How to fertilize corn in summer?

How to fertilize corn in summer? Please guide summer corn to be fertilized as follows: adequate base fertilizer: the growth period of summer corn is relatively short. According to the conditions of fertilizer sources, more mature organic fertilizer should be applied as much as possible, combined with nitrogen, phosphorus and potassium fertilizer. Timely and appropriate amount of topdressing: corn needs more fertilizer, base fertilizer alone can not meet the needs, especially summer and autumn sowing corn, generally lack of base fertilizer, it is more important to increase the application of chemical fertilizer. Corn topdressing is generally based on available nitrogen fertilizer, the amount of topdressing per mu is equivalent to about 30 kg of urea, and the distribution of topdressing is roughly 10% at seedling stage, 20% for jointing fertilizer, 60% for ear fertilizer and 10% for grain fertilizer. The main results are as follows: 1. when the seedling fertilizer is applied after the seedling of maize is fixed, 5 kg of urea can be applied per mu. 2. Jointing fertilizer is applied before and after jointing of maize. According to the seedling condition, 5 kg urea can be applied per mu. 3. Panicle fertilizer is the most important topdressing for high yield of maize. Generally, about 10 days before heading, that is, the big trumpet mouth period, about 20 kg of urea per mu. No matter spring or summer corn, heavy application of ear fertilizer can achieve a significant yield-increasing effect. 4. Grain fertilizer refers to the fertilizer applied before and after pollination. Grain fertilizer can prolong the time of photosynthesis of leaves, prevent premature senescence of roots, stems and leaves, promote grain filling and increase grain weight, generally applying 5 kg urea per mu. It can also be sprayed with 0.5 kg urea plus 100-150 g potassium dihydrogen phosphate and 50 kg water. Attention should be paid to the application of zinc fertilizer: corn is sensitive to zinc deficiency, which is characterized by "white seedling flowers and leaves", heading and silking 2 days later than normal, more empty ears, lack of grains and bald ears. The supplementary application of zinc fertilizer generally uses 1-1.5 kg of zinc sulfate per mu, mixed with organic fertilizer as base fertilizer, corn seed dressing with about 5 grams of zinc sulfate per 0.5 kg, dissolved with a small amount of water and sprayed on the seeds, and the concentration of zinc sulfate sprayed outside the root is 1.5-2%. It is generally sprayed 2-3 times in the seedling stage. Click to get more corn planting techniques click to get more food crop planting techniques