EFFECT OF SPACING AND SOIL pH REGULANTS ON GROWTH AND FLOWERING OF HYDRANGEA (Hydrangea macrophylla Thunb.) CUT FLOWER UNDER PROTECTED CULTIVATION

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Date
2023-11-15
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College of Horticulture, Mudigere, Keladi Shivappa Nayaka University of Agricultural and Horticultural Sciences, Shivamogga
Abstract
The present investigation entitled “Effect of Spacing and Soil pH Regulants on Growth and Flowering of Hydrangea (Hydrangea macrophylla Thunb.) Cut Flower under Protected Cultivation’’ was conducted in the Naturally Ventilated Polyhouse at College of Horticulture, Mudigere during the year 2022-23. The experiment was laid out in Randomized Complete Block Design (RCBD) comprising of five treatments with four replications. Results revealed that growth, flowering, cut flower quality and yield were significantly influenced by different levels of spacing. Planting at spacing of 45 × 60 cm recorded the maximum plant spread North – South (81.29 cm), stem girth (4.37 cm) and minimum days to flower bud opening (270.33). Whereas, the plants spaced at 45 × 45 cm apart recorded the maximum plant height (102.41 cm), leaf length (22.49 cm), number of leaves (58.12), diameter of inflorescence (25.66 cm), stalk length (115.41 cm), vase life (20.22 days), number of cut flower stems per plant (4.11), gross returns (₹ 34,52,400) with highest B:C ratio of 5.63. Hence, planting at 45 × 45 cm spacing is ideal for commercial cultivation of hydrangea for cut flower purpose. Further, among seven different soil pH regulants, application of Aluminium sulphate @ 120 g/ m2 intensified to true blue colour (Purple violet group N82 - Strong purple A) from initial light pink colour as observed in RHS colour chart, maximum anthocyanin content (delphinidin) (714.87 mg/ 100 g of fresh sepal) in combination with acidic soil pH (4.23), sepal pH (4.12), vase life (26.25 days), flower colour intensity (4.73), flower colour suitability (2.66), appearance of flower (4.51) and overall acceptability (4.80) with highest B:C ratio of 5.89. Hence, this is promising soil pH regulant for best colour intensification of hydrangea.
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