A Case Study on Crop Load Adjustment of Open Cultivated Grapevine Based on Horizontally Projected Leaf Area Index

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  • Shiraishi Mikio
    Grape and Persimmon Research Station, National Institute of Fruit Tree Science
  • Hayashi Hidenori
    Yoshinokawa Center for the Dissemination of Improved Agricultural Methods
  • Ueno Toshihito
    Grape and Persimmon Research Station, National Institute of Fruit Tree Science

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  • 葉影率から推定したLAIに基づく露地栽培ブドウの着果量調節事例

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We developed a rapid method for crop load adjustment on the basis of the leaf area index (LAI) from a case study of 18 open cultivated table grape cultivars for two successive years. Quadratic regression was significant at p < 0.01 for the relationship between horizontally projected LAI (PLAI) and LAI for 40 to 50 days after full bloom, resulting in the rapid estimation of LAI by the measurement of PLAI. Parameters of LAI per canopy area, canopy area, presumed bunch weight and crop load per leaf area (red-skinned cultivar, 0.6 to 0.8 kg·m−2 < black- and violet-skinned cultivar, 0.8 to 0.9 kg·m−2 < white-skinned cultivar, 1.0 to 1.1 kg·m−2) were used and formulated to estimate crop load per canopy area. All cultivars showed higher market preferences by crop loading on the basis of LAI from the field trial.<br>

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