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Kishore Kundan,Singh H. S.,Nath Vishal,Baig M. J.,Murthy D. Sreenivasa,Acharya G. C.,Behera Suchitra 한국원예학회 2023 Horticulture, Environment, and Biotechnology Vol.64 No.4
Canopy architecture is one of the most critical components infl uencing photoassimilation, yield and quality of fruit crops; thus, it is logical to optimize suitable canopy form with high light interception effi ciency. In this study, the eff ectiveness of three forms of canopy architecture viz., open centre, Y trellis and espalier were assessed, under high density planting system of mango (833 plants ha − 1 ). Y trellis facilitated better availability of photosynthetic photon fl ux density (PPFD) in upper (793 μmol m − 2 s − 1 ) and lower canopy layers (487 μmol m − 2 s − 1 ) by exhibiting moderate interception of photosynthetic active radiation (PAR). Y-trellis also manifested relatively higher photosynthetic activity (6.07 μmol CO 2 m − 2 s − 1 and 5.24 μmol CO 2 m − 2 s − 1 ), stomatal conductance (0.194 μmol H 2 O m − 2 s − 1 and 0.172 μmol H 2 O m − 2 s − 1 ), carbohydrate and protein content in upper and lower canopy layers. On the other hand, espalier system demonstrated high rate of PAR interception and low photosynthetic activity. Mango canopy with Y-trellis and open centre forms provided better results in terms of fl owering intensity and fruit yield. Fruits from Y-trellis exhibited relatively better colour attributes, sucrose and β-carotene content. Alternatively, soluble solid contents, citric acid, carbohydrate and protein content were unaff ected with the training systems. It was evident from PCA biplots that Y-trellis had close proximity with light intensity, photosynthetic characteristics, fl owering intensity, yield, and fruit quality attributes. Moreover, path coeffi cient analysis indicated that PPFD, iPAR and photosynthetic rate ( Pn ) were the most important predictors for determining fl owering in mango. The fi ndings of the present study demonstrate that optimized canopy architecture is instrumental for eff ective utilization of radiation energy for higher fl owering intensity, yield and fruit quality in mango. Economic assessment of training system indicated that Y-trellis was more feasible system when cultivation was aimed to maximise the profi t with no restriction on investment. However under capital constraint situation open centre system was more profi table.