the relationship between calibrated and actual field seed rates of the external fluted wheel seed metering device with the use of wide level disk harrow

Lotfie A. Yousif



a field experiment was conducted, at Gedarif University Research Farm, for two consecutive seasons (2006/07 and 2007/08). The objectives of the experiment were to determine the accuracy of external fluted wheel seed metering devices for seeding crops by determining the relationship between the calibrated and actual seed rates for different crops. A wide level disk seeder box equipped with seed metering devices of the external fluted wheel type was used. Five crops of different seed sizes were tested. The calibrated seed rate was determined, using the conventional method when the machine was motionless, and the actual seed rate was determined by using cloth bags to receive seeds when the machine was in motion. The results revealed that actual seed rates were significantly lower than calibrated seed rates for all tested crops. The actual seed rate was 95%, 88%, 96%, 95% and 85% of the calibrated seed rate for sorghum, millet, sesame, sunflower and cotton, respectively. High linear correlations (R2 = 0.99) between the actual seed rate (dependent variable) and calibrated seed rate (independent variable) were found for all tested seeds. These findings are of considerable importance to farmers and engineers, who use the wide level disk with such type of seed metering devices, to substitute for the reduction in the seed rate in the field.

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