Hierarchical approach for analysing diversity in canopy characterstics of mango
1999
Kumar, Ram | Negi, S.S. | Rajan, S.(Central Institute for Subtropical Horticulture, Lucknow (India))
Light penetration in tree canopies is one of the important factors responsible for good fruit colour and quality. The study was conducted on 26 important Indian mango varieties to examine their foliage density and diffuse non-interceptance, a parameter which indicates how much of sky is visible from beneath the canopy. LAI-2000 was used for the indirect measurement of Leaf Area Index (LAI) and diffuse non-interceptance. The evaluation of genotypes for their canopy characteristics indicate that genotypes differe significantly in foliage density (LAI=1.08-5.58). Diffuse non-interceptance values also exhibited large variation and ranged from 0.02 to 0.4 among the genotypes. The data subjected to hierarchical cluster analysis based on squared Euclidean distance revealed that Bangalora, Fazri, Neelum, Vanraj, Dashehari, Alphonso, Lucknow Safeda and Banganapalli had similarity in canopy structure. Nisar Pasand, Kishan Bhog and Bombay Green had compact and dense canopy with more foliage component. Papatio and Fernandin exhibited comparatively less foliage under Lucknow conditions. Prabhashankar and Chausa showed similarity and were closer to compact canopy group. In general, east Indian and north Indian cultivars recorded more foliage component (LAI), whereas Fernandin, Papatio and Rataul canopies exhibited high diffuse non-interceptance values. The genotypes recording more diffuse non-interceptance produced fruits with better colour. The results indicated that ideotype should not have very high foliage density for proper colour development.
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