| 摘要: |
| 将肥田萝卜分别置于全磷、低磷、无磷的营养液中生长10d后，收集根洗液并加入已培养60d的酸性土壤样品中浸提。测定结果表明，不论土壤中是否加入磷矿粉，低磷营养液中培养的肥田萝卜的根洗液（含根分泌物）浸提的土壤有效磷含量都最高，高于用无磷及全磷根洗液浸提的，也高于用去离子水浸提的。土壤加入磷矿粉培养后可以大量增加土壤有效磷的浸提量，其中用低磷根洗液浸提的土壤有效磷的含量增加最明显。用低磷根洗液浸提的酸性土壤有效铁含量也最高。 |
| 关键词: 肥田萝卜,根洗液,酸性土壤,磷矿粉,有效磷 |
| DOI： |
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| 基金项目:国家自然科学基金!39425013 |
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| Effects of Radish Root Exudates on Mobilizing Low Grade Rock Phosphate in Acid Soil |
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| Abstract: |
| Radish plants were grown for 20 days in a nutrient solution. The root washings were collected and added into the acid soil where plant had grown for 60 days. The results showed that the highest soil available phosphorus content was extracted by the root washings collected under low phosphorus condition more pronounced with the addition of rock phosphate to the sterillzed soil. The highest available Fe content in acid soil also was extracted by root washings collected under low phosphorus condition, but the available Fe content extracted by root washings collected under boxh condition and normal phosphorus supply condition was only slightly higher than that extracted by deionized water. However, the tendency was not influenced by the soil sterilization and the rock phosphate addition. |
| Key words: radish,root exudates,acid soil,rock phosphate,root washings, |
