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首页> 外文期刊>International journal of soil science >Vertical Distribution of Magnesium in the Laterite Soils of South India
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Vertical Distribution of Magnesium in the Laterite Soils of South India

机译：印度南部红土土壤中镁的垂直分布

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High levels of exchangeable potassium or ammonium can interfere with the uptake of magnesium by crops. This antagonism is a major concern in some tea growing soils with low magnesium. Soil samples were collected from tea fields and a nearby forest, at various depths. The pH of tea soil ranged between 4.60 and 4.88 and the values were lower when compared to the forest soils. This could be due to the continuous application of nitrogen containing fertilisers. Water soluble magnesium content was higher in forest area when compared to the tea fields which could be attributed to the application of magnesium in the form of carbonate once in four year. Total magnesium was estimated in both cultivated and forest soils and the amount of total magnesium was higher in forest area when compared to the cultivated area. The total magnesium content in forest area ranged between 370 and 1550 mg kg-1, while in tea soils it ranged between 228 and 968 mg kg-1. The available magnesium content ranged between 10 and 40 mg kg-1 in tea soil and 20 and 70 mg kg-1 in forest soil. Water soluble magnesium had negative correlation with pH of the tea soils. There existed a linear relationship between water soluble magnesium and electrical conductivity of cultivated soils. The magnesium status of tea soils is generally low when compared to the forest area due to continuous exploitation of this nutrient by tea plants. This study confirmed that there is need for soil application of magnesium fertilizer in tea fields to preserve the magnesium status.
机译：高水平的可交换钾或铵离子会干扰农作物对镁的吸收。这种拮抗作用是一些低镁茶生长土壤中的主要问题。从茶田和附近森林的不同深度收集土壤样品。茶土的pH值在4.60至4.88之间，与森林土壤相比，pH值较低。这可能是由于连续施用含氮肥料造成的。与茶园相比，森林地区的水溶性镁含量更高，这可能是由于每四年以碳酸盐的形式施用镁。估计耕地和森林土壤中的总镁含量，与耕地相比，森林面积中的总镁含量更高。森林区域的总镁含量在370至1550 mg kg -1 之间，而在茶土中，镁的总含量在228至968 mg kg -1 之间。茶园土壤中的有效镁含量为10至40 mg kg -1 ，森林土壤中的有效镁含量为20至70 mg kg -1 。水溶性镁与茶土的pH呈负相关。水溶性镁与耕作土壤的电导率之间存在线性关系。与森林面积相比，茶土的镁含量通常较低，这是由于茶树不断吸收这种养分。这项研究证实，在茶田中需要在土壤中施用镁肥以保持镁的状态。

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