Compound fertilizer is suitable for base fertilizer
A large number of tests have shown that both binary and ternary compound fertilizers are better based on basic application. This is because the compound fertilizer contains nitrogen, phosphorus, potassium and other nutrients. In the early stage of the crop, it is especially sensitive to phosphorus and potassium. Phosphorus and potassium fertilizers are required to be applied as base fertilizer. Compound fertilizer should not be used for seedling fertilizer and mid-late fertilizer to prevent greed. The decomposition of compound fertilizer is slow. For crops that use compound fertilizer as base fertilizer during sowing, according to the fertilizer requirement of different crops, quick-acting nitrogen fertilizer should be supplemented in time to meet the nutritional needs of crops.
The difference in compound fertilizer concentration is large, pay attention to choose the appropriate concentration.
At present, most compound fertilizers are configured according to the average nutrient status of soil types in a certain region and the proportion of crops required for fertilizer. There are high, medium and low concentration series of compound fertilizers on the market. Generally, the total concentration of total nutrients is between 25% and 30%, the medium concentration is between 30% and 40%, and the high concentration is above 40%. It is necessary to use economical and efficient compound fertilizers due to different regions, soils and crops. Generally, high-concentration compound fertilizer is used in economic crops, with excellent quality, less residue and high utilization rate. The concentration of compound fertilizer is high, and it is necessary to avoid direct contact between seeds and fertilizer. The compound fertilizer has a high nutrient content. If it is in direct contact with the seed or seedling roots, it will affect the emergence of seedlings and even the burning of seedlings and rotten roots. When planting, the seeds should be 5~10 cm away from the point application and compound fertilizer.
Compound fertilizer ratio raw materials different attention to the use of nutrients
The raw materials used in different brands and different concentrations of compound fertilizers are different, and the production should be selected according to the soil type and crop type.
Nitrate-containing compound fertilizer should not be used in leafy vegetables and paddy fields; compound fertilizer containing ammonium ion should not be applied on saline-alkali soil; compound fertilizer containing potassium chloride or chloride ion should not be used on chlorine-free crops or saline-alkali soil; Compound fertilizer containing potassium sulfate is not suitable for application in paddy fields and acidic soils. Otherwise, it will reduce fertilizer efficiency and even poison crops. The compound fertilizer contains two or more kinds of large elements, and the nitrogen table is easy to be volatilized or lost with rainwater. Phosphorus and potassium are easily fixed by the soil, especially the phosphorus is less mobile in the soil, and the surface is not easily absorbed by the roots of the crop. It is also not conducive to the deep rooting of the roots. In the case of drought, the fertilizer cannot be dissolved and the fertilizer effect is worse. Therefore, the compound fertilizer should be applied deep.
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