Slowly controlled release fertilizers generally control the nutrient release rate by coating the outer film of chemical fertilizer particles, thereby achieving the purpose of slowing the nutrient release rate. Therefore, the outer film of slow-release fertilizer is often colored. At present, most of the slow-release fertilizers on the market are blended with ordinary fertilizers. In this way, nutrients are provided by ordinary fertilizers in the early stages of crop growth, and they are mainly provided by slow-release fertilizers in the middle and late stages of growth.
Zhang Min therefore suggested that after opening the package of slow-release fertilizer, 100 fertilizers can be randomly taken and the number of colored fertilizer particles should be counted. If the number of colored particles exceeds 15, the slow-release fertilizer content is 15%. Is a qualified product. If it fails, it fails.
In response to the situation that bad manufacturers deliberately dyed ordinary fertilizers to pretend to slow and control fertilization, Zhang Min suggested that you can put the fertilizers in water and soak them, usually the dye 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-release fertilizers is specialized. Slow-release fertilizers for corn, cotton, rice and other crops have release cycles in two or three months." Zhang Min Say.
In order to further evaluate the quality of slow-release fertilizer, Zhang Min suggested that slow-release fertilizer can be cooked in boiling water. If the release cycle is two to three months of slow and controlled release fertilizer, all of them are released within half an hour, indicating that the quality of slow and controlled release is average; if only part of the release is released, the quality is acceptable.
"If time permits, you can also soak the slow-release fertilizer in cold water for a week or two to see the release. If the slow-release fertilizer is released for two months, about a quarter of the half-month release is qualified. Products. "Zhang Min said.
When purchasing slow-release fertilizers, farmers need to obtain corresponding purchase vouchers in addition to buying from regular stores and choosing products from large enterprises.
At present, the area of ​​summer maize with slow-release fertilizer for simultaneous seeding is increasing. Many farmers believe that if there is a lot of rain in July and August, the slow-release fertilizer will be released earlier and the slow-release effect will be lost. Zhang Min said that this is also a misunderstanding. He said that a large number of experiments have proved that the slow and controlled release fertilizer after coating, the nutrient release rate is almost the same whether it is in soil with moderate water content or soil with too much water. It rains a lot, and the reason for affecting fertilizer efficiency is that the nutrients have not been absorbed by the crops, so they run away with the water, or they seep into the ground. "The two main factors that affect the release of nutrients from slow and controlled release fertilization are temperature and moisture. In corn fields, as long as the soil is not particularly dry, it will not affect the release rate."
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Access Control Keypad is a security product that can be connected to a lock and unlocked by swiping card, password, fingerprint, mobile phone, etc. Residents can connect the access control keypad to the electric lock, Magnetic lock , etc., and then control the door opening by access control keypad.
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