1. KAUTIR (Kerala Agricultural University Theses Information and Retrieval)
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Item Shade requirments for cut foliage plants (Dracaena Spp.)(Department of floriculture and landscaping, college of agriculture , Vellayani, 2023-12-06) Josmi John; Priya Kumari, IThe thesis work entitled “Shade requirement for cut foliage plants (Dracaena spp.)” was carried out in the Department of Floriculture & Landscaping, College of Agriculture, Vellayani from April 2022 to October 2022. The objective of the study was to evaluate different shade levels and colored shade nets for improving production and quality of commercially important cut foliages, Dracaena fragrans (L.) Ker Gawl., Dracaena reflexa Lam. and Dracaena sanderiana Sander ex Mast. The experiment was laid out in split plot design. The first experiment is conducted to study the effect of different shade levels. Main plot treatments were three different shade levels 50 % shade, 75 % shade and control (shade under coconut garden) and sub plot treatments were three commercially important cut foliage plants Dracaena spp. (Dracaena sanderiana ‘Gold’, Dracaena reflexa ‘Variegata’ and Dracaena fragrans ‘Massengeana’). There was a reduction of temperature under shade nets. Relative humidity was also lower under net houses compared to control condition. Light intensity under different shade levels was lower than outside environment. Different shade levels and colored shade nets had significant effect on production and quality of cut foliage Dracaena spp. Experiment on effect of shade levels revealed that higher shoot and root weight was observed under 75% shade level. Among the varieties highest shoot and root weight was observed for Dracaena sanderiana ‘Gold’ and Dracaena fragrans ‘Massengeana’ respectively. Among the interaction effect Dracaena fragrans ‘Massengeana’ under 75% shade net recorded higher shoot and root weight. Chlorophyll content was found to be higher under 50% shade level, Dracaena sanderiana ‘Gold’ recorded the highest value and their treatment combination also recorded higher values. Plants grown under 75% shade level recorded the highest plant height and leaf number; at 2 MAP it was on par with 50% shade level. Among the varieties highest plant height and leaf number was observed for Dracaena sanderiana ‘Gold’ and Dracaena reflexa ‘Variegata’ respectively. Highest leaf area was observed under 75% shade level at 4 and 6 MAP. 119 Among the varieties Dracaena fragrans ‘Massengeana’ recorded highest leaf area. Highest shoot length was recorded under 75% shade level at 4 and 6 MAP. Dracaena sanderiana ‘Gold’ recorded highest shoot length. The vase life of foliages was found to be superior under 50% shade level and Dracaena sanderiana ‘Gold’ recorded maximum vase life. Experiment on effect of shade net color revealed that higher shoot and root weight was observed under red shade net. Dracaena sanderiana ‘Gold’ recorded maximum shoot and root weight. Their treatment combination also gave higher value. Highest plant height was recorded under red shade net and at 4MAP it was on par with green shade net (50%). Dracaena sanderiana ‘Gold’ recorded maximum plant height and among the interaction effect for Dracaena sanderiana ‘Gold’ under red shade net recorded maximum plant height. Leaf number was maximum under red shade net and Dracaena reflexa ‘Variegata’recorded maximum leaf number and their treatment combination was also higher. Highest leaf area was observed under green shade net and at 4MAP it was on par with red shade net. Among the varieties Dracaena fragrans ‘Massengeana’ recorded highest leaf area. Shoot length was highest under red shade net and variety Dracaena sanderiana ‘Gold’ recorded maximum 37superior under black shade net and it was on par with green shade net. Dracaena fragrans ‘Massengeana’ recorded maximum vase life. Among the interaction effect Dracaena fragrans ‘Massengeana’ under black shade net had recorded maximum vase life. Shade net of 75% was found to be superior in improving most of the plant growth parameters like shoot weight (162.50g) , root weight (35.02g) , plant height (73.25 cm), leaf number (40), leaf area(143.50cm2) and shoot length (53.66 cm) for Dracaena sanderiana ‘Gold’, Dracaena reflexa ‘Variegata’, and Dracaena fragrans ‘Massengeana’ compared to 50% shade level and shade under coconut garden. Vase life (29.16 days) was recorded maximum under 50% shade level compared to 75% shade level and shade under coconut garden. 120 Red colored shade net was found to be superior in improving most of the plant growth parameters like shoot weight (131.21g) , root weight(29.63g) , plant height (77.11), leaf number(41), and shoot length(61.33) for Dracaena sanderiana ‘Gold’, Dracaena reflexa ‘Variegata’, and Dracaena fragrans ‘Massengeana’ compared to green , black , white and shade under coconut garden. Vase life (29.11 days) was recorded maximum under black and green shade nets compared to red, white and shade under coconut garden.