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Rapid detection method for slow release period of polyurethane coated urea fertilizer, and applications thereof

A technology of coating urea and detection method, which is applied in the direction of analysis by chemical reaction of materials, measurement of color/spectral properties, and material analysis by observing the influence on chemical indicators, which can solve the problems of long cycle and natural dissolution. Long time, unfavorable fertilizer product development and other problems, to achieve the effect of enhancing exchange activities, improving dissolution rate, and high detection efficiency

Inactive Publication Date: 2017-11-21
SHENZHEN BATIAN ECOTYPIC ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to this method of the national standard, the period of testing the slow-release effect of fertilizers is too long, and fertilizers with good slow-release effects will naturally dissolve in soaking for a very long time. For example, fertilizers with a slow-release period of 90 days need to take at least 72 Genius can be dissolved naturally, which is very unfavorable for the development of fertilizer products

Method used

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  • Rapid detection method for slow release period of polyurethane coated urea fertilizer, and applications thereof
  • Rapid detection method for slow release period of polyurethane coated urea fertilizer, and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] S11, sampling the polyurethane-coated urea fertilizer with a known slow-release period (90 days) to obtain a sample A with a weight of 10 g (accurate sampling and weighing 0.01 g);

[0038] S12, put the sample A to be tested obtained in step S11 into a 250mL conical flask with a stopper, then add 200mL of distilled water, and use a constant temperature rapid nutrient extraction apparatus at 80°C (produced by Shandong Taian Hongtai Thermal Power Machinery Co., Ltd., model HKQT- 6) for leaching, the sampling time is 3h, 5h, 7h, 10h; in this step, it should be noted that when sampling the leaching solution, all the leaching solution should be filtered and transferred to a 250mL volumetric flask, and then set aside after cooling to room temperature. Allow. After each sampling, the filtered fertilizer is put back into the bottle, and then 200mL of distilled water is added, and the continuous extraction is continued after sealing; the extraction solution obtained each time is...

Embodiment 2-3

[0050] According to the same steps and process as the above implementation 1, the present embodiment 2-3 also detects the sample to be tested B and the sample to be tested C, the process will not be repeated here, the result data of the test is as follows:

[0051] Sample to be tested

[0052] It can also be seen from the calculation results of the above examples that the measurement period of coated urea can be greatly shortened by increasing the temperature. The detection that was previously at least 72 days to be completed can be completed within 20 hours by using the method provided by this patent. The detection is completed, and the correlation equation established through function relationship fitting is used to predict the nutrient release period, and the deviations are all within 4%, which is within the usual error range; the method of the invention has good practical significance.

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Abstract

The invention discloses a rapid detection method for the slow release period of a polyurethane coated urea fertilizer, and applications thereof. The rapid detection method comprises: leaching a fertilizer sample to be detected at a temperature of 80 DEG C, and detecting the dissolution rate of the leaching solution at a predetermined time; and calculating the slow release period of the fertilizer sample to be detected according to the detected dissolution rate, and a fertilizer leaching time related equation between temperatures of 80 DEG C and 25 DEG C. With the detection method of the present invention, on the basis of the slow release period detection method under the original national standard 25 DEG C condition, in the case of no damage on the film, the leaching temperature is increased so as to enhance the inside-film and outside-film ion exchange action and accelerate the nitrogen dissolution, such that the nitrogen is subjected to dissolution within the short time; and the related equation of the polyurethane coated urea slow release period is fitted compared to the coated urea release curve under the room temperature 25 DEG C condition, and according to the related equation, the dissolution rate can be rapidly determined and then can be converted into the fertilizer slow release period under the original room temperature 25 DEG C condition. The method of the present invention has high detection efficiency.

Description

technical field [0001] The invention relates to the technical field of slow-release fertilizer detection, in particular to a rapid detection method for the slow-release period of polyurethane-coated urea fertilizer. Background technique [0002] Slow-release fertilizers are a type of fertilizer in which the nutrient-containing compounds in the fertilizer release slowly in the soil or the nutrient release rate can be controlled to a certain extent for the continuous absorption and utilization of crops. Compared with the usual instant fertilizers, slow-release fertilizers On the one hand, it can avoid nutrient loss and damage to seedlings caused by excessive fertilization. On the other hand, it can reduce the loss of fertilizer nutrients, especially nitrogen, in the soil, thereby reducing the number of fertilization operations and improving the absorption and utilization of fertilizer nutrients by crops. Among them, polyurethane-coated urea fertilizer is a more commonly used s...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/78
CPCG01N21/31G01N21/78
Inventor 刘学文李峰张建军张闯
Owner SHENZHEN BATIAN ECOTYPIC ENG