Method for measuring residue amount of mulching film in damp farmland soil

Abstract

The invention discloses a method for measuring the residue amount of a mulching film in damp farmland soil, and relates to the technical field of agriculture. The method comprises the following steps:determining field measurement areas and positions of measurement points, wherein the measurement areas are selected in a manner of dividing a target measurement land into four along the midlines of the length and width directions and randomly selecting two diagonal areas as two deter measurement areas, each measurement area being a sample, and the measurement points are determined in each measurement area by use of a five-point sampling method; and extracting soil in a plough layer in each measurement point by use of a shovel, loading the soil in a plastic woven bag, carrying the soil near tonatural water, pouring the soil into an iron sieve, performing cleaning to remove the soil, sand and doped non-plastic substances such as crop straws and leaves, simultaneously cleaning a residual mulching film, air- in the shadow or drying with a drying oven the residual mulching film to constant weight, then weighing the residual mulching film by use of a balance, and calculating the residue amount of the mulching film. According to the method, the residue amount of the mulching film in the southern damp soil can be accurately measured, a measurement result is accurate, time is saved, and the labor intensity is reduced.

Description

technical field [0001] The invention relates to the field of agricultural technology, in particular to a method for measuring the residual amount of plastic film in wet farmland soil. Background technique [0002] With the increasing application of agricultural mulch in modern agriculture, it is not only used in the arid areas of Northwest my country, but even in Hainan Island, where the average annual rainfall reaches 1800 mm, mulch is widely used when planting winter melons and vegetables. The country pays more and more attention to the control of white pollution caused by residual mulch in farmland, especially in Northwest my country, where a large number of agricultural mulch is used, and the pollution is serious; due to the long-term implementation of the mulch standard is low, and most of them use ultra-thin mulch (thickness<0.006mm) , Most of them are broken after use, it is difficult to recycle, and the recovery rate is very low. Long-term use leads to more and mor...

AI Technical Summary

Problems solved by technology

In addition, the second national census of pollution sources led by the Ministry of Environmental Protection and the Ministry of Agriculture and Rural Affairs has been launched, including the amount of residual plastic film on farmland for accounting, but the specific residual amount is based on the existing national standards (GB / T 25413- 2010) cannot accurately determine the amount of residual mulch film in the wet soil in the south, which ultimately leads to guiding deviations in the implementation of white pollution-related control technologies

[0003] At present, the determination of the residual amount of farmland mulch film in China is only mentioned in GB / T 25413-2010 "Limits and Determination of Residual Amount of Farmland Plastic Film", and "Limits and Determination of Residual Amount of Farmland Plastic Film" only mentions Pick out the residual mulch film larger than 2cm, without clearly indicating how to pick it out

At present, in the arid area of ​​northern my country, the area with the largest amount of agricultural mulch film is used. Generally, the residual mulch film in the farmland is collected by mechanical raking or manual picking, and the recovery of the surface mulch film is relatively easy to operate.

It is understood that when some scholars measure the residual amount of agricultural film in the soil in the north, because the soil is relatively dry, the film and the soil are easy to separate without adhesion, and it is easy to separate directly with a sieve.

However, in southern my country, the soil humidity is high, and the adhesion between the plastic film and the soil is high. Especially in the soil where the plastic film has been used for many years, a large amount of plastic film has been plowed and buried in the soil. When measuring the amount of residual plastic film on a certain plot, it cannot be directly screened and separated.

The soil sample needs to be dried in the sun, and then further sieved, which takes a long time, heavy task, and the measurement efficiency is not high, and the residual plastic film wrapped inside the soil block is not easy to be separated, resulting in low measurement results

[0004] To sum up, the existing technology is inaccurate in measuring the agricultural land whose soil humidity in southern farmland is more than 70% all the year round, because the soil viscosity is high, and the large aggregates after plowing often contain some broken residual plastic film, which cannot be sorted out. The amount of mulch picked out is less than the actual residual amount, which leads to the deviation of the measurement results

In order to solve the problem of inaccurate measurement of mulch film residues in wet soils in southern China, it is necessary to design a method for the determination of mulch film residues in wet farmland soils

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