1 , the standard of corn bottom fertilization
According to the fertilizer requirement and fertilizer requirement of corn growth , compound fertilizer with high nitrogen, low phosphorus and high potassium should be used. Generally, the nitrogen content is about 20 %, the phosphorus content is about 10 %, and the potassium content is about 15 % . It is not suitable to use nitrogen. A compound fertilizer with balanced phosphorus and potassium is used as a base fertilizer. Also, according to the rule of the fertilizer and fertilizer requirement required characteristics of corn, choice potassium fertilizer can be increased and the resistance of maize corn promote weight gain post, in order to achieve the purpose of yield increase.
2 , should be combined with heavy fertilizer and corn long-term topdressing
Applying the base fertilizer once, because the corn growth period is longer, it will cause the corn to be de-fertilized in the later stage, which will affect the yield. In addition, the one-time application of the base fertilizer, the large amount, easy to burn the seedlings will affect the corn seedlings, so It should be combined with corn base fertilizer and top dressing. Generally, 20 to 25 kg of high-quality compound fertilizer is applied per acre . In the corn growing season, 20 kg of urea is applied . This kind of fertilization can not only ensure the nutrient demand of the whole growth period of corn, but also not easy to cause burning, which can increase corn yield and reduce nutrient loss.
3 , NPK balanced compound fertilizer is not suitable as a base fertilizer
The amount of nitrogen, phosphorus and potassium required for any crop will not be balanced. Therefore, the application of nitrogen, phosphorus and potassium balanced compound fertilizers will result in one of the excess nutrients, causing nutrient waste and inhibiting crops. the absorption of other nutrients, can not reach a better fertilizing effect, unnecessary increased their input.
4 bottom fertilizer is best not to apply diammonium phosphate alone
NPK fertilizer belonging maize bottom, containing nitrogen, phosphorus, potassium and trace elements three elements, belonging to the DAP compound fertilizer only nitrogen, phosphorus two elements. The growth of corn requires three elements of nitrogen, phosphorus and potassium, and the demand for potassium fertilizer is large. Therefore, when using corn base fertilizer, the ternary compound fertilizer with higher potassium content should be selected. If diammonium phosphate is applied, it is best to use it in combination with potassium.
5 interval between fertilizer and seed when corn is planted
Fertilizer and seed corn planting interval should be determined according to the amount of nitrogen fertilizer, the nitrogen content of generally 5 ~ 7 cm interval of about 20%, nitrogen content of about lO ~ 12 cm interval of 25%, not less than the lowest 5 cm .
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