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A method for detection and extraction of slow-acting potassium content in calcareous soil
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A calcareous soil, slow-acting potassium technology, applied in the direction of color/spectral characteristic measurement, test sample preparation, etc., to achieve the effects of avoiding spillage, convenient operation, and improving work efficiency
Inactive Publication Date: 2011-12-07
盐城市土壤肥料技术指导站
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[0003] In order to solve the above-mentioned problems existing in the existing detection and extraction methods, the present invention provides a method for detection and extraction of slow-acting potassium content in calcareous soil with convenient operation, fast detection speed, high efficiency and accurate measurement.
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Embodiment 1
[0018] The comparative example of the temperature change of the two methods of extracting solution
[0019] When the existing method is used to measure slow-acting potassium in calcareous soil, there is a large difference in the time before and after the boiling and heating of the extracts in the same batch of Erlenmeyer flasks, and the testing personnel are required to record the boiling start time (Table 1). During the boiling process, the heating temperature range of the electric heating plate is strictly required, which is difficult to control, and the extraction liquid is easy to overflow the bottle mouth. It is required to pay attention to the boiling of the extraction liquid in the triangular flask at any time. When the boiling is violent, move the triangular flask to the electric heating plate side to prevent the extract from overflowing the mouth of the bottle. Therefore, although the heating temperature can be controlled, there is still some variation in the temperat...
Embodiment 2
[0028] Comparison of detection precision of two detection methods
[0029] Select 5 soil samples, use the existing method and this method to extract the slow-acting potassium of the soil samples, 5 parallel, the same batch of leaching, test the error between the parallels of the two methods, the results are shown in Table 3.
[0030] Table 3 The precision comparison test of the two methods (mg·kg -1 )
[0031]
[0032] The coefficient of variation of the parallel sample detection results of this method is between 1.2-2.4, and is all less than 5.0%. The variation coefficient of the existing method parallel sample detection results is between 2.5-6.2. The method is small.
Embodiment 3
[0034] Comparison of the reproducibility of the two detection methods
[0035] Select 5 soil samples, use the existing method and this method to extract slow-acting potassium from the soil samples, repeat 5 times, extract 5 times, and test the reproducibility of the two detection methods. The results are shown in Table 4.
[0036] Table 4 Reproducibility test of two methods (mg kg -1 )
[0037]
[0038] The coefficient of variation of this method repeated sample detection result is between 1.2-3.3, is all less than 5.0%, and the variation coefficient of existing method repeated sample detection result is between 3.0-6.9, therefore, the error between this method repeated sample is higher than existing The method is small, indicating that the reproducibility of this method for detecting slow-acting potassium in calcareous soil is better than that of existing methods.
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Abstract
The invention relates to a method for detecting and extracting slow-acting potassium content in calcareous soil, comprising the following steps: 1. weighing 2.5 g of an air-dried soil sample that has passed through a 1mm sieve hole in a large test tube; 2. dripping a drop of vegetable oil into the large test tube , and then add 1mol·L-1HNO325ml; 3. Place the large test tube in a wire cage at the same time, put it in a 160°C oil bath to heat and boil for 11min, filter it while hot in a 100mL volumetric flask, and wash the soil and test tube with HNO3 solution 4 Second, use 15mL each time, and make constant volume after cooling; Fourth, directly measure in atomic spectrophotometer. In the present invention, by dropping a drop of vegetable oil into the soil sample, the overflow of the leaching solution is avoided, and the temperature of the leaching solution is relatively stable. After switching to a large hard test tube and oil bath heating, about 60 soil samples can be extracted at one time, which is convenient to operate and greatly improves work efficiency, especially suitable for soil slow-acting potassium of large batches of samples in the process of soil testing and formula fertilization. Determination.
Description
technical field [0001] The invention relates to a method for detecting soil chemical elements, in particular to a method for detecting and extracting slow-acting potassium content in calcareous soil. Background technique [0002] Soil slow-acting potassium has a good correlation with the yield of crops, and has been listed as a must-test item for soil testing in the Ministry and Provincial Soil Testing Formula Fertilization Subsidy Project. Currently, 1mol L -1 HNO 3 The boiling extraction method for determining the slow-acting potassium content of calcareous soil is as follows: weigh 2.50 g of air-dried soil samples passing through a 1 mm sieve into a 100 mL conical flask, add 1 mol L -1 HNO 3 25ml, add a small funnel with a curved neck at the mouth of the bottle, boil on a constant temperature electric heating plate for 10min, filter it into a 100mL volumetric flask while it is hot, and use 0.1mol L -1 HNO 3 The solution was used to wash the soil and the test tube 4 t...
Claims
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Application Information
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