During the growth and development of corn, nitrogen is the most, potassium is the second, and phosphorus is the least. Generally, for every 100 kilograms produced, it takes 3.43 kilograms of nitrogen (N), 1.23 kilograms of phosphorus (P2O5), and 3.26 kilograms of potassium (K2O). The ratio of nitrogen, phosphorus, and potassium is 3: 1: 2.8. Combining with the law of maize fertilizer requirement, corn fertilization should grasp the principle of "basic fertilizer as the main, top dressing as the supplement".

1. Base fertilizer

Time: The base fertilizer can be applied at a time when the cultivated land is raised, concentrated between 10-15cm of the cultivated layer.

Fertilizer selection: (such as corn special 28-6-8, corn new power 26-10-15, etc.) 40-60kg / mu.

Function: Provide nutrition for the whole growth period of corn, and lay a good foundation for high and stable yield.

2. Miaofei

Time: After setting seedlings.

Fertilizer selection: high nitrogen compound fertilizer (28-6-6, 28-0-0) 10-15kg / mu, fertilizer and seedlings should be kept at 10-15cm.

Function: Promote roots, promote leaves, strengthen seedlings, strengthen stems, and lay a solid foundation for multi-ear spikes.

4. Spike fertilizer

Time: from jointing to tasseling.

Fertilizer selection: High nitrogen compound fertilizer (28-6-6, 32-4-4) 15-25kg / mu, combined with spraying potassium dihydrogen phosphate is better.

Role: This is the key fertilizer that determines the size of the ears and the number of grains. The large amount of fertilizer and water in the big trumpet stage can promote the large number of summer corn.

5. Grain fertilizer (top root fertilizer)

Time: Booting period and early filling

Fertilizer selection: a large number of elemental water-soluble fertilizers, potassium dihydrogen phosphate, and special function packages.

Function: The application of grain fertilizer can prolong the time of photosynthesis of functional leaves, prevent premature aging of roots, leaves and leaves, promote filling, and increase grain weight.

Special fertilizer for corn

NPK 30-5-5, 28-6-6, 25-10-5, 25-10-16, 27-14-9 (high tower process); 28-6-8 (rotating drum humic acid process) Crop suitable for high nitrogen, low phosphorus and low potassium formula