Rifnas L.M.,*, Vidanapathirana N.P., Silva T.D., Dahanayake N., Subasinghe S., Weerasinghe S.S., Nelka S.A.P. and Madushani W.G.C.
Rifnas, L.M., Vidanapathirana, N.P., Silva, T.D., Dahanayake, N., Subasinghe, S., Weerasinghe, S.S., Nelka, S.A.P. and Madushani, W.G.C., 2023. Development of Cutting Propagation Technique for Ornamental Plant Allamanda cathartica (Rukkathana). Journal of Agro-Technology and Rural Sciences, 3(1), p.28-33.DOI: https://doi.org/10.4038/atrsj.v3i1.49
Publication year: 2023

Allamanda cathartica is an indigenous, widely distributed plant in Sri Lanka and is identified as Rukkathana. It is cultivated for large yellow flowers which have numerous medicinal and ornamental values. The propagation of Allamanda cathartica through conventional cuttings has limitations since the sprouting process is very slow and the success rate is remarkably low. Therefore, with the objective of developing a suitable cutting propagation technique for Allamanda cathartica plants an experiment was carried out in a two factor factorial manner at the University of Colombo Institute for Agro-Technology and Rural Sciences, Hambantota, Sri Lanka. Different types of stem cuttings: hardwood, semi-hardwood, softwood and shoot tips were tested in different potting media of pure sand, pure coir dust and sand and coir dust at the ratio of parts by volume 1:1 under controlled environmental conditions. There were twelve treatment combinations and four replications each containing three units and those were arranged in a Complete Randomized Design manner. Survival, rooting, shoot length, number of roots and root weight were recorded and statistical analysis was done by SAS 9.1.3 package. The study revealed that shoot tips exhibited better survival in a mixture of sand:coir dust and sand only media, as well as in coir dust and a mixture of sand:coir dust for hardwood cuttings. However, the lowest survival was in semi hardwood planted in sand only compared to all other treatments. Shoot tips showed superior rooting and shoot length in pure coir dust and a mixture of sand:coir dust media, while other cuttings showed the lowest rooting when planted in sand only media. The highest root weight was observed in shoot tips planted in sand:coir dust media, followed by shoot tips in pure coir dust, while the lowest root weight was recorded in softwood, semi hardwood, and hardwood planted in sand only, as well as in softwood cuttings planted in sand:coir dust media. The results suggest that the choice of growth media should be based on the type of cutting to improve rooting and growth performance. Higher aeration in growth media was found to be crucial for improving root initiation and stimulating metabolic processes. It can be concluded that, shoot tips planted in sand with coir dust can be recommended for mass multiplication of Allamanda cathartica.