Structural optimization method of rice precision direct seed-metering device based on multi-index orthogonal experimental.

As shown in Figure 6 , with the increase of hole diameter, the qualification rate of seeds per hole y 1 first increases and then decreases, the coefficient of variation of seed number y 4 first decreases and then increases, the coefficient of variation of hole spacing y 6 first decreases and then increases, the average seeds per hole y 3 shows an increasing trend, the empty hole rate y 2 is zero, and the average hole spacing y 5 is almost unchanged.

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