Determination of Water-Salt optimal production functions for yield qulitative components of Varamin and Khordad cultivars

In order to determine the best water - salt - the quality parameters (fiber length uniformity, fiber, fiber tension, fiber strength, fineness of fiber, protein and oil content of seed cotton) in Varamin and Khordad Cultivars of Cotton research project examines the impact of salinity and water levels irrigation on yield and yield components and quality of two varieties of cotton were conducted in Birjand climate. It forms a simple linear function, Cobb-Douglas, quadratic and transcendental were used. First results tables and statistics functions F coefficients showed that all functions mentioned above and were able to estimate the parameters of the fiber length and uniformity, have. The coefficients of the regression lines are plotted equations and graphs contained in the Student t-statistic regression line between the measured and predicted values ​​confirmed this. So the next step was to rank and identify the best among them. The purpose of the five statistical parameters Root Mean Square Error (RMSE), Coefficient of Determination (CD), modeling efficiency (EF), the maximum error (ME) and coefficient of residual (CRM) was used. The results showed that the parameters of both cultivars Khordad and Varamin cotton fiber length and uniformity, can function as a quadratic function is superior to the other functions in the present climate of Birjand. The results showed that none of the functions could not reasonably estimate the parameters of the fiber tension, fiber strength, fiber fineness, cotton seed protein and oil content have been ignored and that's why the ratings. Resulte showed that both cultivars of Varamin and Khordad parameters for fiber length uniformity, quadratic function can be expressed as function of the regional climate Birjand superior to other functions will be presented.