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| Relationships between maize growth and the pH,exchangeable aluminum and calcium of red soils derived from different parent materials |
| Received:February 16, 2017 |
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| KeyWord:maize(Zea mays L.);red soil;soil pH;exchangeable aluminum;exchangeable calcium |
| Author Name | Affiliation | E-mail | | LIANG Wen-jun | College of Agriculture, Yangtze University, Jingzhou 434025, China
National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Reginal Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | CAI Ze-jiang | National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Reginal Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | SONG Fang-fang | National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Reginal Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | ZHOU Shi-wei | National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Reginal Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | AI Tian-cheng | College of Agriculture, Yangtze University, Jingzhou 434025, China | 619637248@qq.com | | XU Ming-gang | National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Reginal Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | mgxu@caas.ac.cn |
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| Abstract: |
| In China, red soils occur in the tropical and subtropical areas south of the Yangtze River. Soil damage and nutrient deficiency are two main factors liming agricultural production in this region. In order to explore the mechanism of red soil acid damage, the red soils developed from three parent materials were collected and used for a maize potting experiment after their acid content had been adjusted to different levels. There was a critical pH value(approx 5.5) for maize biomass, which differed slightly in red soil derived from different parent materials. The biomass of maize increased linearly with an increase in soil pH when the soil pH was less than the critical value, whereas the biomass remained essentially unchanged with increases in soil pH above the critical value for quaternary red clay, and showed a slight decrease for soils derived from plate shale and red sandstone. The exchangeable aluminum content in the soils showed a linear decreased with an increase in soil pH below the critical pH value, its content is low and near to zero, and remained essentially unchanged when soil pH was higher than the critical value. The exchangeable calcium content in quaternary red soil increased linearly with an increase in soil pH when the soil pH was less than the critical value, whereas for soils derived from plate shale and red sandstone, the exchangeable calcium content remained essentially unchanged and at low levels. When soil pH was higher than the critical value, the exchangeable calcium content in the plate shale and red sandstone soils increased linearly with an increase of soil pH. The critical values of soil pH, exchangeable aluminum(1/3Al3+), and exchangeable calcium(1/2Ca2+) are, respectively, 5.48, 0.14 cmol·kg-1, and 4.59 cmol·kg-1 for quaternary red clay soil; 5.82, 0.16 cmol·kg-1, and 5.46 cmol·kg-1 for plate shale soil; and 5.54, 0.13 cmol·kg-1, and 3.06 cmol·kg-1 for red sandstone soil. |
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