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

Crop growth and fertilization effect are closely related to weather conditions. Light affects the photosynthesis of crops. Sugar, the product of photosynthesis, is the energy that roots breathe, and insufficient 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 and manganese is obviously reduced. Temperature not only affects the transformation of fertilizer in soil, but also affects the absorption of nutrients by crop roots. For example, rice in mountainous areas is often irrigated with low-temperature water, 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 lead to poor soil ventilation, but also cause the loss of nutrients, so it is not suitable for fertilization in rainy days, and the fertilization concentration should be determined according to the dry and wet conditions of the soil in sunny days. If the soil is wet, fertilizer can be used more intensively; If the soil is dry, the fertilizer should be diluted before fertilization.

In the long-term production practice, people have summed up the fertilization methods for forecasting crop element deficiency disease according to weather conditions. For example, in early spring and low temperature years, rice is easy to lack phosphorus and zinc, so it is necessary to pay attention to the use of phosphate fertilizer or zinc fertilizer; Under the condition of insufficient light, potassium fertilizer should be applied to improve the utilization rate of light energy for crops; In dry years, rape is prone to boron deficiency, and vegetables (Chinese cabbage, radish, etc. ) are prone to calcium deficiency, so pay attention to the use of boron fertilizer and calcium fertilizer; It is easy to cause leaching loss of available iron in soil in rainy season, and iron deficiency often occurs in fruit trees.