1. Fertilizer suitable for seed fertilizer
Summer corn is a high nitrogen, high potassium and medium phosphorus crop, and the nitrogen content in the compound fertilizer should be more than 26%. Seed fertilizer should be selected with nitrogen, phosphorus, potassium three elements of compound fertilizer, the best is slow and controlled-release fertilizer, how much nutrients are needed for corn growth, and how much nutrients are released, and it can also reduce seed burning and seedling burning.
2. These kinds are not suitable for seed fertilizer
volatile and corrosive, easy to smoke seeds and seedlings, such as ammonium bicarbonate;
Contains free sulfuric acid and phosphoric acid, which can cause harm to seed germination and seedling growth, such as superphosphate;
Urea can produce a small amount of biuret, and if the content exceeds 2%, it will be toxic to seeds and seedlings;
Potassium chloride contains chloride ions, ammonium nitrate, and nitrate ions contained in potassium nitrate, which have toxic effects on seed germination;
Unrotted farmhouse manure releases a lot of heat energy during the fermentation process, which is easy to burn the roots and release ammonia to burn the seedlings.
3. Seed and fertilizer spacing
Planting and fertilizing should not be "too intimate". The concentrated application of chemical fertilizer to the roots will cause the salt concentration of soil solution in the root zone to be too large, hinder the penetration of soil moisture into the roots, and cause damage to crops due to lack of water. Chemical fertilizers applied directly to the roots, especially nitrogen fertilizers, even if the concentration does not reach the level of "burning" crops, will cause excessive absorption of nutrients by the root system, and the stems and leaves will grow vigorously, which will easily lead to diseases, lodging, etc., resulting in reduced crop yields. The vertical spacing of seeds and fertilizers in the soil is not less than 10 cm, 5 cm up and down, the sowing depth is 4-5 cm, and the deepest is not more than 6 cm. More than 6 cm will cause no seedlings or weak seedlings.
4. The amount of fertilizer should be appropriate
If the corn can not be watered in time after sowing, the sowing amount of seed fertilizer generally does not exceed 25 kg/mu, if it can be watered in time, and ensure that the fertilizer interval is more than 7 cm, the sowing amount can reach 30-40 kg/mu.
5. Cover your head with water
Pay attention to soil moisture, when the weather is dry, water the head 1-3 days after sowing to reduce seed burning and seedling burning. At the same time, it is ensured that the sowing date is advanced as far as possible to meet the requirements of corn for growth period and accumulated temperature.
6. Increase nitrogen fertilizer
If the previous crop is wheat and it is a straw returning plot, generally 200-300 kg of dry straw per mu is returned to the field, and an additional 5 kg of urea or 12.5 kg of ammonium carbonate should be applied, and the soil moisture should be kept about 20%. It is conducive to straw rot and seedling growth, and when preventing straw rot, microorganisms and seedlings compete for water and fertilizer, and can also reduce corn seedling yellow.
Summer corn "seed fertilizer and sowing" need to pay attention to a few points introduced here, I hope it will be helpful to everyone. If you want to buy high-quality and high-yield summer corn seeds, you can download the seed bank App, and the country's excellent summer corn varieties are available for everyone to choose.
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