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The application of production function analysis for the estimation of fertilizer requirements of wheat in northern New South Wales



The application of production function analysis for the estimation of fertilizer requirements of wheat in northern New South Wales



Australian J Exp Agr Anim Husb 6(23): 418-424



A procedure for the statistical analysis and the interpretation of factorial type field experiments for the assessment of fertilizer requirements is described and demonstrated using data from 49 field experiments in northern New South Wales. Yield data for each site are represented by the mathematical model: Y= b0 +b1N+b1N0.5+b3P+b4P0.5 + b5NP + b6(NP)0.5 +b7REP where N and P are nitrogen and phosphorus fertilizer rates respectively and REP = replicate. This model is used to solve the simultaneous N and P fertilizer requirements, using computer techniques. The data indicate widespread deficiencies of N and P, but, in general, only application of P fertilizer can be justified at present prices. The development of more efficient procedures for applying N fertilizers or the reduction in their cost could lead to greater requirements for N fertilizers. The severity of the widespread N deficiency is, in general, not sufficient to seriously affect the estimation of P fertilizer requirements for the majority of sites.

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