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土壤的酸碱性是土壤的一个重要特性,也是影响土壤肥力的一个重要因素,它可引起土壤的一些性质变化,而直接影响农作物的生长。一般作物在中性、弱酸性、弱碱性的土壤中生长最为适宜。如果过酸、过碱都会影响农作物生长,就应该适当地对土壤进行改良,把土壤的酸碱度调解到作物生长最适宜的范围内,测定土壤酸碱度,可用石蕊试纸。这种纸有红色和兰色两种,如红色试纸变为兰色,土壤就是碱性;兰色试纸变为红色,土壤就是酸性;试纸不变色即为中性。
Soil acid-base is an important characteristic of soil and is also an important factor affecting soil fertility. It can cause some changes of soil properties and directly affect the growth of crops. General crops in neutral, weakly acidic, weakly alkaline soil growth is most appropriate. If too much acid, over-alkali will affect the crop growth, we should properly improve the soil, the soil pH to mediate the most appropriate crop growth within the scope of determination of soil pH, available litmus paper. This paper has two kinds of red and blue, such as red test paper turns blue, the soil is alkaline; blue test paper turns red, the soil is acidic; test paper is neutral is not discoloration.