Principle of mixed application of fertilizer

Matters needing attention in mixed application the so-called mixed application of fertilizer is to apply two or more kinds of fertilizers with different properties and functions, such as nitrogen, phosphorus and potassium fertilizer, or quick-acting fertilizer and late-acting fertilizer, or organic fertilizer and inorganic fertilizer, micro-fertilizer and growth hormone according to soil conditions, crop growth needs and nutrient supply. The main principles of mixed use of fertilizers include the mixed application between micro-fertilizers and between micro-fertilizers and common chemical fertilizers, which must follow the following principles: (1) the mixed application should be highly targeted and must be suitable for the needs of crop nutrition and soil fertility; (2) after mixing, the complementary effect can be achieved and the physical state of fertilizer can be improved. (3) it should be beneficial to increase the efficiency of each other, and the fertilizer efficiency of any of them should not be reduced, so as to realize the expectation of "one application and multiple effects". (1) Zinc fertilizer should not be mixed with alkaline fertilizers such as ammonia, and it is best not to be mixed with calcium superphosphate soluble phosphate fertilizer, so as not to form zinc phosphate precipitation and reduce fertilizer efficiency. (2) the concentration and dosage of trace element fertilizers should not exceed the specified amount, otherwise the seeds will not emerge after seed soaking and dressing, while foliar spraying will cause seedling burning and other damage. Trace element fertilizers had better not be mixed with plant ash; (4) when all kinds of micro-fertilizers are mixed with soil and miscellaneous fertilizers, they should be diluted gradually, fully and evenly, preferably with a small amount of fine soil and then fully mixed with soil and miscellaneous fertilizers; (5) when micro-fertilizers are sprayed with water or mixed with dung water, they should be dissolved with a small amount of water first, and then mixed into clear water and fecal water to avoid burning seeds and seedlings.