In-Orchard Sizing of Mango Fruit: 2. Forward Estimation of Size at Harvest

Forecast of tree fruit yield requires prediction harvest time size as well number. Mango (Mangifera indica L.) mass can be estimated from correlation to measurements length (L), width (W) and thickness (T). On-tree individually tagged were undertaken using callipers at weekly intervals until the past commercial maturity, judged growing degree days (GDD), for mango cultivars ‘Honey Gold’, ‘Calypso’ ‘Keitt’ four locations in Australia Brazil during 2020/21 21/22 production seasons. Across all cultivars, linear LWT was characterized by a R2 0.99, RMSE 29.9 g slope 0.5472 g/cm3, while L((W+T)2)2, mimicking what measured machine vision on tree, 0.97, 25.0 0.5439 g/cm3. A procedure established based made five or three weeks prior (approx. 514 422 GDD, before harvest, respectively). Linear regression models increase lineal an > 0.88 populations, with average (rate increase) 19.6 ± 7.1 g/week, depending cultivar, season site. The mean absolute percentage error predicted compared harvested weight estimates earlier later 16.3 1.3% 4.5 2.4%, respectively. Measurement interval allowed better accuracy tray distribution. recommendation forecast in-field approximately 400 450 GDD units one week later.