Economic Analysis of Integrated Crop Management Practices of `Navel' Oranges

in Journal of the American Society for Horticultural Science
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  • 1 Soil and Environmental Sciences Department, University of California, Riverside, CA 92521
  • 2 Plant Pathology Department, University of California, Riverside, CA 92521
  • 3 Lindcove Research and Extension Center, 22963 Carson Ave., Exeter, CA 9321 1
  • 4 Soil and Environmental Sciences Department, University of California, Riverside, CA 92521
  • 5 Botany and Plant Sciences Department, University of California, Riverside, CA 92521
  • 6 Botany and Plant Sciences Department, University of California, Riverside, CA 92521
  • 7 Entomology Department, University of California, Riverside, CA 92521
  • 8 Lindcove Research and Extension Center, 22943 Carson Ave., Exeter, CA 93211
  • 9 Statistics Department, University of California, Riverside, CA 92521

The effect of various integrated crop management practices on productivity (fruit yield, grade, and sire) and returns of `Washington Navel' oranges [Citrus sinensis (L.) Osbeck] was determined in the San Joaquin Valley of California. Seventy-two combinations of treatments comprised of three irrigation levels [80%, 100%, and 120% evapotranspiration demand (ETc)], three N fertilizer levels (low, medium, and high based on 2.3%, 2.5%, and 2.7% leaf N, respectively), gibberellic acid (±), miticide (±), and fungicide-nematicide (±) were included in the analysis. Using a partial budgeting procedure, returns after costs were calculated for each treatment combiition. Costs of treatments, harvesting, packing, and processing were subtracted from the value of the crop. The value of the crop was calculated as the sum of returns of crop in each size and grade category. The overall result indicated that returns after costs were higher for the +fungicide-nematicide treatment and also were generally more with increased irrigation. The combination of 120% ETc, +fungicide-nematicide, medium or high N, -miticide, and -gibberellin showed the highest return of all treatment combinations. Second highest returns were obtained with high N or with miticide and gibberellin used together.

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