Compound fertilizers have many advantages. For example, there are many types of nutrients, which can simultaneously supply a variety of nutrients needed for crops, give full play to the mutual promotion of nutrient elements, and have high effective nutrients and obvious economic benefits. In high-concentration compound fertilizers, active ingredients The content is at least 30%, the majority is more than 40%, and some are as high as 60%. Currently, the effective nutrient content of the domestic unit fertilizer is about 20%, the weight and volume is more than twice that of the high-concentration compound fertilizer of the same nutrient, and the compound fertilizer is used. The fertilizer can save the packaging, transportation, distribution and application costs of the fertilizer and reduce the production cost. The compound fertilizer has small side effects, little adverse effects on the soil, low hygroscopicity, is not easy to agglomerate, and is convenient to store and use, and therefore is very popular.
How to reasonably choose to use compound fertilizer?
Consider soil quality
For soils with slightly alkaline, low organic matter content, and lack of available nitrogen and phosphorus, acid-nitrogen-phosphorus compound fertilizers, such as monoammonium phosphate or humic acid NPK fertilizer, and N-P compound fertilizer, should be used. However, for a few red clays or acid brown loams, chemical alkaline fertilizers such as diammonium phosphate should be used.
Consider crop varieties
Normal field crops use nitrogen and phosphorus compound fertilizer, wheat or high yield fields should use NPK compound fertilizer; wheat, rice, millet and other close planting crops, suitable for application of powdered compound fertilizer; sparsely planted crops such as corn should be used For granular compound fertilizer, legume crops should use phosphorus and potassium compound fertilizer, and some cash crops should use ternary compound fertilizers that are compatible with local soil and crops; root crops (lotus, odoratum), corn, and late rice should be selected. Compound fertilizers with high potassium content.
Relatively speaking, early rice, peanuts, sesame, rape, pepper and other crops should use compound fertilizer with higher phosphorus content; leafy vegetables should use compound fertilizer with higher nitrogen content; watermelon, strawberry, citrus, flue-cured tobacco, and tea For crops such as grapes and other chlorine-repellent crops, compound fertilizers containing no chlorine or low chlorine content should be used.
Mixed with single fertilizer
The nutrients of the compound fertilizer are fixed, and it is necessary to better exert its effect of increasing production. It is also necessary to apply single element fertilizers in order to adjust the needs of different crops for different nutrients in different growth stages. Such as rice, corn, wheat and other crops, the need for more nitrogen in the growth phase, if the choice of nitrogen and phosphorus and more diammonium phosphate, you must first calculate the amount of phosphorus, insufficient nitrogen supplement with simple nitrogen fertilizer. If the calculated amount of nitrogen in crops is used first, then the amount of phosphorus will be too much, causing waste of fertilizer.
Consider the application method
For basal fertilizer, granular compound fertilizer must be used, and the higher the hardness of the particles, the better, in order to facilitate the extension of fertilizer efficiency; The compound fertilizer containing ammonium nitrogen, easily absorbed by the soil, not easily lost, suitable for a variety of soil and crops However, it is better to implement deep facilities to improve the utilization rate; for nitrate-nitrogen compound fertilizers, it is not absorbed by the soil and is easy to leach with water, so it should not be applied to paddy fields, but suitable for dryland crops.
For phosphorus and nitrogen less nitrogen and phosphorus compound fertilizer, can be used as a deep-fertilizer base, with nitrogen fertilizer as topdressing to supplement nitrogen deficiency. For higher-priced compound fertilizers such as potassium dihydrogen phosphate, the base fertilizer is generally not used, and it is best used as a soaking seed or top dressing. When using nitrogen, phosphorus, and potassium ternary compound fertilizer as a seed fertilizer, it is necessary to consider that the nitrogen content should not be too high, otherwise it will easily cause burning and burning of seedlings.
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