Field experiment was conducted at Agricultural Research Station, Perumallapalle during 2008Perumallapalle during -2009Perumallapalle during and 2009Perumallapalle during -2010 to know the effect of levels of nitrogen on yield and quality of early maturing sugarcane varieties. Four varieties viz., 86V96, 93RR44, 99V30 and 2003V46 were tested under four nitrogen levels viz., 75, 100, 125 and 150% recommended dose of nitrogen. The results of the experiment indicated that yield and yield attributing characters were positively influenced by the increased dose of nitrogen than normal recommended dose. Among the varieties, 2003V46 responded both to lower levels and higher levels of nitrogen indicating high nutrient use efficiency of the variety. Where as the variety 99V30 responded to higher doses of nitrogen i.e. 150% recommended dose of nitrogen, requires higher fertilization compared to other varieties. Levels of nitrogen did not affect the quality parameters of juice.

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Adsorption isotherms for whole corn, degermed corn, and germ flours were obtained at 78°F and 122°F and at relative humidities in the range of 11-97%. Various empirical equations for the isotherms were tried and the parameters were calculated for the equations. Brunauer-Emmett-Teller (BET) surface areas of the various inaterials were calculated to describe the sorption phenomenon. The BET surface areas based on water sorption were higher for degermed corn flour than for germ flour. The free energy changes for whole corn, degermed corn, and germ flours were determined and represented by empirical equations.

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Swelling stresses and hydrostatic compressibilities of ground whole corn, endosperm and germ were determined by using the theory of swelling stresses in gels. The ground corn and its constituents were considered as gels. The magnitude of swelling stresses in the ground corn materials was in order of several thousand pounds per square inch at low equilibrium moisture contents, when subjected to increased vapor pressure. The hydrostatic compressibility for ground whole corn, endosperm and germ increased with an increase of moisture content.

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