EFFECT OF DRYING TEMPERATURES ON STRESS CRACKS AND BREAKAGE SUSEPTIBILITY OF CORN GRAINS | ||||
| Misr Journal of Agricultural Engineering | ||||
| Article 24, Volume 26, Issue 1, January 2009, Page 453-468 PDF (376.02 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/mjae.2020.110163 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Mohamed I. Shoughy1; Sammy A. Marey1; Abbas A. El-Shenawy2 | ||||
| 1Researcher at the Agric. Eng Res. Inst. (AEnRI), Dokki, Giza, Egypt. | ||||
| 2Chief Researcher and Head of the corn Res. Sec., Field Crops Res. Inst., Giza, Egypt. | ||||
| Abstract | ||||
| Stress cracking of two corn hybrids (White, SC-10 and Yellow, SC-162) dried at various temperatures (35, 50, 60, 75 and 100oC) from 21.2% to 13% moisture content and tempered for 24hr at ambient temperature (221 oC with available relative humidity) were tested. A breakage tester (BT-drop tester) was manufactured and a single-grain breakage susceptibility of two corn hybrids at various grain temperatures and times after drying (0, 3 ,6 , 10, 20 and 30min) were evaluated. The results indicated that, the damage index significantly increased as the drying temperature increased for two corn hybrids except at 100oC with SC-162, it was decreased. The SC-162 was more susceptible to cracking more than SC-10 hybrid especially at lower grain temperature. Also, the predicted models and observation showed that both hybrids were plastic and had minimal breakage susceptibility at high grain temperatures from 72 to 93oC, while, decreasing grain temperature increased breakage exponentially. After drying at both 75 and 100oC, the breakage of the two corn hybrids increased rapidly for the first 10min after drying and reached an asymptotic level after around 10min cooling after finishing drying at ambient temperature. At the same drying temperature (75oC), the breakage susceptibility increased by 37.4% for SC-10 and by 51.5% for SC-162 with the average stress cracks (multiple and checked) kernels for two hybrids of about 20.2%. | ||||
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