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Leaf area of cut rose varieties at different growth stages when grown in greenhouse conditions at Peradeniya (Mid Country Wet Zone-MCWZ) of Sri Lanka. Vertical bars indicate LSD at p=0.05
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Rose (Rosa hybrida L.) is one of the most popular cut flower species grown under protected culture in the world. However, in Sri Lanka, the commercial cultivation is limited to upcountry region due to low temperature. Even though many rose varieties are grown in relatively warm regions, their growth rates and productivity vary due to the lack of ad...
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... Growth: Rose varieties Black Magic and White Success demonstrated a significantly higher plant growth (p<0.05) in terms of leaf area from the initial growth stages. Varieties Grand Gala and Grand Masterpiece also formed significantly high leaf area (p<0.05) compared to that of Peach Pope (Figure 1). These varietal differences in leaf area may be a result of leaf numbers rather than leaf size, where the varietal difference in leaf number was also statistically significant (p<0.05) and showed the same pattern. Black Magic and White Success formed 22-27 leaves at 12 weeks after first pruning (WAP) while Grand Gala and Grand Masterpiece showed 12- 14 leaves.The shoot numbers of varieties Black Magic and White Success were relatively higher than that of other varieties (i.e. more than three shoots at 12 WAP). Grand Gala also showed similar number of shoot numbers up to 8 WAP but, declined thereafter to shoot mortality (data not shown). Plant height of White Success was significantly lower than that of Black magic and Grand Gala at the end of 12-week growth period (p<0.05). This could be a result of comparatively high shoot formation in this variety. In contrast, the varieties showing lower shoot numbers (i.e. Grand Masterpiece and Peach Pope) were significantly lower (p<0.05) in plant height throughout the growth period (Figure 2), which could be due to inherently low shoot growth rate of these two ...
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... Aluminet shade increased the shoot dry weight for begonia compared with black shade and for celosia compared with black or red shade. Similarly, Rupasinghe et al. (2015) found that aluminet shade increased rose (Rosa hybrida L.) yield more than black shade. Plant height only showed a significant main effect for fountain grass (P < 0.001). ...
The color of horticultural shade nets is known to influence crop growth and quality because of variations in the amount and quality of light. Four ornamental plant species (celosia, begonia, gerbera, and fountain grass) were grown under aluminet, pearl, and red shade nets plus black as the control at 50% shade intensity for 8 weeks. Black had the least transmittance (~10% to 30% of ambient) within the red spectrum (620-750 nm), whereas red had the greatest at~70% to 80%. Aluminet and pearl resulted in a similar reduction in photosynthetic photon flux at~50% to 55% and ~55% to 65% of ambient, respectively. Alu-minet increased the shoot dry weight for begonia and celosia, whereas no differences among shade nets were seen for gerbera or fountain grass. The chlorophyll concentration was greatest under aluminet for each species except begonia. Shade net color did not affect flower number.
Pruning is an inevitable practice in rose cultivation which stimulates the development, flowering and longevity of the cut roses. Optimum pruning height of rose var. 'White Success' was not identified yet. Thus, the present experiment was performed to estimate the consequences of diverse pruning heights on growth and flower production of rose var. 'White Success' at the Regional Agricultural Research and Development Centre, Bandarawela, Sri Lanka from January to April 2019. The experiment was arranged according to randomized complete block design with four replications. One-year-old budded rose plants were hard pruned at 15 cm from the ground level before the commencement of the experiment and allowed to grow for a period of one month. Eight treatments were defined based on different pruning heights. Analysis of variance was performed to decide the treatment effects on measurements. Results revealed that pruning was positively influenced the growth and flowering of roses than non-pruned plants. The highest performances in measured parameters were observed in pruning shoots from 15 cm above the bud union. According to the results of the present study, it could be concluded that growth and the flowering of roses could be increased by pruning practices. Pruning of new stems at 15 cm above the bud union is the best method to get higher production of quality flowers from "White success".
In recent years, the demand for herbs and aromatic products has increased worldwide in the herbal, flavor, and fragrance industry. Studies suggest that rapidly increasing anthropogenic activities have put a lot of pressure on energy and water use, especially in the dry land areas. To meet the burgeoning demand of medicinal and aromatic plants (MAPs), long-term use of agrochemicals and poor farming techniques reduced the quality of produce as per industrialist grade and can cause public health challenges and environmental pollution. Sustainable crops, higher productivity, and quality are typically assured by microclimate modification, which in turn contributes to sustainability and livelihood generation for people. Modification of climatic conditions in a relatively small area, at a height of 3–6 m over the surface of the earth, affect the growth and development of plants by altering different physical parameters such as light intensity and wavelength. Morphology, growth, yield, and secondary metabolites production in MAPs are affected by microclimate modification. These parameters influence plant photosynthesis which plays an important role in plant vegetative, reproductive, and developmental stages, yield, and secondary metabolite accumulation. Different crops behave differently to microclimate modifications. In some crops, shade levels significantly reduce the yield and quality of seed, while in some others, higher amount of light is required to enhance productivity and quality. Therefore, it is indispensable to evaluate the threshold light intensity to ensure the sustainable production of MAPs. This study provides an understanding of plant acclimation to light intensity from the vegetative phase to the reproductive phase of the MAPs. So, from the current study we have concluded that in the climate change era and as per the need of the herbs, aromatic products and perfumery industry, substitution of synthetic fertilizers and poor agronomic techniques with microclimate modification can be considered to enhance the quality of products. This technique can be recommended to industrialist and farmers as sustainable culture techniques by eliminating the additional need of chemical fertilizers, however, more studies are required to fill the information gaps with morphology, physiology, quality and soil properties of MAPs in different light conditions along with other agronomic techniques.
