Acid soil improvement method

What is the harm of acidic soil to crops? What are the methods of acid soil improvement? Netizens with knowledge are also asked to help introduce that after many years of fertilizer application, the soil generally tends to be acidic or salty, which has a negative impact on the growth of crops, so the planting network has sorted out the harm of acidic soil and improvement methods. The following detailed list for netizens' reference. The harm of acid soil: first, acid soil will reduce the number of soil beneficial microorganisms and inhibit the growth and activity of beneficial microorganisms, thus affecting the decomposition of soil organic matter and the cycle of nitrogen, phosphorus, potassium, sulfur and other elements in soil. Moreover, it will also cause the breeding of bacteria and the increase of root diseases, such as soil acidification will aggravate the breeding and spread of crop root nematode disease and so on. Second, acidic soil will cause the fixation of nutrient elements, for example, when the soil pH value is lower than 6, the fixation rate of phosphorus in red soil increases linearly with the decrease of pH. Due to the fixation of phosphorus, the effective utilization of phosphorus is greatly reduced, which has become one of the serious problems affecting the development of agriculture. Third, acidic soil will promote the release, activation and dissolution of some toxic elements (such as aluminum ions). For example, aluminum ions in soil will have a toxic effect on the growth of wheat seedlings, and also have a great impact on the relative yield of barley. With the increase of exchangeable aluminum content in soil, the relative yield of barley decreased linearly. And planting crops on acidic soil is not easy to complete seedlings, often forming rigid seedlings and old seedlings, resulting in low yield and poor quality. Acid soil improvement method: method 1, using quicklime to neutralize acid, 40-50 kg per mu, evenly applied during soil preparation. After that, the annual application rate was reduced by 1 stroke and 2, until it was transformed into neutral or slightly acidic soil. The function of lime nitrogen