Temperature is an extremely important condition that affects the effect of fertilizer application. On the one hand, it can affect the conversion of fertilizers in the soil and the accumulation of effective nutrients; on the other hand, it also affects the internal physiological function of crops. In high temperature seasons, improper fertilization can not only promote Crop production has increased, and it may be reduced.
1. According to the plant's physiological growth and development process, combined with the critical area of ​​crops' fertilizer demand and the period of effectiveness, timely and effective topdressing. Fertilize when there is growth, and apply little or no if the amount of growth is small. If the growth is large, apply more (but not excessively). The stage where fertilizer is most needed is the period of vigorous growth, flowering and fruiting of crops.
2. The combined use of nitrogen, phosphorus and potassium plays a mutually promoting role: on the one hand, phosphate fertilizer can be more effectively used at higher temperatures, producing good fertilizer efficiency, on the other hand, sufficient phosphorus can increase the utilization rate of nitrogen, play a role The role of phosphorus in nitrogen. Because carbon ammonia is easily decomposed by heat and high concentration of nitrogen fertilizer is easy to cause crops to burn seedlings, the application of nitrogen fertilizer should be reduced in high temperature weather.
3. Adopt the best fertilization method: deep application, dilution and water application. Greenhouse planting** for integrated spraying of water and fertilizer, or drip irrigation. No matter what method is adopted, keep a distance of more than 10 cm from the plant, so as to avoid direct chemical fertilizer contact with plant straw burning seedlings, especially peppers, flue-cured tobacco, melons, vegetable crops.
4. High temperature weather above 35℃ is generally not recommended for top dressing. The best fertilizing time is in the evening, which is suitable for personnel operation and can make up for the shortcomings of short crop absorption time. It is the best fertilizing time.
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