AGRONOMIJAS VÄSTIS - Latvijas LauksaimniecÄ«bas universitÄte

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<strong>AGRONOMIJAS</strong> VĒSTIS (Latvian Journal of Agronomy), No.10, LLU, 2008Kernels with undetached hulls, % 120181614121086420900 1100 1250 900 1100 1250 900 1100 1250KM -2084 SW-1291 CDC FreedomFigure 1. Influence of drum speed increase (rpm) on hull separation:2003 2004 2005 2006The reduction of the distance between drum and concave at 1250 rpm drum speed had asignificant effect on the amount of broken kernels in dry threshing conditions (2003 and 2006,Table 3, Fig. 2). In both years a significant increase of broken kernels was found for ‘CDCFreedom’, and the amount exceeded the 4% level showing that one should be careful with thereduction of distance between the drum and concave for sensitive varieties. If grain with highmoisture content was harvested (2004), the differences in the amount of broken kernels wereminor. In most cases this reduction improved hull separation and volume weight, but the effect wassignificant only for SW-1291 in 2006 (differences 4.3% and 21 g L -1 respectively). It did notadvance grain quality for food requirements.Broken kernels, %765432104 2(3) 4 2(3) 4 2(3)KM -2084 SW-1291 CDC FreedomFigure 2. Effect of reduction of distance between threshing drum andconcave (mm) on amount of broken kernels using 1250 rpm drum speed:2003 2004 2005 2006142
<strong>AGRONOMIJAS</strong> VĒSTIS (Latvian Journal of Agronomy), No.10, LLU, 2008Table 3 The Influence of drum speed increase and the reduction of distance between the threshingdrum and concave on quality parametersThreshingKernels withKernels withVolume BrokenmodesYear undetachedgermweight kernelsanalysedhullsdamageGerminationIncrease of drum speed2003 p
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