Qualitative analysis of wheat grain damage during harvesting with John deere combine harvester
2008
Lashgari, M. (Tehran Univ., Karaj (Iran). Dept. of Agriculture Machinery) | Mobli, H. (Tehran Univ., Karaj (Iran). Dept. of Agriculture Machinery) | Omid, M. | Alimardani, R. | Mohtasebi, S.S.
Effects of forward speed, cylinder rotation and clearance between combine's cylinder and concave on wheat kernel breakage and seed germination were studied through analysis of variance. Three levels of adjustments for each of the variables, namely 1.2, 1.8 and 2.5 km h-1 for forward speed, 800, 900, 1000 rpm for cylinder rotation and 15, 20 and 25 mm for the clearance between cylinder and concave were constituted the variables. Results indicated an increase in kernel breakage and a decrease in seed germination due to decrease in forward speed, increase in cylinder rotation and decrease in clearance between cylinder and concave. The interaction between forward speed and cylinder rotation indicated a least kernel breakage of 5.47% along with the most seed germination of 96.61 % arising from a forward speed of 1.8 km h-1 together with cylinder rotation of 800 rpm. Also, an interaction between cylinder rotation and concave clearance indicated a least kernel breakage of 5.38% at 900 rpm and 25 mm, respectively. A maximum seed germination of 96.58% was observed for the same above figures of cylinder rotation and clearance between cylinder and concave. Interactions between other combinations were non-significant. The most suitable adjustments for 955 model John Deere combine in the studied area would be 800 and/or 900 rpm, 1.8 km h-1 and 25 mm for cylinder rotation, forward speed and cylinder concave clearance, respectively.
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