Partial application of phosphorus causes soil compaction, certain medium and trace elements are fixed, and deficiency syndrome occurs. Because the phosphorus that can not be absorbed by wheat is enriched in the soil, its phosphate ions combine with the cations of trace elements in calcium and magnesium in the soil to form insoluble phosphate, which wastes the phosphate fertilizer and destroys the soil aggregate structure. Soil compaction. Therefore, do not apply phosphate fertilizer (such as diammonium phosphate) on the base fertilizer.
When applying phosphate fertilizer, the ternary compound fertilizer with higher phosphorus content is selected on the base fertilizer, and the phosphorus is applied at one time. For example, Shandong and Hebei winter wheat areas can choose 20-20-5, 20-20-7, 20-20-8, 20-20-10 and other formula 40-50 kg / mu, Henan North Jiangsu North wheat winter wheat area can choose 22 Formulations of -14-10, 25-13-10, 27-12-10, 27-13-10, etc. 40-50 kg/mu.
When diammonium and low-nitrogen high-phosphorus compound fertilizer are used on the base fertilizer, in addition to the use of 30-40 kg of mu, the urea should be increased by 10 kg per mu to prevent the phenomenon of yellowing caused by straw rot and seedlings.
Since 2008, the price of potash has skyrocketed, resulting in less and less potassium in agricultural production. This situation has lasted for nearly 4 years, and in the past two years, the lodging of summer maize and winter wheat in North China has increased, which indicates that potassium supplementation has become crucial to some extent.
Returning straw can provide some potash. If the base fertilizer is 40-50 kg of ternary compound fertilizer, it is not necessary to select the formula of 19-19-19, 18-18-18 with a particularly high potassium content. First, the price of fertilizers with high potassium content is particularly expensive this year, increasing costs; second, excessive potassium fertilizer, can not be used, too wasteful.
It is recommended to choose a high-nitrogen and high-phosphorus potassium-type ternary compound fertilizer with a potassium content of about 7% as the base fertilizer. The dosage is 40-50 kg/mu, such as: 20-20-7, 20-20-8, 20-20-10 Wait. After the year, return to the green period, select the nitrogen and potassium compound fertilizer with potassium content of 5%-10% for topdressing, the dosage is 20-30 kg/mu, such as 30-0-5, 30-0-10. Potassium fertilizer can be applied twice, which can also improve the utilization rate of potassium fertilizer, and ensure disease resistance and lodging resistance and high yield.
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