The Causes and Countermeasures of Decreased Available Potassium Content in Soil

Many years of soil location monitoring in our county showed that the content of soil available potassium showed a significant downward trend. The average content of soil available potassium was 105 mg/kg in the county in the year 82 and 98 mg/kg in the year 90. The average annual decline was 1 mg/kg. The average content of soil available potassium in the county was 88 mg/kg in 1995, which was a drop of 2 mg per year from the average in 90 years. /kg.
One, the reason for the decline
1. The input ratio of nitrogen, phosphorus, and potassium fertilizers is out of balance, the input of potash fertilizer is insufficient, and soil potassium cannot be supplemented for a long time.
2. The promotion of high-yielding species has increased the absorption of soil potassium by crops.
3. The potassium that the crop has taken away from the soil is far greater than the amount returned, and the amount of straw that is returned to the soil is about 60-80%.
4. The increase in the multiple cropping index and the increase in intensification have increased the depletion of potassium in crops.
Second, countermeasures
1. Add organic fertilizer. Because of the high content of available potassium in organic fertilizers, the content is generally around 130mg/kg, which is a traditional method to increase the content of available potassium in soil.
2. Vigorously promote straw returning technology. Because the straw is rich in potassium, promoting the return of straw to the soil can restore the rapid recovery of potassium. According to laboratory tests, 300 kg of wheat straw per acre and 600 kg of corn straw can increase soil potassium by 3-5 mg/kg.
3. Deepen the sunburn. This measure can improve soil structure, coordinate soil water, fertilizer, gas, and heat conditions, and facilitate the release of soil potassium.
4. Promote balanced fertilization techniques. Increase the input of potash fertilizer so that the input ratio of nitrogen, phosphorus, and potassium fertilizers approaches 1:0.42:0.42. The general soil available potassium content is 60-80mg/kg K2O 8-9kg per acre, and the soil available potassium content is 80-100mg/kg K2O 6-8kg per acre.

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