(1) Sampling watermelon sampling area refers to vegetables, that is, taking a mixed sample in the range of 50 mu (according to the sampling specifications formulated by the Ministry of Agriculture). The sampling depth is 0-20 cm. Sampling must be mixed at a multi-point, with 15 to 20 samples per sample. Generally, S-shaped spot sampling is adopted, which can better overcome the errors caused by farming and fertilization. In the case of small terrain changes, relatively uniform ground forces, and small sampling unit area, plum-shaped spot sampling can also be used. It is necessary to avoid special parts such as roadsides, fields, ditch, and fertilizer piles. Sampling before planting watermelon in early spring. It is advisable to mix soil samples to take about 0.5-1 kg of soil.
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