What kind of 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 quickly. 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 controlled-release compound fertilizer of about 40kg per mu is generally used as the base fertilizer. For corn without applying the base fertilizer, urea is applied at the 3-5 leaf stage, with 20kg of urea and 20kg of nitrogen-phosphorus-kiln compound fertilizer per mu. Then, at the silking stage of the corn, 20kg of urea is applied per mu, which is done about 4-5 days before the female ear of the corn opens and pollinates, to be more conducive to a large number of ears and full 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.