Pengaruh Waktu dan Frekuensi Aplikasi Pupuk Daun Terhadap Pertumbuhan dan Pembungaan Anggrek Dendrobium ’Tong Chai Gold’

ABSTRACTMost of orchids grow slowly. Low fertilizer concentration with high frequency of fertilization can be the alternative to increase orchids growth. The objective of the research was to evaluate the effect of time and frequency of fertilizer application on Dendrobium ‘Tong Chai Gold’. The experiment was arranged in randomized of completely block design with two factor of treatment. The first factor is time of application and the second one is frequency of application of foliar fertilizer. The time applications in the morning about 6.30 to 7.30 o’clock, at mid day about 11.30 to 12.30 o’clock, and in the afternoon about 16.30 to 17.30 o’clock. The frequency of foliar fertilizer application were every three days or six days. The result of this experiment showed that time and frequency application of foliar fertilizer could not increased number of bulb, but increased young leaf length, and width. Fertilizer was applied in the morning combined with every three days frequency of fertilizer tended to result a better flowering of Dendrobium ‘Tong Chai Gold’.Key words : Dendrobium, fertilizer, application time and frequency, growth, flowering

Pertumbuhan Vegetatif dan Generatif Batang Atas Jeruk Pamelo ‘Nambangan’ pada Empat Jenis Interstok

ABSTRACTThe objective of this research was to study the differences effects of interstock on scion growth, flowering and fruiting of ‘Nambangan’ pummelo (Citrus grandis (L.) Osbeck). The research was conducted from January to December 2005 in a green house of Cikabayan Research Station IPB, Dramaga. Th e research was arranged in randomized completely block design with singe factor i. e. kind of intertock consisted of Flying Dragon, Troyer, Citrumelo, and Rangpur Lime. All interstocks were grafted on Javanche Citroen rootstock. The result showed that the growth, flowering and fruiting of ‘Nambangan’ pummelo was significantly affected by kind of interstock. Citrumelo interstock tended to induce more vegetatif with low generatif growth of ‘Nambangan’ scion. Troyer, Rangpur Lime and Flying Dragon resulted in moderate growth of ‘Nambangan’ scion, however only Flying Dragon induced ‘Nambangan’ scion to produce more flower and fruit as compared with other interstocks. There was no significant different in carbohydrate content in leaves and C/N ratio among scion with four interstock studied.Key words: interstock, Nambangan, pummel o, flowerin