Three points for preparing soil samples

Three points for preparing soil samples

The first step in soil analysis is to collect soil samples. The quality of soil samples determines the accuracy of soil analysis results. Aluminum boxes, ring knives, and soil grinders are all essential equipments for preparing soil samples. What should be noted in soil sample preparation?

1 The amount of soil samples collected

The mixed sample is suitable for taking soil around 1 kg (0.5 kg for recommended fertilization, more than 2 kg for field test and farmland fertility evaluation, and can be stored for a long time), and the extra soil can be discarded by quartering 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. Share, discard 1 copy. If the resulting sample is still large, it can be treated by quartering until it reaches the required amount.

2 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 should be collected before the first fertilization after the fruit is picked; in order to diagnose crop nutrient needs and decide to top-dress fertilizers. 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 should be sampled and analyzed; young trees and un-fruited orchards should be collected before the expansion of the hole in the clear garden.

3 Collection and record of soil samples

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 its province, county, village, farmer and geomorphological characteristics. The third is the sampling method, including the sample configuration method, the number of mixed sampling points, the sample spacing, and the sampling depth. 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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