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Anthocyanin synthesis and light utilisation can be enhanced by reflective mulch – visualisation of light penetration into a tree canopy
摘要： With the increasing use of hailnets and decrease in light availability in the ripening period of apple fruit, insufficient light exposure often causes poor colouration viz anthocyanin synthesis on certain parts of the fruit and on certain fruit within the tree. The aim of this study was to investigate the potential of improving anthocyanin synthesis, in terms of fruit colouration, the major incentive for a consumer. Therefore, the reflective ground cover Lumilys? was spread between ‘Braeburn Mariri Red’ apple rows under a crystalline hailnet seven weeks prior to harvest and colour measured on 240 attached apple fruit. The reflective ground cover increased the reflected light by 1.6 to 3.9 times 1.0 m above ground. The improved light utilization led to an improved peel colouration, especially on the shaded side of the apple fruit and fruit in the lower inner part of the canopy, A coloured visualization from orange (high light intensity), yellow (medium) to green (low light intensity) as a result of the individual PAR measurements every 20 cm inside the canopy showed how the reflective mulch influences the light penetration into the different parts of the tree canopy.
关键词： reflective mulch,light reflection,anthocyanin,fruit quality,fruit colour,Apple (Malus domestica Borkh.),LumilysTM,hail net,climate change
更新于2025-09-23 15:19:57
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Differentiation of Deciduous-Calyx and Persistent-Calyx Pears Using NIR Hyperspectral Imaging Analysis
摘要： Korla Fragrant pears are small oval pears characterized by light green skin, crisp texture, and a pleasant aroma after which they are named. The flesh of deciduous-calyx pears is considered more desirable in taste and texture attributes than that of persistent-calyx pears; Chinese packaging standards require that each packed case of highly demanded “superior” class pears contain 5% or less of the persistent-calyx fruits. Near-infrared hyperspectral imaging was investigated as a potential method for automatic sorting of the two types of pears. The hyperspectral images were analyzed, and wavebands at 1190 nm and 1199 nm were selected for differentiating deciduous-calyx fruits from persistent-calyx fruits. A multispectral differentiation algorithm using the ratio of the pears’ relative intensities at 1190 nm and 1199 nm was developed. The results showed that the algorithm correctly classified 89.3% to 94.0% of deciduous-calyx pears and effectively differentiated pears such that the number of persistent-calyx pears misclassified as deciduous-calyx pears comprised only 2.4% to 4.9% of all pears classified as deciduous-calyx pears, performing well within the targeted packaging standards.
关键词： Classification,Korla fragrant pear,Hyperspectral image,Fruit quality
更新于2025-09-04 15:30:14