Summer corn "seeds and sows with fertilizer" saves labor and does not burn seedlings. Do this
The "seed and fertilizer simultaneous sowing" of summer corn can improve the accuracy of fertilization and fertilizer utilization, save labor and time and effort, can greatly improve the farming efficiency, promote the seedlings and seedlings, and then increase the yield. In the past two years, the area of ​​simultaneous seed fertilizer has become more and more popular. However, in the production, the situation of burning seedlings and even destroying the seeds has been constantly occurring. For this reason, farmers must be reminded to pay attention.
What are the applicable fertilizers? Summer corn is high-nitrogen, high-potassium, and medium-phosphorus crops. The nitrogen content in compound fertilizers should be above 26%. Seed fertilizers should choose compound fertilizers containing nitrogen, phosphorus, and potassium.****** is a slow and controlled release fertilizer. How much nutrient release is required for corn growth, and it can also reduce burning seeds and seedlings.
The following are not suitable for seed fertilizer: (1) It is volatile and corrosive, and is easy to damage seeds and seedlings, such as ammonium bicarbonate; (2) It contains free sulfuric acid and phosphoric acid, which will cause damage to seed germination and seedling growth. Such as superphosphate; (3) Urea can generate a small amount of biuret, if the content exceeds 2%, it will be toxic to seeds and seedlings; (4) Potassium chloride contains chloride ions, ammonium nitrate, and potassium nitrate contains nitrate. Ions are toxic to seed germination; (5) Immature farmyard manure releases a lot of heat energy during the fermentation process, which is easy to burn roots and release ammonia to burn seedlings.
The amount of fertilizer should be appropriate. If the corn cannot be watered in time after sowing, the sowing rate of seed fertilizer is generally not more than 50 kg/mu. If it can be watered in time and the interval between the seeding fertilizers is more than 7 cm, the sowing rate can reach 60-80 kg/mu. mu.
Seed and fertilizer should not be "too close". Concentrated application of chemical fertilizers to the roots will cause excessive salt concentration in the soil solution in the root zone, hinder the penetration of soil moisture into the roots, and damage the crops due to lack of water. Chemical fertilizers applied directly to the roots, especially nitrogen fertilizers, will cause excessive absorption of nutrients by the roots, even if the concentration does not reach the level of "burning" the crops. Seed fertilizer spacing is 8-10 cm left and right, 5 cm up and down, sowing depth is 4-5 cm, and the deepest is no more than 6 cm. More than 6 cm will cause the phenomenon of no seedlings or weak seedlings.
Don't forget to water the "head covering water" and pay attention to the soil moisture. When the weather is dry, water the head covering 1-3 days after sowing to reduce the burning of seeds and seedlings. At the same time, ensure that the sowing date is as early as possible to meet the requirements of the growth period and accumulated temperature of corn.
Appropriate increase in nitrogen fertilizer. If the previous crop is wheat and the straw is returned to the field, generally 400-600 catties of dry straw are returned per mu, and an additional 10 catties of urea or 25 catties of ammonium bicarbonate should be added, and the soil moisture should be kept at about 20% . It is conducive to the rot of straw and the growth of seedlings, prevents the microorganisms from competing with the seedlings for water and fertilizer when the straw rots, and can also reduce the yellowing of corn seedlings.
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