Double-membrane double-control slow release fertilizer

Abstract

The invention discloses a double-membrane double-control slow release fertilizer. The slow release fertilizer is prepared by wrapping urea by using sulphur and further wrapping by using a layer of soluble resin, and mixing the urea of a double-membrane material with a stable composite fertilizer, wherein the fertilizer nutrient release period can be 130 days, the release rate of 25 days can be 30%, and the release rate of 120 days can be more than 85%; the urea wrapped by double membranes is used for controlling the release of a urea state nitrogenous fertilizer, the release of the nitrogenous fertilizer is controlled and the utilization rate of a phosphatic fertilizer is increased through the stable fertilizer; the slow release fertilizer is longer and slower in action; for ordinary crops, the effect that the fertilizer is applied once without further fertilization is achieved; the utilization rate of the nitrogenous fertilizer is increased by 15%; and the utilization rate of the phosphatic fertilizer is increased by 12%. The urea inhibition ratio is 30%, the nitrogenous fertilizer nitration inhibition ratio is 25%; the wrapping membrane material can be degraded within 150 days; and meanwhile sulfur element is supplemented for the soil.

Description

technical field [0001] The invention belongs to the technical field of slow-release fertilizers, in particular to a double-film double-control slow-release fertilizer. Background technique [0002] In the existing technical production, because it is more technical than single-packed sulfur, the required equipment and facilities are more complicated, and the resin film material must be water-soluble, so the cost is higher than that of slow-release fertilizers. The cost of release fertilizer is nearly 200 yuan per ton higher than the promotion of field crops. But it can be widely promoted in cash crops, various fruits and vegetables and precision agriculture. [0003] Existing slow-release fertilizers are made by mixing sulfur-coated urea (or resin-coated urea) with ordinary compound fertilizers. The nutrient release period of the fertilizer is 100 days, and the release rate reaches about 50% in 25 days. The release period is relatively short, and the long-term effect cannot...

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Problems solved by technology

The release period is relatively short, a

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