Determination of threshing force for three common rice varieties under dynamic conditions

Yavari, Soheila and Askari Asli-Ardeh, Ezzatollah (2010) Determination of threshing force for three common rice varieties under dynamic conditions. Other thesis, University of Mohaghegh Ardabili.

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Abstract

The One of the important biomechanical properties of rice crop which is utilized at harvesting and post harvesting machines, is threshing force or requirement force for detachment of grain from panicle. This factor have important role at power requirement of threshers and combines, threshing efficiency and shattering losses. At this study,Instron systemtension and pressure testing instrument and special clamps were used for measuring of the detachment force. the value of this force was analyzed in three common paddy rice varieties (Hashemi,Khazar and Hybrid in Gilan province), three levels of moisture content (12, 15, 22%w.b.), four levels of speed (5, 20, 35 and 50 mm/min), three directions of force applied to the rice grain (parallel to grain, perpendicular to the front of grain and perpendicular to the side of the grain) and three portions of panicle (upper, middle and lower). Randomized complete block design was applied for analyzing of data with five replications. Data means were compared statistically. The results of variance analysis showed that threshing force is different significantly in tested varieties. The grain moisture content, direction of applied force, the speed of applied force and the selection location of spikelet (grain) on panicle affected significantly on the threshing force. The highest threshing force (2.62N) was obtained for Hashemi variety, the grain moisture content (16% w.b.), direction of applied in parallel (tensile) to grain, with speed 35 mm/min and upper portion of panicle.

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