Which fertilizer is more suitable for corn topdressing?

Corn growth requires a relatively large amount of nitrogen, phosphorus, potassium nutrients, as well as a considerable amount of zinc and boron fertilizers. Because corn is relatively sensitive to zinc and boron, it is more suitable to choose high-nitrogen compound fertilizers combined with zinc, boron and other trace elements as top dressing for corn.

Corn plants can grow up to over 2 meters tall and develop rather rapidly. They require more nitrogen than other crops. Therefore, from the seedling stage to the tasseling stage, corn consumes about 65% of the total nitrogen needed throughout its growth period. The more vigorous the growth, the more nitrogen is consumed.

When sowing corn, a high-nitrogen slow-release and controlled-release compound fertilizer of about 40 kilograms per mu is generally used as base fertilizer. For corn without base fertilizer application, urea of 20 kilograms and compound fertilizer of nitrogen, phosphorus and potassium of 20 kilograms per mu should be applied at the 3 to 5 leaf stage. Then, at the tasseling stage of corn, 20 kilograms of urea per mu should be applied by furrow application about 4 to 5 days before the silks of the female ears emerge for pollination, which is more conducive to a greater number of ears and plumper grains.

During the period when corn plants have 3 to 5 leaves and when they start to tassel (the stage of flowering), apply foliar fertilizer. Use 0.3% diammonium phosphate, 0.5% urea, 4000 times diluted brassinolide, along with 0.1% chelated zinc fertilizer and 0.1% chelated boron fertilizer. Mix them together and spray evenly. This can regulate and promote the growth of corn. It would be even better to add pesticides and fungicides when spraying the foliar fertilizer for disease and pest prevention.