After the spring, another fertilizing season was reached. Farmers' friends should pay attention to the following points when selecting and using compound fertilizers:
The compound fertilizer has a long effect and is easy to make as a base fertilizer. The compound fertilizer after processing and granulation is slower than the powder fertilizer to decompose and is not easy to lose and volatilize. The fertilizer effect lasts for a long time and is easy to use as a base fertilizer. The general mu dosage is 30-40 kg. Compound fertilizers should not be used for seedling fertilizers and late-stage fertilizers to avoid greediness.
The decomposition of compound fertilizer is slower, and attention should be paid to use with simple nitrogen fertilizer. The amount of nitrogen fertilizer is less at the seedling stage of the crop. Therefore, for the crop that uses compound fertilizer as the base fertilizer at the time of sowing, the available nitrogen fertilizer should be added in time for topdressing according to the fertilizer requirement law of different crops to meet the nutritional needs of the crop. There is a large difference in compound fertilizer concentration. Care should be taken to select the appropriate concentration. At present, most compound fertilizers are configured according to the average soil nutrient status of a certain region and the proportion of large crops requiring fertilizer. There are high, medium and low concentrations of compound fertilizers on the market. Generally, the total nutrients at low concentrations are between 25% and 30%, the medium concentrations are between 30% and 40%, and the high concentrations are above 40%. It is necessary to use economical and efficient compound fertilizers because of different regions, soils, and crops. Generally high-concentration compound fertilizers are used in economic crops, with high quality, low residue, and high utilization rate.
The compound fertilizer has a high concentration to avoid direct contact with seeds or fertilizers or to use mixed fertilizers. Compound fertilizer has high nutrient content. If it is in direct contact with the roots of seed or seedlings, it will affect sprouting and even burning seedlings and rot. When sowing seeds, the seeds should be applied with a hole, apply compound fertilizer about 5-10 cm away, avoid direct and seed with the same hole, resulting in fertilizer damage.
Compound fertilizers with different raw materials, should pay attention to the use of nutrients. The scope is different. Brands of different concentrations of compound fertilizers use different raw materials, and production should be selected according to the type of soil and the type of crop. Nitrate-containing compound fertilizers should not be used in leafy and paddy fields; compound fertilizers containing ammonium ions should not be applied on saline-alkali soils; compound fertilizers containing potassium chloride or chloride ions should not be used on chlorine-tolerant crops or saline-alkali soils; Compound fertilizers containing potassium sulfate should not be used in paddy fields and acidic soils. Otherwise, it will reduce fertilizer efficiency and even poison crops.
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