High temperature and dry weather, top dressing needs to be cautious
Temperature is an extremely important condition affecting the effect of fertilizer application. It can affect the conversion of fertilizer in soil and the accumulation of effective nutrients. On the other hand, it also affects the internal physiological effects of crops. In high temperature and dry season, fertilization can not only promote Crops increase production and may reduce production.
1. According to the physiological growth and development process of plants, combined with crop critical area and maximum potency, timely and effective topdressing. If there is growth, it will be fertilized, and if the amount of growth is small, it will be applied less or not. If the amount of growth is large, it will be applied (but not excessive). The stage where fertilizer is most needed is the vigorous growth period, flowering period and fruiting period of crops.
2. The combination of nitrogen, phosphorus and potassium plays a mutually reinforcing role: on the one hand, phosphate fertilizer can be used more efficiently at higher temperatures, producing good fertilizer efficiency. On the other hand, sufficient phosphorus can increase nitrogen utilization rate. The role of phosphorus in raising nitrogen. Because carbon ammonia is easily decomposed by heat and high concentration of nitrogen fertilizer is easy to cause crop burning, high temperature and dry weather should reduce the application rate of nitrogen fertilizer.
3. Adopt the best fertilization method: deep application, dilution and pouring with water. It is best to plant water and fertilizer in the greenhouse, or drip irrigation. No matter what method is adopted, the plant should be kept at a distance of more than 10 cm to avoid direct contact of the fertilizer with plant straw burning, especially pepper, flue-cured tobacco, melon and vegetable crops.
4. At noon, high temperature weather above 35 °C generally does not promote topdressing. The best fertilization time is in the evening, which is suitable for personnel operation and can make up for the shortcomings of short absorption time of crops. It is the best fertilization time.
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