Soil testing formula fertilization soil sample collection method:
1. Mining tools: flat rafts, cloth bags, labels, etc.
2. Sampling unit: Collect 1 soil sample per 100 mu of contiguous arable land.
3. Number of sampling points: Generally, the sampling points of each soil sample are determined to be 9-20. If the plot is flat, the X-shaped sampling method can be used.
4, sampling depth: sampling depth is generally 0-20 cm.
5. Sampling route: Sampling should be carried out along a certain route according to the principle of “randomâ€, “equal amount, “multi-point mixingâ€. Generally, S-shaped spot sampling is used, and X-shaped spot sampling can also be used. Special locations such as roadside, Tianyu, ditch, and fertilizer piles.
6. Sampling method: The depth of the soil and the sampling amount of each sampling point should be uniform, and the ratio of the upper layer to the lower layer of the soil sample should be the same. The sampler should be placed perpendicular to the ground and at the same depth. Sampling with a soil shovel should first shovel a section and then shovel the soil parallel to the section.
7, mixed soil sample production
It is advisable to mix a soil sample with about 1 kg of soil. If the number of mixed samples is too large, the excess soil can be discarded by the quadruple method. The method is to put the collected soil samples on a plate or a plastic cloth, crush and mix them, and lay them into squares, divide the soil samples into four parts diagonally, and combine the two diagonal pieces into one part, and keep them. One, discard one. If the sample obtained is still large, it can be treated again by the quartering method until the required amount.
8. Fill in the labels: name, location, plot, latitude and longitude. Unified number: ****** (zip code) G20080401 (time) + township pinyin + three digits. The collected samples should be placed in a uniform sample bag. The label must be written in 2B pencil (it is easy to be contaminated by soil samples with a pen). The labels are in duplicate and one inside and outside the bag.
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