In recent years, due to the lack of organic fertilizer input and people’s demand for increased yields, the amount of fertilized corn has increased significantly, and the area of ​​application of some high-concentration compound fertilizers has also been expanding, which has effectively promoted the increase in yield, but it is also common. There is fertilizer, deficiency of disease at the seedling stage, or reduction of yield during the later period. Farmers need to understand the essentials of rational fertilization of spring corn. Spring corn fertilization should make the following four determinations:
First, determine the appropriate ratio
To determine a reasonable proportion of nitrogen, phosphorus, potassium fertilizer, and strive to balance the fertilization. Absorption of nitrogen, phosphorus, potassium ratio is roughly 100:37:84, combined with higher nitrogen, potassium utilization, phosphorus utilization is low, in the fertilization should focus on nitrogen, appropriate amount of phosphorus, potassium, suitable The proportion of nitrogen, phosphorus and potassium applied is roughly 100:60:40, and the formula fertilization will be implemented.
Second, determine the amount of high-yield fertilizer
To determine a reasonable amount of fertilization, fertilizer should be produced and fertilizer should be set by soil fertility. One kilogram of nitrogen, phosphorus, and potassium purified nutrients can increase grain yield by 8 to 10 kilograms. Generally, for every 100 kilograms of grain produced, the soil's production capacity is calculated at 60%, requiring 3.43 kilograms of pure nitrogen, 1.23 kilograms of phosphorus, and 2.36 kilograms of potassium.
Third, determine the number of scientific fertilization
Strive to make all the fertilizers effective and reasonable, to do in the end fertilizer, seed fertilizer, top dressing with the application. The base fertilizer can be applied on the basis of applying organic fertilizer of 1000-1500 kilograms. The fertilizer can be selected from 15 nitrogen to 15 phosphorus to 15 potassium (general type), 20 nitrogen to 15 phosphorus to 5 potassium (middle or more fertile) or 16 nitrogen to 12 Phosphorus ~ 12 potassium (low or barren) 20 ~ 25 kg, big bell mouth topdressing urea 20 ~ 25 kg, head urea 10 ~ 15 kg.
Fourth, determine the efficient fertilization method
Rational fertilization method should be adopted. The application of base fertilizer should be combined with organic fertilizer and chemical fertilizer. The fertilization method can be applied before the arable land can also be combined with the machine to turn deep; the seed fertilizer should be strictly separated from the seed or strictly limited to the type of phosphoric acid Diammonium, the amount of mu is less than 5 kilograms, can be mixed with the corn seed to the ground; top dressing should be in the jointing - booting stage, that is, the small bell mouth - big bell mouth period, from the stem base 10 to 15 cm, mechanical side depth Apply to 10 to 15 centimeters, or people, storage capacity to open the ditch, Shi points and timely cover soil.
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