Slowly controlled release fertilizer is true or false?
Controlled-release fertilizers generally control the release rate of nutrients through the use of a film of fertilizer outside the pellets to achieve the purpose of slowing the release of nutrients. Therefore, the outer coating of slow-release fertilizers tends to be colored. At present, most of the controlled-release fertilizers marketed are blended with ordinary fertilizers so that nutrients are provided by common fertilizers in the early stages of crop growth and by slow and controlled release fertilizers in the later stages of crop growth. Zhang Min suggested that after opening the package of slow-release fertilizers, 100 fertilizers can be randomly selected to count the number of colored chemical fertilizers. If the number of colored particles exceeds 15, the controlled-release fertilizer content will reach 15%. , is a qualified product. If it fails, it will fail. In view of the situation in which unscrupulous manufacturers deliberately stained ordinary fertilizers to pretend to apply fertilizer, Zhang Min suggested that the fertilizer can be put into the water to soak. Usually, the dyes will fade in water, and the qualified slow-release fertilizer coating will not fade. . “Different crops have different growth periods and fertilizer requirements. The development direction of slow- and controlled-release fertilizers is specialization. For controlled release fertilizers for crops such as corn, cotton, and rice, the release cycle is within two or three months.†Zhang Min Say. To further assess the quality of slow-release fertilizers, Zhang Min suggested that slow-release fertilizers be cooked in boiling water. If the release period is within two or three months of controlled-release fertilizer, all release within half an hour, indicating that the quality of sustained release is normal; if only a part of it is released, the quality can be explained. "If time permits, you can also soak the controlled-release fertilizer in cold water for a week or two to see if it is released. If the release cycle lasts for 2 months, the release of the slow-release fertilizer is half a month. Products.†Zhang Min said. When farmers purchase slow and controlled release fertilizers, in addition to buying products from regular stores and selecting products from large companies, they also need to ask for corresponding purchase vouchers. At present, the area of ​​summer corn planted with slow-release fertilization with seed fertilizers is becoming larger and larger. Many farmers believe that if there is more rainfall in July and August, it will result in the slow release of controlled-release fertilizers and lose their sustained-release effect. Zhang Min said that this is also a misunderstanding. He said that a large number of experiments have shown that the rate of release of nutrients is almost the same in slow and controlled release fertilizers after coating, whether in soils with moderate water content or in soils with excessive water content. It rains a lot, and the reason why it affects fertilizer efficiency is that nutrients have not been absorbed by the crops, but they have gone along with the water flow, or they have infiltrated into the ground. “The two main factors affecting the release of nutrients from controlled-release fertilization are temperature and moisture. In corn fields, as long as the soil is not particularly drought, it will not affect the release rate.†Ningbo Nutrition Food Technology Co.,ltd. , https://www.collagenworkshop.com