Effects of Drying Temperature and Final Grain Moisture Content of Paddy On Grain Cracks
Paddy is one of the most important grains that need to be dried before storage andmilling process. The most important factors that have a remarkable effect on rice quality losses aredrying temperature and final moisture content. Thus in this research, two basic factors of crackingin the milling process were investigated using factorial experiment by randomized complete blockdesign with three replications. The independent variables included: rice variety (Bahar1 andTarom), drying temperature (40, 45, 50 and 55°C) and final grain moisture content (10-11, 11-12and 12-13% w.b.). Results showed that the Tarom variety was more sensitive to cracking. AlsoTarom variety was sensitive to temperature of drying while Bahar1 variety was more sensitive tofinal grain moisture content. Drying temperature of 40 and 45°C and final moisture content of (12-13)% is recommended to decrease amount of cracking for Tarom and Bahar1 varietiesrespectively.
___
- Alizadeh M.R., S. Minaei, T. Tavakoli, M.H. Khoshtaghaza,
2006. Effect of de-awning on physical properties of
paddy. Pak J Biol Sci. 9: 1726-1731.
- Alizadeh, M.R. 2011. Effect of paddy husked ratio on rice
breakage and whiteness during milling process.
Australian journal of crop science. 5(5):562-565
- Arefi, H.A. 2000. The effect of drying temperature and
moisture content of paddy grain on milling efficiency of
Amol 3 and Haraz varieties. The 6th Iranian crop science
congress. Babolsar. IRAN.
- Cihan, A., K. Kahveci, O. Hacihafizoglu, 2007. Modelling of
intermittent drying of thin layer rough rice. Journal of
Food Engineering, 79: 293–298
- Farahmandfar, R., E. Farahmandfar, A. Ramezani, 2009.
Physical properties of rough rice. International Journal
of Food Engineering. 5(5): 1-10
- Firouzi, S., Alizadeh, M.R., Minaei, S. 2010. Effect of the size
of perforated screen and blade-rotor clearance on the
performance of Englebreg rice whitener. African Journal
of Agricultural Research. 5(9): 941-946.
- Hacihafizoglu, O., A. Cihan, K. Kahveci, 2008. Mathematical
modelling of drying of thin layer rough rice. Food and
bioproducts processing. 86: 268–275
- Hashemi Solimani, S.H. 1997. Needs and providing
comprehensive programs in rice milling industries. The
6th symposium of rice of IRAN.
- Hedayatipoor, A., H.A. Arefi, H. Rashidi, 2003. The effect of
drying temperature and final moisture content of paddy
grain on fracture and crack percentage for high-yielding
varieties in Mazandaran province. Final report project.
Rice Research Institute of IRAN.
- Khosh Zamir, A., 1993. Determine the appropriate
temperature for drying rate in the milling process. Final
report project. Rice Research Institute of IRAN.
- Minaee, S., Gh.R. Rohi, M.R. Alizadeh, 2005. Investigation of
the effects of drying parameters on rice cracking and
breakage during milling. Journal of Agricultural
Engineering Research. Vol 6. No 22: 97-112
- Sabori, S. 2002. Drying suitable height of paddy in fixed bed
dryer. Final report project. Rice Research Institute of
IRAN.
- Yadav, B.K., V.K. Jindal, 2008. Changes in head rice yield
and whiteness during of rough rice (Oryza sativa L.).
Journal of Food Engineering. 86: 113-121.