This paper describes an approach to estimate the
photosynthetic capacity and derive the optimum fruit number for
each individual tree, in order to achieve a defined fruit size, which
is named as the fruit bearing capacity of the tree. The estimation
of fruit bearing capacity was carried out considering the total
leaf area per tree as measured with a 2-D LiDAR laser scanner,
LALiDAR, and key carbon-related variables of the trees including
leaf gas exchange, fruit growth and respiration, in two commercial
apple orchards. The range between minLALiDAR and maxLALiDAR
was found to be 2.4 m² on Pinova and 4.3 m² on RoHo 3615 at
fully developed canopy. The daily C requirement of the growing
fruit and the associated leaf area demand, necessary to meet the
average daily fruit C requirements showed seasonal variation,
with maximum values in the middle of the growing period. The
estimated fruit bearing capacity ranged from 33-95 fruit tree-1 and
45-121 fruit tree-1 on the trees of Pinova and RoHo 3615, respectively.
This finding demonstrates sub-optimal crop load at harvest
time in both orchards, above or below the fruit bearing capacity
for individual trees. In conclusion, the LiDAR measurements of
the leaf area combined with a carbon balance model allows for the
estimation of fruit bearing capacity for individual trees for precise
crop load management.
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