论文部分内容阅读
本文通过室内分析和盆栽试验研究了我国红壤区土壤镁素的释放和固定.结果表明:供试土壤镁素的释放和固定能力很低.不同土壤非交换性镁的释放难易程度不同,且不能满足作物对镁的要求.红壤对镁肥的固定能力很弱,一般固定率低于10%.土壤镁素有效性受石灰和水分状况所左右.施用石灰后,交换性镁的固定量增加,非交换性镁的释放减少.干湿交替也会增加镁的固定.
In this paper, the release and fixation of soil magnesium in red soil region of China were studied through laboratory analysis and pot experiment.The results showed that the release and fixation ability of soil magnesium in the soil were very low.The release of non-exchangeable magnesium in different soil was different Can not meet the requirements of the crop of magnesium.Red soil fixation capacity of magnesium fertilizer is very weak, the general fixed rate of less than 10% .Material availability of magnesium affected by the lime and water conditions.Utilizing lime, the exchange of magnesium increased fixed , The release of non-exchangeable magnesium is reduced, and the wet-dry alternation also increases the fixation of magnesium.