Performance study of three types of animal drawn plows.

Date

1984

Abstract

The objective of this study was to determine the power requirement, field capacity and field efficiency of different plows. Three types of animal drawn plows (Philippine native plow, Thailand improved plow and IRRI standard moldboard plow) were used in this study. A power tiller was used as a power source and a hitch assembly was designed to accommodate the three (3) plows. A load cell with strain gage transducer connected to an amplified and an oscillograph recorder was used to measure and record the draft of the plows. Test results were expressed by linear equation for total draft, power, field efficiency and effective field capacity versus plowing depth, and power equation for unit draft versus plowing depth. The linear regression equations were also used for specific soil resistance versus soil depth, unit draft versus shear or frictional resistance,modified by plasticity index and quadratic equation was used for shear resistance versus versus shear resistance modified by plasticity index. Test results indicated that total draft force and unit draft increases with an increase in plowing depth both in upland and lowland conditions. The effective field capacity, field efficiency and power requirement of plows varied with plowing depth. The total draft, unit draft, effective capacity, field efficiency and power requirements were higher in upland condition than in lowland condition. The effective field capacity and field efficiency of IRRI plow was higher than the Thai and Philippine plow. Based on Hopfens estimate, all three types of plow (philippine, Thai and IRRI) are expected to work up to 8 cm plowing depth in lowland and 5 cm plowing depth in upland condition within the actual power range of 0.471 to 0.723 hp. The energy requirement for Philippine, Thai and IRRI plows were 53.53, 69.04 and 82.52 hp-hr 57.34, 75.05 and 68.92 hp-hr 42.76, 60.15 and 79.63 hp-hr at 5,8 and 12 cm plowing depth in upland, respectively and the corresponding value of the Philippine, Thai and IRRI plows were 59.40, 52.88 and 51.81 hp-hr, 52.26, 51.61 and 59.40 hp-hr 30.38, 35.30 and 43.01 hp-hr at 5,8 and 12 cm plowing depth in lowland condition, respectively. The specific soil resistance was increased with the increase in soil depth both in upland and lowland conditions and greater specific soil resistance in upland than in lowland condition. The shear or frictional resistance was increased with the increase in soil depth and the applied normal force in upland but shear resistance was increased only with the increase of applied normal force in lowland. No significant increase or decrease of shear force was found in lowland condition.

Document Type

Master Thesis

Degree

Master of Science in in Agricultural Engineering

Language

English

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