A set of soil sieves, designed for the mechanical analysis of soil, is a useful device for a final cleaning of dry seeds. The coarsest sieve is at the top, and finest at the bottom. The seed is shaken through the sieves, and the coarse rubbish is trapped in the upper sieves, the seed is somewhere in one of the middle sieves, and the fine rubbish is lower down, or even at the bottom. However, soil sieves do not work well with wet seed, even when used with lots of water. This is because they tend to get clogged rather quickly.
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