Sustained, controlled-release fertilizer constant temperature quick nutrient leaching instrument

Abstract

The present invention provides a sustained and controlled fertilizer releasing constant temperature quick nutrient extracting instrument. The present invention comprises a constant temperature water tank, a sample extracting cup, a stainless steel sample mesh bag, a silicon controlled rectifier temperature controller, a temperature patrol instrument, an electric heater, a shell body, heat insulating material and so on. Pure water is used as medium in the constant temperature tank. The silicon controlled rectifier temperature controller is used for realizing the accurate control of the temperature. The upper body of the extracting cup is a rotary squeezing lid with a silica gel mat, which can effectively avoid the evaporation loss of water extract. The present invention solves the technicalproblem of nutrient releasing ratio quick extracting of the sustained and controlled release fertilizer at high water temperature in particular to in the 100 DEG C situation. The operation is simpleand an accurate testing result can be obtained. The present invention is suitable for quickly testing the nutrient releasing ratio of the sustained and controlled release fertilizer and the online quality detection of sustained and controlled release fertilizer manufacturers.

Description

(1) Field of invention [0001] The invention relates to an instrument for constant temperature and rapid nutrient extraction when measuring the nutrient release rate of slow and controlled release fertilizers. (2) Background technology [0002] The nutrient release rate of slow and controlled release fertilizer is a key measurement item to judge its quality. At present, the major controlled-release fertilizer manufacturers in the United States, Japan, Israel and Europe all extract the controlled-release fertilizer in water under constant temperature conditions, and then measure the extract. In order to quickly determine the release rate, the method of increasing the temperature of the extraction water is often used. At present, it is often used to seal the extract bottle and put it in a constant temperature incubator or constant temperature drying box. However, if the temperature is increased to 100°C, the leaching aqueous solution will boil, evaporate, etc., resulting in a larg...

AI Technical Summary

Problems solved by technology

The American Association of Official Agricultural Chemists (AOAC) uses a circulating constant flow pump connected to a chromatographic elution column and a 60°C water bath for continuous elution to extract nutrients from controlled-release fertilizers. It takes a long time for the temperature of the leaching column to reach the set temperature, and it is difficult to maintain a constant temperature. The plastic tubes used are prone to aging at high temperatures, and it is difficult to achieve rapid extraction at a temperature of 100°C.

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