ECONOMIC ANALYSIS OF THE RESPONSE OF BROAD BEANS TO LEVELS OF N AND P FRTILIZERS

A. Najm, Mahmoud

	ECONOMIC ANALYSIS OF THE RESPONSE OF BROAD BEANS TO LEVELS OF N AND P FRTILIZERS
The Iraqi Journal of Agricultural Science
Article 1, Volume 41, Issue 5, 2010, Pages 125-132
Author
Mahmoud A. Najm
Abstract
This study aimed estimating the optimum amount of nitrogen and phosphorus fertilizers for broad beans production in economic condition similar to experiment region, four functions were estimated : Linear , Cobb – Douglas , quadratic and square root . the results showed that the quadratic function was the most representative according to statistically economical , econometrical and biological criteria. The coefficient of determination was 90% . The results also showed the absence of autocorrelation from the model as Durban – Watson value was less than (dU) and more (dL) the results showed the absence of heteroscedasticity according to the Park test . we alsofound the absence of multicallinearity according to correlation matrix for independent variables. The results had shown that the optimum amount of nitrogen fertilizer was (56.3) kgs/Donum. While the optimum amount of phosphorus was (46.9) kgs/Donum. In addition some derivatives from production function were derived such as marginal rate of substitution , isoquant equation , expansion path , isoclines , and ridge lines. The results also showed that the signs of independent varieties were consistent with economic logic. The nature of the quadratic function is consistent with biological criteria as the addition of fertilizer would be biologically acceptable a certain limit.

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