What is the difference between common potash fertilizers
Potassium sulfate is white or light yellow crystal, soluble in water, and has low hygroscopicity. It can be used as base fertilizer or top dressing. It is suitable for all kinds of crops, especially those that avoid potassium chloride and potassium.
Potassium nitrate is white powder or crystal, soluble in water, and has low hygroscopicity.
Potassium dihydrogen phosphate is colorless to white crystal or crystalline powder, soluble in water and stable in air. At present, it is mostly used for seed soaking and extra-root fertilizer application.
Biological potassium fertilizer can be used for seed dressing, dipping roots, and can also be applied to the soil. The application of fungicide actually inoculates the roots of crops, allowing silicate bacteria to release potassium, phosphorus, silicon, iron and other elements in the soil around the roots for absorption and utilization by the roots.
What to pay attention to when applying potassium fertilizer
The application of potash fertilizer due to soil should be first placed in areas with severe potassium deficiency. From the perspective of soil texture, the content of available potassium in sandy soil is often low, and potassium fertilizer should be added; the content of available potassium in clay soil is often high, which can be applied less or not. Potassium sulfate can be applied to soils deficient in potassium and sulfur, and potassium chloride cannot be applied in saline land.
Because crops are applied in rainy areas or areas with irrigation conditions and good drainage, potassium chloride can be applied to most crops, and a few economic crops are not suitable for improving quality.
Reasonable mix is ​​better for tobacco, sugar crops and fruit trees. Because of the high cost of potassium sulfate, potassium sulfate can be used in high-efficiency economic crop fields. In general field crops, except for a few chlorine-sensitive crops, cheaper chlorine should be used. Potassium.
How to apply potash fertilizer
When crops requiring potassium are in the rapid growth period, foliar spray is best. When the root system of the crop is developed, it is best to apply it deeply. Commonly used conservation tillage leaves more crop residues on the surface of the soil, which also results in higher concentration of potassium in the surface of the soil and cannot penetrate into the soil. When the soil moisture is good, these potassium can infiltrate smoothly, but when the soil is dry, it will limit the absorption of potassium. Because the crop takes root deeper below the soil layer richest in potassium in order to get enough water, this misalignment will cause the crop to lack potassium. In this case, deep application of potassium fertilizer can significantly increase the availability of potassium.
The location of other nutrients also determines how much potassium is accessible to the crop root system. Nitrogen and phosphorus can stimulate the root branches of crops, where the concentration of these nutrients is higher, the root ratio will be higher. Applying potassium fertilizer in the same ditch as nitrogen fertilizer and phosphate fertilizer can increase the chance of roots coming into contact with potassium.
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