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土壤中铝的形态和化学性质对高度风化的酸性土壤的肥力特性具有重要影响,因为高浓度的铝往往是有毒的。在这类土壤上施加石灰对作物有良好效应,主要是由于中和了土液中的可溶性铝和交换性铝。高度风化的酸性土壤固磷能力强,是限制作物产量的又一因素。为了有效地利用土壤中的磷,对这些土壤施加石灰是必要的,因为铝的毒性抑制了植株对磷的吸收和运移。但据报道,施石灰对土壤中磷酸盐溶解度的影响范围可从有益直至有害。要防止磷被大量吸附,一种引人注意的做法是对土壤施用磷以外的物质(如含硅的化合物),以占据土壤胶体的吸附点。硅特别
The morphological and chemical properties of aluminum in soils have a major impact on the fertility characteristics of highly weathered soils, as high levels of aluminum tend to be toxic. The application of lime to such soils has a good effect on crops mainly due to the neutralization of soluble aluminum and exchangeable aluminum in soil fluids. Highly weathered acidic soils have a strong ability to fix phosphorus and are another factor that limits crop yields. In order to effectively utilize the phosphorus in the soil, it is necessary to apply lime to these soils, because the toxicity of aluminum inhibits the plant’s absorption and transport of phosphorus. However, it has been reported that the effect of lime on the solubility of phosphate in the soil can range from beneficial to harmful. An attractive approach to prevent phosphorus from being adsorbed in large amounts is to apply a substance other than phosphorus (such as a silicon-containing compound) to the soil in order to occupy the adsorption point of the soil colloid. Special silicon