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DEVELOPMENT AND PERFORMANCE EVALUATION OF A PEDESTRIAN CONTROLLED RICE STRIPPER
ABSTRACT
A pedestrian controlled rice stripper was then designed, fabricated and its performance was evaluated on a field with farro 44 variety of rice. The total estimated power required to operate the harvester was 2.33kw, while the stripping unit required only 0.78kw of the total power. In evaluating the harvester’s field performance, randomized complete block design (RCB) was adopted to study the effect of harvester’s forward speed, stripper rotor speed, stripper rotor height, harvested grain purity, field capacity, fuel consumption and harvester efficiency. Results showed that time taken had high significant effect at 1% level on the harvester’s forward speed. The shattered loss showed both linear and polynomial trend of increase as the harvester’s forward speed increases. The stubble loss increases linearly and polynomially as both stripper rotor speed and harvester’s forward speed increases. Lodging losses also increased both linearly and polynomially as the stripper rotor speed and harvester forward speed increases at two levels of rotor heights 270mm and 220mm. The time taken to harvest had high significant effect at 1% level on the harvester forward speed, at two levels of the rotor heights. Also the fuel consumption decreased in a polynomial trend as the stripper rotor speed increased at the two levels of rotor heights 270mm and 220mm. At stripper rotor height 270mm, harvester forward speed of 3km/h and stripper rotor speed of 670rpm gave the lowest total losses. These combinations gave shattered loss as 5.46%, stubble loss 4.97% and lodging loss 3.08% of the total yield at 270mm rotor height. Also the effective field capacities was 0.078 ha/h; and fuel consumption was 27.6 litres/ha, the harvester’s efficiency at the same settings was 81 percent and grain purity was 90.3% at the same machine settings.
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