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In order to obtain a correct and always reproducible image of the performances achieved by a planter (or any agricultural machine), laboratory tests are required, under specified conditions, well controlled, to determine the precision of sowing outside the optimal agricultural periods. The paper presents a theoretical model for estimating sowing precision (feed quality index) as a polynomial function of the second degree, dependent on seed norm per hectare, working speed, depression value, mass of 1000 seeds, as well as combinations thereof.
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Cujbescu et al. (2020) studied this question.
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