| چکیده انگلیسی مقاله |
Determination of physical properties of agricultural products is very important for optimization design of processing, planting and harvesting machines. Physical properties affect on the losses reducing and quality protection of products at going through of postharvesting process. At this study, the effect of grain moisture content on some physical properties of two varieties paddy grains (Sephidrod and Binam) was investigated. These properties included length, width, thickness, geometrical diameter, mathematical diameter, sphericity, thousand seed weight, bulk density, true volume and true density. The levels of grain moisture content were 10, 14, 18, 22% (w.b.). The results showed that with increasing of grain moisture contain, geometrical diameter, mathematical diameter, area, volume, thousand seed weight, bulk density and true density were increased significantly (p< 1%). But true density was decreased. Also Sphericity no verified significantly. .0pt;fC� fm � s New Roman","serif"; mso-bidi-font-family:"B Yagut"'> w.b.22 درصد بودند. نتایج نشان داد که با افزایش محتوای رطوبت محصول ابعاد اصلی، قطرهندسی، قطرحسابی، سطح و حجم دانهها، وزن هزاردانه، چگالی ظاهری و چگالی واقعی به طور معنیداری افزایش مییابد در حالی که حجم واقعی کاهش مییابد. اثر محتوای رطوبت دانه بر ضریب کرویت معنیدار نبوده است. �راس�e � � � و کاهش تبخیر. 12-10 اسفند. دانشگاه شهید باهنر کرمان. صفحههای 141 تا 152. Doorenbos J and Kassam AH, 1979. Yield response to water. FAO Irrigation and Drainage Paper, No 33. English MJ, 1990. Deficit Irrigation. I : Analytical framework .J Irrig and Drain Eng ASCE. 11(3): 344- 411. Howell TA, Davis KR, McCormick RL, Yamada H, WalhoodVT and Meek DW, 1984. Water use efficiency of narrow row cotton. Irrig Sci 5: 195-214. Huang M, Callich J and Zhong L, 2004. Water-yield relationships and optimal water management for winter wheat in the Loes Plateau of China. Irrig Sci 23: 47-54. Kipkorir KK, Reas D and Massawe B, 2002. Seasonal water production functions and yield response factors for maize and onion in Perkerra, Kenya. Agric Water Manage 56: 229-240. Liu WZ, Hansaker DJ, Li YS, Xie XQ and Wall GW, 2002. Interrelations of yield, evapotranspiration and water use efficiency from marginal analysis of water production functions. Agric Water Manage 56: 143-151. Necdet D, Yılmaz E, Sezgin F and Gürbüz T, 2006. Water-yield relation and water use efficiency of cotton (Gossypium hirsutum L.) and second crop corn (Zea mays L.) in western Turkey. Agric Water Manag 82: 63-85. Norwood CA, 2000. Water use and yield of limited-irrigation and dryland corn. Soil Sci Society America J 64: 364-370. Orgaz F, Mateas L and Fereres E, 1992. Season length and cultivar determine the optimum evapotranspiration deficit in cotton. Agron J 65: 464-467. Radin JW, Reaves LL, Mauney JR and French OF, 1992. Yield enhancement in cotton by frequent irrigation during fruiting. Agron J 84: 551–557. Stone JF, Reaves HE and Garton JE, 1982. Irrigation water conservation using wide- spaced furrows. Soil Sci 43: 402- 411. Wanjura DF, Upcharch DR, Mahan JR and Burke JJ, 2002. Cotton yield and applied water relationships under drip irrigation. Agric Water Manage 55: 217-237. |