Behrooz Goudarzi; navab kazemi; Mohammad Amin Asoodar
Abstract
Soil compaction causes the lack of water and oxygen in the soil; therefore, development of the roots is restricted. Therefore, vibrating subsoilers recommended for better soil crushing and for increasing the power transfer efficiency from tractor to soil. The vibration used in the subsoiler is available ...
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Soil compaction causes the lack of water and oxygen in the soil; therefore, development of the roots is restricted. Therefore, vibrating subsoilers recommended for better soil crushing and for increasing the power transfer efficiency from tractor to soil. The vibration used in the subsoiler is available from the type of sweep and its main reason is the use of the tractor power axis (P.T.O) as the source of vibration creation. In this study a subsoiler, which was equipped with a rotational vibration system, was fabricated and used to provide rotational vibration, the vibration frequency control and the side of rotation, be controlled with electrical power. Factorial statistical design was performed in a completely randomized manner with speed and frequency, as independent variables. The dependent variables were: tillage depth, tillage cross section, clod mean weight diameter, tensile force and total energy. The effect of rotational vibration with confidence of 95% on tillage depth and with confidence of 99% on tillage side and mean weight of the clot was significant. Frequency (-36 Hz) had the best crushing of the soil. The effect of rotational vibration on tensile force was significant with confidence of 99% and the frequency (+36 Hz) had the lowest tensile force. The energy used for tillage was reduced with confidence of 99% and the frequency (+36 Hz) had the lowest energy consumption. By considering the amount of crushing for energy consumption, the marker was defined as the subsoiler efficiency (the amount of energy consumed for the crushing). The result of this marker is the priority of the rippering of the treatments with frequency (+36, -36, -18, +18 and 0 Hz) respectively.
Saman Abdanan
Abstract
The purpose of this research was to introduce a new laboratory test procedure which could be used under field condition. In this context, the performance of a pneumatic planter was investigated under laboratory conditions for maize, castor, fababean, sorghum, sugarbeet, watermelon and cucumber seeds. ...
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The purpose of this research was to introduce a new laboratory test procedure which could be used under field condition. In this context, the performance of a pneumatic planter was investigated under laboratory conditions for maize, castor, fababean, sorghum, sugarbeet, watermelon and cucumber seeds. The effect of operational speed and vacuum pressure were evaluated by examining the quality of feed index, precision in spacing (coefficient of variation), miss index and multiple indexes. The most suitable operating parameter values for maize, castor, sorghum and sugar beet seeds were obtained at the first level of operating speed and 4.0 kpa pressure; for watermelon seed: second level of speed and 4.5 kpa pressure; for cucumber seed: first level of speed and 4.5 kpa pressure. Furthermore, in order to determine the relationship between most important operating parameters affecting the performance of the Pneumatic metering device and seed physical properties, regression models were developed. According to the results, the vacuum pressure of Pneumatic planter could suitability and acceptably be described by two final models with values of root mean square error 6.7×10-2 and 5.7×10-2 and reduced chi-square 8.2×10-2 and 5.6×10-2 for the first and second model, respectively.
