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Stress cracking of two corn hybrids (White, SC-10 and Yellow, SC-162) dried at various temperatures (35, 50, 60, 75 and 100C) from 21.2% to 13% moisture content and tempered for 24hr at ambient temperature (22± 1 C 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 100C 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 93C, while, decreasing grain temperature increased breakage exponentially. After drying at both 75 and 100C, 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 (75C), 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%. INTRODUCTION ecently, the government tends is expand the growing area of corn (Zea Mays L.) to limit the shortage of wheat production and to approach self-sufficiency for bread by mixing corn with 1 Researcher at the Agric. Eng Res. Inst. (AEnRI), Dokki, Giza, Egypt. 2 Chief Researcher and Head of the corn Res. Sec., Field Crops Res. Inst., Giza, Egypt. R Misr J. Ag. Eng., 26(1): 453468 PROCESS ENGINEERING

EFFECT OF DRYING TEMPERATURES ON STRESS CRACKS AND BREAKAGE SUSEPTIBILITY OF CORN GRAINS