What is the best foliar fertilizer to spray on corn

Spraying foliar fertilizers on corn can choose urea, potassium dihydrogen phosphate, amino acid water-soluble fertilizers, trace element fertilizers, and humic acid fertilizers. Foliar fertilizer can quickly supplement nutrients, but it needs to be selected reasonably according to the growth stage of corn and soil conditions.

1. Urea

Urea is a quick acting fertilizer with high nitrogen content, suitable for spraying during the maize seedling stage to the jointing stage. Spraying at a concentration of 0.5% -1% can promote leaf growth and enhance photosynthesis. Be careful to avoid spraying during high temperature periods to prevent leaf burning. The spraying effect on nitrogen deficient plots is more significant, but it needs to be used in conjunction with base fertilizer.

2. Potassium dihydrogen phosphate

Potassium dihydrogen phosphate containing phosphorus and potassium elements should be sprayed before and after corn tasseling. Spraying at a concentration of 0.2% -0.3% can promote grain filling and improve lodging resistance. When mixed with insecticides, compatibility should be confirmed to avoid immediate spraying after rain. Spraying in phosphorus and potassium deficient soil can significantly increase yield.

3. Amino acid water-soluble fertilizer

Amino acid water-soluble fertilizer contains various active substances and can be used throughout the entire growth period. Spraying can enhance the stress resistance of corn and improve nutrient absorption efficiency. It is recommended to dilute it 500-800 times before use and avoid strong light periods. The restoration effect is better for corn that has suffered from drought or freezing damage.

4. Trace element fertilizers

Zinc, boron, and other trace element fertilizers are mostly sprayed during the corn horn stage. The commonly used concentration of zinc sulfate is 0.1% -0.2%, and the concentration of borax is 0.05% -0.1%, which can prevent problems such as bald spots and flower grains. Targeted supplementation is required based on soil testing results, as excessive amounts can easily lead to toxicity.

5. Humic acid fertilizer

Humic acid fertilizer can improve soil structure and is suitable for use in continuous cropping plots. Spraying promotes root development and enhances drought resistance. Suggest diluting 300-500 times and using it alternately with fertilizer for better results. The use of saline alkali land can lower the soil pH value.

Spraying foliar fertilizer on corn should avoid rainy days and strong sunlight at noon. If it rains within 6 hours after spraying, it should be sprayed again. Different growth stages have different nutrient requirements, with a focus on nitrogen fertilizer during the seedling stage and increased application of phosphorus and potassium fertilizers in the middle and later stages. It is recommended to scientifically mix fertilizers based on soil testing results, and adding organic silicon additives during spraying can improve adhesion rate. Pay attention to combining with root fertilization to avoid relying solely on foliar supplementation. Before spraying, it is necessary to clean the equipment to prevent pesticide residues from affecting fertilizer efficiency.