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A kind of coated controlled-release fertilizer and preparation method thereof

A technology of coated controlled-release fertilizer and binder, which is applied in the direction of fertilization equipment, fertilizer mixture, application, etc., can solve the problems of reducing fertilizer utilization rate, not seeing silica sand, waste of ordinary compound slow-release fertilizer, etc.

Active Publication Date: 2015-10-28
BEIJING RECHSAND SCI & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The ratio of N, P, and K in ordinary compound slow-release fertilizers is fixed, but the demand for these three kinds of fertilizers changes during the growth of plants, which causes waste of ordinary compound slow-release fertilizers and reduces the yield of fertilizers. Utilization, at present, is urgently needed for other reports that can not see silica sand in coated controlled-release fertilizers

Method used

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  • A kind of coated controlled-release fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0036] Example 1-6: Coated controlled-release fertilizer

[0037] 1. Raw materials: see Table 1

[0038] Table 1: Raw material ratio of each embodiment

[0039]

[0040] 2. Preparation method:

[0041] method one:

[0042] 1) Mix the ingredients A, B, and C separately, and set aside;

[0043] 2) Put the silica sand and A into the sand mixer, and after mixing the sand for 2 minutes, add 0.3L of 20% polyvinyl alcohol solution (equivalent to 30% of the added binder);

[0044] 3) Add B to the sand mixer in step 2) and mix sand for 2 minutes, and add 0.3L of 20% polyvinyl alcohol solution (equivalent to 30% of the added binder);

[0045] 4) Add component C to the sand mixer in step 3) and mix sand for 2 minutes, add 0.4L of 20% polyvinyl alcohol solution (equivalent to 40% of the added binder), take it out, and dry it at 30°C.

[0046] Method Two:

[0047] 1) Mix the ingredients A, B, and C separately, and set aside;

[0048] 2) Put the silica sand and component B into th...

experiment example 1

[0069] Experimental example 1: detection of nutrient release speed

[0070] 1. Test the release rate of the coated controlled-release fertilizer provided in Examples 1-5 and Comparative Example 1 and Comparative Example 2 (Example 1 of CN200410050221.6 (publication number is CN1587235A), among them, Examples 1-5 The preparation methods are method 1, method 2, method 3, method 4 and method 1 in sequence, and the specific detection methods are:

[0071] Dissolve 100 grams of slow-release fertilizer in 500ml of water, measure the concentration of each nutrient in the water every other week, calculate the dissolved quality of each nutrient, and the mass ratio (percentage) of each nutrient that should be contained in 100 grams of slow-release fertilizer, of which nitrogen fertilizer adopts Kai The nitrogen determination method was used for detection, the phosphate fertilizer was detected by the phosphorus molybdenum blue colorimetric method, and the potassium fertilizer was detecte...

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Abstract

The invention relates to a coated controlled-release fertilizer, which comprises the following raw materials: silica sand, a component A, a component B, a component C and an additive binder, wherein the component A, the component B and the component C are respectively a combination containing different ingredients such as nitrogen, phosphorus and potassium fertilizers. A traditional controlled-release fertilizer is single in fertilizer, or dissolution rates of nitrogen, phosphorus and potassium are basically same and influenced each other, and in each stage of plant growth, some nutritive substance which is not required by plants is wasted, so that the utilization ratio of the fertilizer is reduced. Compared with an existing controlled-release fertilizer, the coated controlled-release fertilizer provided by the invention is coated with nitrogen, phosphorus and potassium in a layered mode, and can release different fertilizers according to the differences of plant growth processes so as to meet the needs of plant growth. In addition, besides having an effect of releasing fertilizers in a controlled release mode, the coated controlled-release fertilizer also has a water absorption and retention effect.

Description

technical field [0001] The invention relates to a coated controlled-release fertilizer, in particular to a coated controlled-release fertilizer and a preparation method thereof. Background technique [0002] Slow / Controlled Release Fertilizers (CRFs) is a combination of modern plant nutrition and fertilization theory and controlled release high-tech, and considers the law of crop nutrition requirements, adopts a certain regulation mechanism technology to delay or control the release of fertilizers in the soil A new type of fertilizer that coordinates or synchronizes its nutrient release pattern with crop nutrient uptake. [0003] The International Fertilizer Industry Association divides slow-release and controlled-release fertilizers into two categories according to the production process. One is the condensate of urea and aldehydes, which are called slow-acting or slow-release fertilizers; the other is coated fertilizers, which are called controlled-release fertilizers. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
Inventor 秦升益刘春雨白慧文
Owner BEIJING RECHSAND SCI & TECH GRP
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