Compound fertilizer has the advantages of high nutrient content, less accessory components, and good physical properties. It plays an important role in balancing fertilization, improving fertilizer utilization, and promoting high and stable yields of crops. However, it also has some shortcomings. For example, its nutrient ratio is always fixed, and the types of nutrients, quantities, and proportions required for different soils and crops are diverse. Therefore, before the use of the best soil testing, understand the texture and nutritional status of field soil, but also pay attention to the application of fertilizer and unit, in order to get better results.
The long-term effect of compound fertilizers and the extensive use of basal fertilizers indicate that both binary and ternary compound fertilizers are based on basic application. This is because the compound fertilizer contains many nutrients such as nitrogen, phosphorus, and potassium. It is particularly sensitive to phosphorus and potassium in the early stage of the crop. Phosphorus and potassium fertilizers are required to be used as a base fertilizer. Compound fertilizer should not be used for seedling fertilizer and late-stage fertilizer to prevent greediness. The decomposition of compound fertilizer is slower. For crops that use compound fertilizer as the base fertilizer at the time of sowing, according to the law of fertilizer requirements for different crops, the available nitrogen fertilizer should be promptly added during top dressing so as to meet the nutritional needs of the crop.
There is a big difference in compound fertilizer concentration. Care should be taken to select the appropriate concentration. Currently, most compound fertilizers are configured according to the average soil nutrient status of a region and the proportion of crops that need fertilizer. There are high-, medium-, and low-concentration series compound fertilizers on the market. Generally, low-level total nutrients are between 25% and 30%, medium concentrations are between 30% and 40%, and 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 and should avoid direct contact between the seed and the fertilizer. 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 5 to 10 cm apart from the hole and the compound fertilizer.
Compound fertilizers with different ratios of raw materials, it should be noted that the use of nutrients in different brands, different concentrations of compound fertilizers used in different materials, production, according to the type of soil and crop species to choose to use. Nitrate-containing compound fertilizers should not be used in leafy vegetables 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. The compound fertilizer contains two or more kinds of macroelements. The nitrogen forms easily loses volatility or is lost to the rainwater. The phosphorus and potassium are easily fixed by the soil. Particularly, the phosphorus has little mobility in the soil, and it is not easily absorbed by the crop roots. It is also not conducive to deep rooting. In the event of drought, the fertilizer cannot be dissolved and the fertilizer efficiency is worse. Therefore, the compound fertilizer should be deeply buried.
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