What are the correct methods for topdressing corn?
How do you correctly topdress corn? Please refer to the following corn topdressing techniques for your reference: First application at 3 or 4 leaves. This refers to one application combined with thinning, final thinning and transplanting; it is the foundation for ensuring complete and even seedlings and promoting strong seedlings. Generally, the method of topdressing according to seedling condition is adopted, and human excrement and urine or biogas fertilizer is suitable, about 30 loads per mu...
How do you correctly topdress corn? Please advise
Please refer to the following corn topdressing techniques for your reference:
First application at 3 or 4 leaves. This refers to one application combined with thinning, final thinning and transplanting; it is the foundation for ensuring complete and even seedlings and promoting strong seedlings. Generally, the method of topdressing according to seedling condition is adopted, and human excrement and urine or biogas fertilizer is suitable, about 30 loads per mu. For fertile fields with sufficient base fertilizer, apply less; for transplanted fields, apply appropriately more, and combine this with intertillage and weeding to ensure the fertilization work is done well.
Second application at the knee-high stage. This is the jointing fertilizer, and also a topdressing at the time when corn stems and leaves are growing vigorously and the female and male inflorescences begin to differentiate. Proper topdressing can help accumulate more photosynthesis and benefit the differentiation of female and male inflorescences. This topdressing accounts for 30% of the total topdressing, with the fertilizer type mainly corn-specific compound fertilizer, 25-30 kg per mu. At the same time, combine topdressing with earthing up and ridging.
Third application at the funnel stage. This period coincides with the differentiation stage of the spikelets and florets of the female and male inflorescences of corn. It is the key period that determines ear size and the number of grains per ear, and also a vigorous period when vegetative growth and reproductive growth advance together. Heavy application of ear fertilizer can achieve strong stalks and large ears, with a significant yield increase effect. This topdressing accounts for 60% of the total topdressing amount. Except for high-yield fields, generally no more phosphorus and potassium fertilizer is applied, and about 20 kg of urea is applied per mu.
Fourth application to increase grain weight. Increasing grain weight is a topdressing around the flowering and pollination period of corn, to prevent fertilizer deficiency in the later stage, prolong the life of green leaves, improve their photosynthetic efficiency, and ensure plump grains with sufficient photosynthetic products. Grain fertilizer should be applied early, generally when the ear silks, so that the fertilizer effect is exerted during the grain-filling and milk-ripe stages. For skillful application, it depends on the ear fertilizer and plant appearance; when ear fertilizer is insufficient, there are many yellow leaves below the ear node of the plant, and fertilizer deficiency occurs, grain fertilizer should be supplemented.
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