With the further increase in fertilizer prices, many farmers' friends are considering how to increase investment but not to ensure that the crops eat well, so they began to pay attention to the use of slow-release fertilizers and controlled-release fertilizers. Recently, at the Sunjiaji Life Bank Store in Shouguang City, the person in charge, Xiao Wang, told the reporter: “We have planted some cucumbers for a year and we have tried to use controlled-release or slow-release fertilizers. The vegetable farmers do not understand the difference between slow-release fertilizers and controlled-release fertilizers. They do not know whether it is better to choose slow-release fertilizers or whether to buy controlled-release fertilizers. Buying them is blind.
Slow-release fertilizers and controlled-release fertilizers have slow nutrient release and long-term fertilizer effects. In this sense, there is no strict distinction between slow-release fertilizers and controlled-release fertilizers. However, from the point of view of the mechanism and effect of controlling nutrient release rate, there are differences between slow-release fertilizers and controlled-release fertilizers. Slow-release fertilizers slow the release of nutrients in fertilizers through chemical and biological factors, and are influenced by many external factors such as soil pH, microbial activity, soil moisture content, soil type, and irrigation water volume when released; Fertilizer is used to encapsulate water-soluble fertilizers in the membrane to slowly release nutrients through external coating. When the coated fertilizer particles come into contact with moist soil, moisture in the soil penetrates through the coating and penetrates into the interior, so that some of the fertilizer is dissolved. Some of the water-soluble nutrients slowly spread out through the micropores on the membrane. The higher the soil temperature, the faster the rate of dissolution of the fertilizer and the speed of the membrane, and the thinner the membrane, the faster the infiltration.
Second, from the perspective of the types of nutrients, the two are also different. Most slow-release fertilizers are monomeric fertilizers. The main varieties are slow-acting nitrogen fertilizers, also known as long-acting nitrogen fertilizers. Their solubility in water is very small. After being applied to the soil, under the action of chemical and biological factors, the fertilizer gradually decomposes and the nitrogen is slowly released, which satisfies the demand of nitrogen for the whole growth period of the crop. Controlled-release fertilizers are mostly N-P-K compound fertilizers or total nutrient fertilizers supplemented with trace elements. When applied to soil, the release rate is only affected by the soil temperature. However, the soil temperature has a great influence on the plant growth rate. Within a certain temperature range, the soil temperature increases, the release rate of controlled-release fertilizer is accelerated, and the growth rate of plants is accelerated, and the demand for fertilizers also increases.
The third is whether the release rate of nutrients is consistent with the demand for nutrients at all stages of the plant. Slow release fertilizer releases nutrient inhomogeneity. The nutrient release rate and the nutrient requirement of the crop may not be completely synchronized. The rate of release of nutrients from the controlled release fertilizer is in line with the speed of the nutrient requirement of the plant, so that the crop can meet nutrient requirements in different growth stages. demand.
Slow-release fertilizers and controlled-release fertilizers have slow nutrient release and long-term fertilizer effects. In this sense, there is no strict distinction between slow-release fertilizers and controlled-release fertilizers. However, from the point of view of the mechanism and effect of controlling nutrient release rate, there are differences between slow-release fertilizers and controlled-release fertilizers. Slow-release fertilizers slow the release of nutrients in fertilizers through chemical and biological factors, and are influenced by many external factors such as soil pH, microbial activity, soil moisture content, soil type, and irrigation water volume when released; Fertilizer is used to encapsulate water-soluble fertilizers in the membrane to slowly release nutrients through external coating. When the coated fertilizer particles come into contact with moist soil, moisture in the soil penetrates through the coating and penetrates into the interior, so that some of the fertilizer is dissolved. Some of the water-soluble nutrients slowly spread out through the micropores on the membrane. The higher the soil temperature, the faster the rate of dissolution of the fertilizer and the speed of the membrane, and the thinner the membrane, the faster the infiltration.
Second, from the perspective of the types of nutrients, the two are also different. Most slow-release fertilizers are monomeric fertilizers. The main varieties are slow-acting nitrogen fertilizers, also known as long-acting nitrogen fertilizers. Their solubility in water is very small. After being applied to the soil, under the action of chemical and biological factors, the fertilizer gradually decomposes and the nitrogen is slowly released, which satisfies the demand of nitrogen for the whole growth period of the crop. Controlled-release fertilizers are mostly N-P-K compound fertilizers or total nutrient fertilizers supplemented with trace elements. When applied to soil, the release rate is only affected by the soil temperature. However, the soil temperature has a great influence on the plant growth rate. Within a certain temperature range, the soil temperature increases, the release rate of controlled-release fertilizer is accelerated, and the growth rate of plants is accelerated, and the demand for fertilizers also increases.
The third is whether the release rate of nutrients is consistent with the demand for nutrients at all stages of the plant. Slow release fertilizer releases nutrient inhomogeneity. The nutrient release rate and the nutrient requirement of the crop may not be completely synchronized. The rate of release of nutrients from the controlled release fertilizer is in line with the speed of the nutrient requirement of the plant, so that the crop can meet nutrient requirements in different growth stages. demand.
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