Author(s):

Dr. M Manoharan

Abstract: Laboratory test rig was developed with the following independent variables for achieving desired seed rate for black gram variety VBN-3. Cell geometry (S) - 3 levels -Maximum seed dimension - 4.25 mm, 10 per cent more than maximum seed dimension - 4.67 mm and 25 per cent more than maximum seed dimension - 5.31 mm. Inclination of seed metering disc (q) - 4 levels - 30°, 35°, 40° and 45°. Peripheral speed of seed metering disc (V) - 4 levels - 0.1 ms^-1, 0.15 ms^-1, 0.2 ms^-1 and 0.25 ms^-1. From the experiments it was inferred that, with the cell geometry same as that of maximum seed dimension, increase in peripheral velocity from 0.10 to 0.25 ms^-1 resulted in 9.6, 0.5, 2.3 and 4.4 per cent increase in seed rate at 30°, 35°, 40° and 45° inclination of seed metering disc respectively. When the cell geometry was 10 per cent more than maximum seed dimension, the peripheral velocity and inclination of seed metering disc had a marginal effect on seed rate. The variation in seed rate was from 20.20 to 21.00 kg ha^-1. For the cell geometry having 10 per cent more than maximum seed dimension, the combination of all selected levels of peripheral velocity and inclination of seed metering disc yielded the desired seed rate of 20 kg ha^-1. The effect of inclination of seed metering disc on seed rate was negligible when the cell geometry is same as that of maximum seed dimension.

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