Temperature is an important external condition for the application of fertilizers, especially in times of high temperature and drought. Fertilization may reduce crop yields. You must be especially cautious when applying fertilizers during high temperature and drought.
Fertilizer varieties use more phosphorus and less nitrogen
On the one hand, phosphate fertilizer can be used more effectively at higher temperatures and produce good fertilizer efficiency; on the other hand, it can increase the utilization rate of water in the soil, play a role in alleviating drought and promoting each other. In addition, sufficient phosphate fertilizer can increase the utilization rate of nitrogen and play a role in fertilizing nitrogen with phosphorus. Reduce the amount of nitrogen fertilizers, especially carbon ammonia that is easily decomposed by heat, because carbon ammonia that is easily decomposed by heat and high-concentration nitrogen fertilizer can easily cause crop burning.
The amount of fertilizer applied cannot be equal to the amount applied in normal weather
In the hot and dry season, soil moisture evaporates strongly, and the concentration of surface water solution increases sharply. At this time, if the same amount of fertilizer is applied as in normal weather, crop yield will not only be maintained or increased, but it may also decrease. For example, when the rainfall is moderate, applying 12 kilograms of pure nitrogen per mu of corn may yield high yields. If the same amount of fertilizer is applied during high temperature and drought, the yield will be reduced.
Fertilization time is best in the morning and afternoon
Applying fertilizer in the morning, although the personnel feel more comfortable to operate, as the sun rises, the temperature rises sharply, the water is quickly evaporated, the crop absorption time is short, and the fertilizer utilization rate is low. Fertilization at noon, due to the high temperature, is not conducive to fertilizer Absorption and personnel operation; evening fertilization is not only suitable for personnel operation, but also can make up for the shortcomings of crop absorption time (because the evening is a process of lowering temperature, surface water evaporation is weakened, and water retention time is long), which is the best fertilization time.
Fertilization method: Deeply apply or dissolve and dilute, then mix with water and apply
When fertilizing, keep a distance of more than 10 cm from the plant to prevent the chemical fertilizer from directly contacting the roots of the plant and causing the seedlings to burn. Generally, top dressing is not used in hot weather above 35℃ at noon. The best time for fertilization is in the evening, which is not only suitable for personnel operation, but also beneficial to crop absorption.
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