Several problems in preparing soil samples

Soil sample collection method

The collection of soil samples is an important part of soil analysis. The collection of representative samples is a prerequisite for the fact that the results of the measurement faithfully reflect the objective conditions of the area or plot it represents. The original sample is the field collecting sample that can represent the object of analysis. Before it is sent to the laboratory for analysis, it must be fully mixed; the sample after the sample is divided into the average sample; the sample is the average sample is ground, dried , sieving and other steps are processed. When analyzing and measuring, it is weighed from the analysis sample and the result can represent the target soil.

The key to obtaining the correct analysis results is to adopt the correct sampling method to ensure the accuracy and representativeness of the soil test data. 4 The amount of soil samples collected is appropriate to take 1 kg of soil (0.5 kg for recommended fertilization, More than 2 kg for field trials and arable land fertility assessment (can be stored for a long period of time). The excess soil can be discarded by quartile method. The method is to place the collected soil samples on a plate or plastic sheet, crush, mix and spread into squares, diagonally divide the soil sample into 4 parts, and merge 2 pieces of diagonals into 1 piece. 1 copy, discard 1 copy. If the resulting sample is still large, it can be treated by quartering until it reaches the required amount.

Soil sample collection time

The time of collection of the soil samples is determined by the purpose of the analysis. In order to formulate a full-year production plan, fertilizers should be reasonably distributed according to the plots. The sampling time must be carried out at the late stage of crop reproduction, or after harvesting and before fertilization; the orchards are collected before the first fertilization after the fruit is picked; in order to diagnose crop nutrient needs and decide on top dressing When it is done, it should be carried out during the growing period of the crops; the facilities vegetables should be collected during the hanging period; when recommending the nitrogen fertilization, it should be collected before the top dressing or during the critical period of crop growth; in order to improve the soil or improve the cultivation techniques, etc., Before and after the measures, the relevant items shall be sampled and analyzed; the saplings and orchards without fruit shall be collected before the expansion of the hole in the clear garden.

Soil sample collection records

First, the sampling time should record the sampling date, including year, month, and day. The second is the location and number of sampling, the use of GPS to determine the latitude and longitude of field sampling points, and record their province, county, village, farmer and geomorphological characteristics. The third is the sampling method, including sample configuration method, the number of mixed sampling points, sample spacing, sampling depth, and so on. The fourth is the basic situation of sampling sites, including the slope, terrain, and utilization of wasteland, farmland, and forest land. Fifth, sampling personnel and other sampling-related situations and situations that need to be explained.

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