A method for measuring nutrients in soil

Abstract

A method for measuring nutrients in soil is disclosed. The method includes a sampling step, namely a step of sampling the soil, with the sampling depth being 0.5-1.5 m; a solution preparing step, namely a step of weighing 10 parts by mass of the sieved soil, adding 80-100 parts by mass of deionized water into the soil, adding 2-3 parts by mass of an extracting agent into the mixture, stirring themixture at a high speed of 2000-3000 r / min for 10-20 min, and then stirring the mixture at a rotating speed of 40-60 r / min to achieve hydration; a step of allowing the mixture to stand, namely a stepof allowing the liquid mixture obtained in the step A2 to stand at 30-40 DEG C for 2-3 h; a step of separation, namely a step of inserting two electrode plates into the liquid mixture, and inputting steep pulse current to the two electrode plates, with the peak value of steep pluses being 150-180 V, the pulse width being 0.5-0.8 ms, the repetition frequency being 200-300 kHz, and the pulse steepness being 50-100 ns; a step of centrifugation, namely a step of adding a separated liquid obtained in the step A4 into a centrifuge, and performing centrifugation at a rotating speed of 10000-15000 r / min; and a step of measurement, namely a step of drawing a liquid supernatant after centrifugation, and measuring nutrients in the liquid supernatant by utilizing an ultraviolet-visible light spectrophotometer. When the method is used for measuring nutrient ions in soil, measured data are more accurate and the measurement efficiency is higher.

Description

technical field [0001] The invention relates to the technical field of soil detection, in particular to a method for measuring nutrients in soil. Background technique [0002] Vegetation is an indicator of the natural environment around us, and studying vegetation is one of the important means to reveal the laws of nature. The existence of any plant community is closely related to its altitude, climate, hydrology, topography, soil and other environments. Vegetation characteristics and their relationship with the environment have always been one of the core issues in the study of vegetation ecology. The relationship between plant community distribution, species composition and diversity and environmental factors are three important aspects in the study of the relationship between vegetation and the environment. Research on the relationship between vegetation and the environment abroad has always been in a leading position, and a large number of models have been established a...

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Problems solved by technology

[0004] Any kind of plant grows depending on the soil, and it directly obtains nutrients and water from the soil. Therefore, the research and analysis of the soil components in the environment where the vegetation is located plays a very important role in the study of vegetation. When researching and analyzing the nutrients in the soil, the current method is basically: dry the soil sample, grind, sieve, extract, dilute, color develop and other pre-treatment processes to prepare the solution to be tested, and then use UV-Vis spectrophotometry However, the nutrient content of the soil sample may change with the evaporation of soil water during the air-drying process, and it may also be affected by environmental factors such as temperature and microbial activity. As a result, it is difficult to guarantee the measurement reliability. Although the combined extraction method can improve the efficiency of soil nutrient testing, there are certain differences between the measurement results and conventional soil chemical analysis. Therefore, there is an urgent need for a method that can improve soil nutrient. A method that improves the measurement efficiency and improves the accuracy of nutrient determination in soil

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