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Abstract
The present investigation deals with the nature of variation of yield corresponding to different levels of energy input in land preparation in the case of transplanted rice. The data recorded for the response of rice yield are compatible with the exponential law of diminishing returns. Use is made of the modified Gauss-Newton algorithm to compute the least square estimates of the parameters associated with the response curve. An attempt is also made to construct 95% confidence intervals for the parameters involved. Achievement of moderate reduction in commercial energy expenditure in land preparation with a very small reduction in rice yield, is suggested by the asymptotic nature of the response curve.
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