What is the relationship between weather conditions and fertilization? How to forecast fertilization according to weather conditions?

Crop growth and fertilization effect are closely related to weather conditions. Light affects the photosynthesis of crops, and sugar, the product of photosynthetic crops, is the energy for root respiration, and lack of energy will affect the absorption of nutrients by roots.

Therefore, under the condition of insufficient light, the absorption of nitrogen, phosphorus, potassium, calcium, magnesium, zinc, manganese and other elements decreased obviously. Temperature not only affects the transformation of fertilizer in soil, but also affects the absorption of nutrients by crop roots, such as rice irrigation with low temperature, which is prone to rice blast, because low temperature affects the absorption of silicon and potassium by rice. On the one hand, water can accelerate the dissolution of fertilizers and promote the absorption of nutrients by crops; on the other hand, if there is too much water, it will not only cause poor soil ventilation, which is not conducive to the absorption of nutrients by crops, but also cause nutrient loss, so it is not suitable to apply fertilizer on rainy days. Fertilization in sunny days should also be determined according to the dry and wet soil. If the soil is wet, the fertilizer can be used thicker; if the soil is dry, the fertilizer should be diluted and applied.

In the long-term production practice, people have summed up the fertilization forecast for the possible nutrient deficiency caused by crops according to the weather conditions. For example, in low temperature years in early spring, rice is prone to phosphorus deficiency and zinc deficiency, so attention should be paid to the use of phosphate fertilizer or zinc fertilizer; under the condition of lack of light, potassium fertilizer should be increased to improve the utilization of light energy in crops; in dry years, rape is prone to boron deficiency. Vegetables (Chinese cabbage, radish, etc.) are prone to calcium deficiency, and attention should be paid to the use of boron fertilizer and calcium fertilizer. In the rainy season, it is easy to cause the leaching of available iron in the soil, and iron deficiency often occurs in fruit trees.