Compound chemical fertilizer refers to two or more chemical fertilizers containing nitrogen, phosphorus, and potassium. A dual compound fertilizer containing two kinds of nutrient elements and a ternary compound fertilizer containing three kinds of nutrient elements. The active ingredients of compound fertilizers are generally represented by the corresponding percentages of N, P2O5, and K2O. According to different production methods, chemical fertilizers can be divided into two categories: compound fertilizers and compound fertilizers. At present, the commonly used compound chemical fertilizers in China are classified into the following categories: First, binary compound fertilizers (I) Nitrogen and phosphorus compound fertilizers The nitrogen and phosphorus binary compound chemical fertilizers welcomed by the masses are relatively stable, generally gray or gray particles, do not absorb moisture and are easily soluble in water. The pH value of the aqueous solution is 7.0 to 7.2, which is a chemical neutral fertilizer. Containing from N12% to 18% of P2O56% to 52%, nitrogen and phosphorus are readily available to plants for absorption and utilization. Application method: Ammonium phosphate is a phosphorus-based nitrogen and phosphorus compound fertilizer. Particularly suitable for phosphorus-deficient soils and plants requiring more phosphorus. The granular ammonium phosphate is most suitable for application as a seed fertilizer and basal fertilizer. The amount of basal fertilizer is generally about 7.5 kilograms per acre; the amount of seed fertilizer is generally 2.5 to 3 kilograms per acre. Do not make direct contact with the seed when it is used as a seed fertilizer so as not to inhibit the germination of the seed. Generally, the amount of fertilizer applied per acre is 10 to 15 kg. The ammonium phosphate should not be mixed with alkaline fertilizers such as ash and lime so as to avoid the volatilization of ammonia and the decrease of the availability of phosphorus. (2) Nitrogen and Potassium Compound Fertilizers Nitrogen and Potassium Fertilizers: The main components are K2SO4, (NH4)2SO4, N14% and K2O from 11% to 16%. White crystal, soluble in water, low hygroscopicity. Can be used as base fertilizer, seed fertilizer and top dressing. Application method: Nitrogen-potassium compound fertilizer is particularly suitable for potassium-promoting plants. The effect of applying fertilizer on nitrogen-neutral potassium soil is more significant, and phosphorus fertilizer should be used in conjunction with phosphorus-deficient soil. Basal fertilizer generally applies about 7.5 kilograms per acre, seed fertilizer is generally applied 2.5 to 3 kilograms per acre, and top dressing generally applies 10 to 15 kilograms per acre. (C) Potassium and potassium compound fertilizers Potassium dihydrogen phosphate is a high-concentration phosphorus and potassium compound fertilizer that can be directly absorbed and utilized by crops. It is suitable for any soil and crop, especially for phosphorus- and potassium-depleted soils and phosphorus- and potassium-rich crops. . It contains 22.8% phosphorus, 28.6% potassium, white crystals, soluble in water, acidic, PH between 3 to 4 small moisture absorption. Application method: Potassium dihydrogen phosphate can be used as basal fertilizer, topdressing fertilizer and seed fertilizer, but at present, it is only used for seed soaking, seed dressing and external root fertilization. 1 Seed soaking method: Use 0.5 kg of potassium dihydrogen phosphate to dip 200 to 300 kg of water for about 15 hours, remove and dry it and sow. 2) Seed dressing method: Apply 125-300 g of monopotassium phosphate per acre, add 1.5 kg of water, mix well with the seed after thawing, then suffocate for 2 to 3 hours, and soak to dry. 3 external fertilization: suitable concentration of 0.1% to 0.3% for external root fertilization, spraying 50-75 kg per acre is appropriate, spraying period before and after flowering, foliage plants such as: cycad, Araucaria, pine needles, cedar, etc. , spraying 1 to 2 times in the growth period, each time between 5 and 7 days, with strong stalk, disease resistance and other effects. Compound Fertilizers for Nitrogen, Phosphorus and Potassium Compound fertilizers refer to chemical fertilizers containing three nutrient elements of nitrogen, phosphorus and potassium. The fertilizer is mostly compound fertilizer. Such as: N, P, K12-24-12, 10-20-15, 10-30-10 and so on. Application method: Nitrogen, phosphorus, potassium compound fertilizer is a multi-purpose, high-concentration and quick-acting fertilizer, and fruit trees, seedlings, flowers and other crops can be used, generally used as base fertilizer and top dressing. For basal fertilizer, apply 5 to 7.5 kilograms per acre, which is better for top-dressing crops such as fruit trees.
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