How to Mix the Proportions of the "Old Three" Fertilizers for Corn

The proportions of the "old three" fertilizers for corn are determined by the corn variety. Generally, the nitrogen-phosphorus-potassium fertilizer ratio for spring corn is 1:0.3:1.5, and the nitrogen-phosphorus-potassium fertilizer ratio for summer corn is 1:0.5:1.5. In addition, according to the growth condition of the plants, some quick-acting fertilizer or decomposed farmyard manure should be applied.

How should corn be fertilized at each stage?

1. Base fertilizer: The base fertilizer is mainly applied as a combination of slow-release fertilizer and quick-acting fertilizer. Slow-release fertilizer refers to farmyard manure, and quick-acting fertilizer refers to ordinary superphosphate, urea, potassium fertilizer and zinc fertilizer. 1000-1500 kg of organic fertilizer, 30 kg of ordinary superphosphate, 6 kg of urea and 2 kg of zinc fertilizer are applied as the base fertilizer all at once.

2. Seedling fertilizer: When the plants have 6-7 leaves, apply 10 kg of urea in a ring around the corn plants. When applying, the urea should be 3-4 cm away from the plants and must not be applied directly on the plants. The best time to fertilize is after rainy days. If the weather is too dry, it is best to water a little after topdressing.

3. Jointing fertilizer: Jointing fertilizer is generally applied two months after sowing, when the number of corn leaves is generally 11-12. Apply 24 kg of urea and 10 kg of potassium fertilizer all at once. The application method is the same as for seedling fertilizer, applying in a ring, and if necessary, add some fertilizer water.

The above is the relevant introduction to the proportions of the "old three" fertilizers for corn. We hope it is helpful to everyone.