Corn dressing should be based on the principle of light weight, medium weight and full complement. When corn grows to about 15 leaves, 10 kg of urea or 10 to 15 kg of ammonium nitrate can be applied with watering. From corn heading to grain filling stage, 0.25 kg of potassium dihydrogen phosphate and 0.5 kg of urea were used for 40 to 50 kg of water per acre and sprayed on the leaves in the afternoon for extra-root fertilization to significantly reduce bald head.
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