Dynamic yield modeling of Hass avocado under technified irrigation in Peru: effects of age, altitude, and planting density
DOI:
https://doi.org/10.17268/Keywords:
production function, agricultural econometrics, productive efficiency, dynamic analysisAbstract
This study estimated a dynamic production function for Hass avocado (Persea americana Mill.) in Peru using a log-linear econometric model, with the objective of characterizing yield as a function of crop age and incorporating the effects of altitude and planting density under technified irrigation conditions. A total of 34 observations from commercial production systems were used, modeling yield per plant through a cubic polynomial in age and logarithmic transformations of altitude and planting density. The model showed a satisfactory fit (R² = 0.76), appropriate econometric diagnostics, and good predictive performance. The results revealed a sigmoidal yield trajectory with phases of establishment, accelerated growth, and maturity with physiological decline. The biological maximum yield occurred between 15.2 and 15.9 years, whereas the technical optimum was reached between 13.8 and 14.7 years. Planting density reduced individual yield due to intraspecific competition, while altitude increased the production level without modifying the functional form of the curve. It is concluded that crop age determines the temporal trajectory of yield, whereas altitude and planting density modulate the production level.
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