Slow release fertilizers slow down the release rate of nutrients in fertilizers by chemical and biological factors, and are affected by many external factors such as soil pH, microbial activity, soil moisture content, soil type and irrigation water volume during release; Fertilizer is a method of coating the water-soluble fertilizer in the membrane to release the nutrients slowly. When the fertilizer particles of the coating are in contact with the moist soil, the moisture in the soil penetrates into the interior through the envelope, so that some of the fertilizer is dissolved. Part of the water-soluble nutrient is slowly and continuously diffused through the micropores on the envelope. The higher the soil temperature, the faster the dissolution rate of the fertilizer and the speed across the membrane. The thinner the membrane, the faster the penetration.
From the perspective of the types of nutrients, the two are also different. Most of the slow release fertilizers are single fertilizers. The main varieties are slow-acting nitrogen fertilizers, also known as long-acting nitrogen fertilizers. The solubility in water is very small. After being applied to the soil, under the influence of chemical and biological factors, the fertilizer gradually decomposes and the nitrogen is slowly released to meet the nitrogen demand of the crop throughout the growing season. The controlled release fertilizer is mostly N-P-K compound fertilizer or a total nutrient fertilizer supplemented with trace elements. After being applied to the soil, its release rate is only affected by soil temperature. However, the effect of soil temperature on plant growth rate is also great. Within a certain temperature range, the soil temperature increases, the release rate of controlled release fertilizer accelerates, and the growth rate of plants increases, and the demand for fertilizer also increases.
There is also the release rate of nutrients consistent with the demand for nutrients at all stages of the plant. Slow release fertilizer release nutrient unevenness, nutrient release rate and crop nutrient demand are not necessarily completely synchronized; the rate of release of nutrients by controlled release fertilizer is in line with the plant's demand for nutrients, so as to meet the nutrient requirements of crops at different growth stages. demand.
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