Influencing Factors Of Potassium Fertilizer

The application of potassium fertilizer is not only dependent on the potassium supply capacity of the soil, but also affected by factors such as crop species, agricultural production level, climate and soil conditions. The content, form, transformation and potassium supply capacity of potassium in soil are the important basis for the rational distribution and application of potassium fertilizer. The total potassium content of the soil varies greatly, generally 0.1% to 3%, with an average of about 1%.
Potassium in soil includes 3 forms: ① Mineral potassium. It mainly exists in the coarse-grained part of the soil, accounting for about 90% of the total potassium, and it is extremely difficult for plants to absorb. ② slow-acting potassium. Accounting for about 2% to 8% of the total potassium, it is the source of rapid release of potassium in the soil. ③ available potassium. Refers to the replacement potassium adsorbed on the surface of the soil colloid and the potassium ions in the soil solution. Plants mainly absorb potassium ions in the soil solution. The potassium nutrient level of plants in the current season is mainly determined by the content of available potassium in the soil. Generally, the available potassium content only accounts for 0.1% to 2% of the total potassium, and its content is not only affected by tillage, fertilization, etc., but also controlled by the slow-release potassium storage and conversion rate of the soil.