How to control heavy metal pollution in cultivated land? Experts recommend changing the application of alkaline fertilizer
At the seminar on structural reform of fertilizer supply side in Hubei Province held on December 12th, some experts in the field of soil and fertilizer proposed that some agricultural products in some places have detected harmful heavy metals exceeding the standard, except for the fact that the soil suffers from a small amount of imported heavy metal pollution. It is mainly caused by the serious acidification of the soil, which leads to the activation of heavy metals in the soil background and is absorbed by the crops. The strategy of governance is to apply acid fertilizer as alkaline fertilizer to curb the acidification trend of cultivated soil, thereby passivating heavy metals in the soil. At the meeting of the day, Huang Heping, a researcher at the Provincial Fertilizer Station, asked the experts: How to prevent heavy metals in the soil from the perspective of fertilization, and thus avoid the risk of “cadmium rice†that has appeared in other provinces? Fan Xiaolin, director of the Department of Plant Nutrition, School of Resources and Environment, South China Agricultural University, answered this question in detail. He said that all kinds of heavy metals have always existed in the soil background, and now they are entering the local agricultural products, because the acidification of the soil in the south is serious, resulting in enhanced activity of heavy metals and being absorbed by crops. They have sampled and tested in many places and found that the average pH value of cultivated land in southern China has dropped from about 6.5 40 years ago to 5.0 and more than 4 points in the present, indicating that the acidification of cultivated land in southern China is more serious. He also said that if the added acid in the soil is converted into a physical object, it is equivalent to using a lot of trains to pour sulfuric acid into the ground. According to Du Changwen, a researcher at the Institute of Soil Science of the Chinese Academy of Sciences, part of it comes from the deposition of sulfur and nitrogen in the atmosphere. China’s current annual emissions of sulfur and nitrogen exceed 100 million tons, and it will become acidified when it settles into the soil. The ion, another part is derived from the application of chemical acid and physiological acid fertilizer. For example, nitrogen fertilizer is all physiological acid fertilizer except nitrate nitrogen. The compound fertilizer is mostly chemical acid fertilizer. The application of quicklime is the old way to cure acidification, but it is no longer applicable. First, under the new environmental protection policy, enterprises that burn lime are gradually shut down. Second, the sequelae of applying lime are very obvious. After neutralizing the acid ions in the soil, it is produced. The new substance calcium carbonate will cause the soil to become knotted. Experts suggest that to control soil acidification, while doing a good job in reducing sulfur and nitrogen in the environment, we must also carry out structural reforms on the fertilizer supply side to give fertilizers the function of regulating acid. According to industry sources, some research institutes have been vigorously developing such fertilizers. After testing and demonstration in Hunan and Jiangsu, the cadmium in the soil has been passivated, and the cadmium content of rice produced has fallen to a safe range. . He also revealed that increasing the pH value of cultivated soil is a long-term process. After 17 consecutive seasons of applying this alkaline fertilizer on the leek floor, the original acidic soil has not yet become neutral. This article URL: How to deal with heavy metal pollution in cultivated land? Experts recommend changing the application of alkaline fertilizer Our honey include polyflora honey, acacia honey, sunflower honey, buckwheat honey, linden honey, vitex honey etc. Our 100% Pure Honey,Mixed-Flowers Honey,Polyfloral Honey,Acacia Honey,Multi-flower Honey,Chaste Honey Easy Food (Jiaxing) Co., Ltd. , https://www.jxeasyfood.com
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