Buletin Agrohorti
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Pertumbuhan Planlet Nenas (Ananas comosusL. Merr.) Varietas Smooth Cayenne Hasil Kultur In Vitro pada Beberapa Konsentrasi BAP dan Umur Plantlet
Full text linkThe aim of this research is to study the effects of synthetic cytokinin (6-benzylaminopurine/BAP) treatments on two groups of pineapple (Ananas comosusL.Merr.) plantlets differentiated by plantlet ages. The research used the Factorial Experiment on Randomized Complete Block Design with two factors, which are BAP concentrations (0 ppm, 25 ppm, 50 ppm, and 75 ppm) and plantlet division by age grouping (52 days and 69 days), with three replications. It was then followed by Tukey’s Honestly Significant Difference Test at error level of 5%. The results show that BAP treatments with the concentration used in this research significantly inhibits the growth of pineapple plantlets observed on four variables (number of leaves, leave length, plantlet height, and plantlet diameter), while age grouping treatments didn’t show any significant effects, except on the plantlet height at 8 and 14 weeks after treatment. There are also treatment-related interactions which significantly affects the number of leaves and plantlet height. It was then suggested that lower concentrations of cytokinin are required if similar research is to be conducted in the future.Keywords : pineapple, post-acclimatization, propagation, 6-benzylaminopurin
Optimasi Dosis Pupuk Anorganik dan Pupuk Kandang Ayam pada Budidaya Tomat Hibrida (Lycopersicon esculentum Mill. L.)
Full text linkThe objective of this research was study the effect of fertilizer and manure on growth and productivity of hybrid tomato(Lycopersicon esculentum Mill. L). This research conduced at Pasir Sarongge experimental field University Farm, Bogor Agricultural University, Cipanas, from February to July 2011. The experimental design used was Completely Randomized Block Design, with two factors and three replications. The first factor was manure dosages which were 0, 10, 20, and 30 ton ha-1. The second factor was fertilizer dosages which were 0%, 75%, and 150% of recommended dosage. Recommended dosage use was 100 kg ha-1 N, 100 kg ha-1 P2O5, and 50 kg ha-1 K2O, from Ministry of Agriculture. Plant height showed quadratic response to manure at 2 and 4 week after transplanted (WAT), then linier at 6 WAT. To the fertilizer, plant height showed no response at 2 WAT and has not shown linier response at 4 and 6 WAT. Interaction between manure and fertilizer was significant at 8 WAT. Manure gave linier effect to number of leaves at 2, 4, and 8 WAT but not significant at 6 WAT. Fertilizer gave no significant effect to number of leaves. Manure gave quadratic effect where as fertilizer gave linier effect to fruit weight per plot, fruit weight per hectare estimated, and relative yield. Optimum manure dose obtained from this research was 24.375 ton ha-1. Maximum fruit weight per plot was 17.41 kg. Estimated maximum fruit weight per hectare was 22.79 ton ha-1. Manure gave linier effect to fruit weight per plot of grade A and B. Fruit weight per plot of grade C, fruit diameter, and average fruit weight were not affected by manure or fertilizer given.Keywords : tomatoes, fertilizer, chicken manure, Lycopersicon esculentu
Aktivitas Herbisida Campuran Bahan Aktif Cyhalofop-Butyl dan Penoxsulam terhadap Beberapa Jenis Gulma Padi Sawah
Full text linkWeed competition becomes a major problem in low land rice. Weeds can reduce rice production up to 60-70%. Mixing herbicides is expected to obtain a broader spectrum of control of the weeds. Inappropriate mixing herbicides may cause antagonism effect which can reduce the effectiveness on the target weed. The objective of the research was to study the antagonism activity of two active ingredients herbicide mixture, cyhalofop-butyl and penoxulam. The treatment was consisted of three types of herbicide with five level of doses, i.e. a single herbicide cyhalofop-butyl (0, 375, 750, 1500, and 3000 g ai ha-1), penoxulam (0, 50, 100, 200, and 400 g ai ha-1), and the mixture of cyhalofop- butyl 50 g L-1+ penoxulam 10 g L-1(0, 225, 450, 900, and 1800 g ai ha-1). The target weeds were Echinochloa cruss-galliand Monochoria vaginalis. Dry weight of biomass and percent of damage would further determine wheather the herbicide mixture were synergistic, antagonistic, or additive. Since cyhalofop-butyl and penoxulam had a different mode of action, analysis of the data used MSM (Multiplicative Survival Model) method to determine the LD50 of each herbicide treatment and mixture component. The result showed that an active ingredient mixture of cyhalofop-butyl 50 g L-1+ penoxulam 10 g L-1 was not antagonist, with LD50-expectation values of 253.231 g ai ha-1and the LD50-treatment of 211.91 g ai ha-1. The co-toxicity value was 1.19 (>1).Key words: rice field weeds, cyhalofop-butyl, penoxulam, herbicide mixture, MSM (Multiplicative Survival Model), LD5
Pertumbuhan dan Perkembangan Cabai Keriting (Capsicum annuum L.) secara In Vitro pada beberapa Konsentrasi BAP dan IAA
Full text linkCurly red pepper (Capsicum annuumL.) is one of the crops that are important and widely cultivated in Indonesia. The purpose of this research was to determine the effect of the use of plant growth regulators BAP and IAA in various doses on the growth and development of curly red peppers in vitro. This research was conducted on March until October 2011 in Tissue Culture Laboratory Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University. This research using Randomized Complete Design with combination of plant growth reguators as the factor. The results showed that combinations of growth regulators significantly influenced root induction, high growth, number of leaves, callus and shoot multiplication. Plant growth regulator combination of 0 mg L-1 BAP + 1 mg L-1 IAA was very good treatment in inducing roots. Combination of 2 mg L-1 BAP + 0.2 mg L-1 IAA effect high growth and shoot induction. Combination of 1 mg L-1 BAP + 0 mgL-1 IAA was the best treatment in increasing number of leaves. While for callus and multiplication, the best treatment was combination of 4 mg L-1 BAP + 0 mg L-1 IAA.Keyword: induction, growth regulators, pepper plan