| 红壤地区镁肥对作物的效应 |
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| 引用本文： | 李伏生.红壤地区镁肥对作物的效应[J].生态环境,2000,9(1). |
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| 作者姓名： | 李伏生 |
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| 作者单位： | 广西大学农学院,南宁,530005 |
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| 基金项目： | 中国科学院南京土壤研究所与美国、法国合作课题，并受广西大学资助!（科基金1701） |
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| 摘 要： | 土壤交换性镁量愈低，镁肥对作物的增产效果愈显著。作物地上部含镁量和吸镁量也决定于交换性镁量大小；交换性镁水平与含镁量和吸镁量呈显著正相关。因此，土壤交换性镁能较好地反映土壤镁素对作物的有效性。此外，作物对镁肥的反应还受土壤交换性钾和钾肥施用的影响。当土壤交换性镁低于５０ ｍｇ／ｋｇ~（－１），交换性 Ｋ／Ｍｇ比大于 １．３时，施用镁肥效果明显。
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| 关 键 词： | 镁 镁肥 交换性K/Mg比 红壤 |
Effects of Magnesium Fertilizer on Crops in Red Soil Regions of China |
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| LI Fu-sheng.Effects of Magnesium Fertilizer on Crops in Red Soil Regions of China[J].Ecology and Environmnet,2000,9(1). |
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| Authors: | LI Fu-sheng |
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| Institution: | Faculty of Agriculture Guangxi University Nanning 530005 China |
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| Abstract: | The lower the content of soil exchangeable magnesium is, the more significantly crops respond to Mg fertilizer. The Mg content and uptake of crops are also dependent on the level of exchangeable Mg. The correlation between exchangeable Mg and the Mg content of crop or Mg uptake of crop is remarkably different. Therefore, soil exchangeable Mg has good indication to soil Mg availability to crops. Simultaneously, soil exchangeable K and K fertilization also affect the responses to Mg fertilizer. When the soil exchangeable Mg is below 50 mg/kg~(-1) and exchangeable K/Mg ratio exceeds l.3, the crops respond to Mg fertilizer remarkably. |
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| Keywords: | magnesium magnesium Fertilizer exchangeable K/Mg ratio red soil |
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