.3 g·cm-3 and 1.5 g·cm-3 simulated antecedent soil resistance in indoor pot, and four tillage measures, including deep tillage, conventional tillage, no-tillage and compaction were set to control soil resistance in field. The influence of red soil penetration resistance to roots morphology index, plant growth and yield were explored by comprehensive research on indoor pot and field experiments. The results showed that, during the mild and moderate droughts, the maize growth was greatly affected by the red soil penetration resistance. The orders were D1.1＞D1.3＞D1.5 of root length, root surface area and root volume, but the root diameter was the opposite. And the orders were D＞C＞N＞P of the ground growth indexes and yield. The root morphology indicators except the root diameter, plant growth indicators and the yield were all negatively related to soil penetration resistance. Maize growth and yield of deep tillage were significantly higher than no-tillage and compaction. The soil PR changed root growth and decreased plant growth and yield. When the red soil PR increased 1.0 MPa, the grain yield reduced 1 787.1 kg·hm-2. As to the red soil in this study, deep tillage reduced its penetration resistance remarkably and thus mitigated the detrimental effects of drought. But no tillage practice resulted in the high soil penetration resistances, thus reducing crop growth directly. |
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