طراحي ، ساخت و ارزيابي آزمايشگاهي موزع شياري غلتكي مناسب براي كشت كپه اي

Design Construction and Laboratory Evaluation of a Roller Type Metering Device for Hill Dropping

Recently researches showed that precise hill dropping was better than drill planting for several crops such as rice, bean and corn. This study was carried out to design and evaluate a roller type-metering device suitable for hill dropping. Two planting units consisting of seed tank, metering device, brush, drive shaft and bearings were designed and constructed. A completely randomized factorial design with five replications was used. The factors were the roller diameter (60 and 70 mm) and three tractor forward speeds (3, 4 and 5 kmlhr). The dependant variables were SDR (Scattering Distance Ratio) index, seed damage rate and the amount of seeds planted per hectare. Analyses of data indicated that SDR index was significantly different between the treatments and that of obtained from the conventional fluted feed metering device. The effects of the two factors also were significant on the SDR index. There was significant difference among the treatments and control on seed damage rate. The effects of levels of the forward speed on seed damage rate were significantly different. The seeding rate was significantly different among the treatments and control.According to the results and the fact that the roller type metering devices are structurally simple and regarding their easier production, they are advisable for precision hill dropping. It is wort noting that this type of planters with suitable brush and lower forward speeds will provide better results.