Soil pH Adjustment Measures 1. The most fundamental measure to increase the pH of organic fertilizers to regulate soil pH is to improve soil buffering performance. Soil buffering is closely related to the content of humus in soil, and humus is mainly derived from organic matter. Therefore, organic fertilizer must be emphasized in agricultural production. 2. Reasonable use of chemical fertilizers Based on the application of organic fertilizers to improve soil buffering performance, chemical fertilizers should be reasonably applied according to the degree of soil acidity and alkalinity and fertility. In general, acidic soils are selected from alkaline fertilizers such as ammonium bicarbonate and ammonia, and phosphate fertilizers are selected from calcium, magnesium, and phosphate fertilizers. Alkaline soil, choose to apply soluble acidic fertilizers, such as ammonium chloride, superphosphate and so on. Urea is a neutral organic nitrogen fertilizer, can be applied to the acid-alkali soil, but after 3-5 years after the application of irrigation, to prevent loss, improve fertilizer efficiency. 3. Appropriate application of lime should be applied to soils with strong acidity (below pH 5.5), high clay weight, and high organic matter content. Lime dry land can be used slightly more than paddy fields. Generally about 50-100 kg per mu per year, and declining year by year, the first 4 - 5 years can be suspended for 1-2 years. Strong alkaline soil, can be applied to gypsum (calcium sulfate) 15-25 kg, adjust its alkaline. Excerpted from China Agricultural Press>
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