论文部分内容阅读
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。
The fat radish were placed in total phosphorus, phosphorus, phosphorus-free nutrient solution growth 10d, the root wash was collected and added to the acid soil samples have been cultured for 60 days leaching. The results showed that the content of soil available phosphorus in the root lotion (root exudates) of the fertile radish cultivated in the low-phosphorus nutrient solution was the highest, irrespective of whether the phosphate rock was added into the soil, Liquid leaching is also higher than leaching with deionized water. After adding phosphate rock into the soil, the amount of soil available phosphorus could be greatly increased, and the content of available phosphorus in the soil extracted with low phosphorus root lotion increased most obviously. The available iron content of acidic soil extracted with low-phosphorus root lotion is also the highest.