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A. Adi Prawoto
Indonesian Coffee and Cocoa Research institute
Agriculture, Biological Sciences & Forestry

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Systemic Inducing Resistance on Cocoa Seedling Against Vascular Streak Dieback By Boron and Silikon Application Fitria Yuliasmara; Sri Sukamto; A. Adi Prawoto
Pelita Perkebunan (a Coffee and Cocoa Research Journal) Vol 27 No 3 (2011)
Publisher : Indonesian Coffee and Cocoa Research Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/iccri.jur.pelitaperkebunan.v27i3.157

Abstract

Black pod rot disease (BPRD) which is caused by Phytophthora palmivora is one of the main diseases of cocoa cultivations particularly in plantations with wet climate. Black pod rot can develop rapidly under high humidity environments, particularly during rainy seasons. This disease can cause loss of harvest of up to 46.63% in East Java. The various control efforts attempted so far have not resulted in significant improvements. Urea, in addition to functioning as fertilizer, can also produce the ammonia gas which is believed to be able to suppress black pod rot. This research aims to determine the effectiveness of black pod rot control using the combination of lime and urea. This research was conducted from June to September 2013. The materials used in test included sterile soil, black pod rot infected cocoa, urea, and agricultural lime. Observation results showed that ammonia could form from urea. Lime can increase the speed of the formation. The ammonia gas forming from 0.06% urea and 0.3% lime can control the P. palmivora fungus inside the soil. Key words: Pod rot, P. palmivora, urea, lime, ammonia
Variability of nutrient absorption in several cocoa planting materials A. Adi Prawoto; Soetanto Abdoellah
Pelita Perkebunan (a Coffee and Cocoa Research Journal) Vol 6 No 2 (1990)
Publisher : Indonesian Coffee and Cocoa Research Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/iccri.jur.pelitaperkebunan.v6i2.373

Abstract

A study on nutrient absorption of Trinitario and Forastero cocoa types had been conducted in Kaliwining Experimental Garden and the laboratory of plant analysis of the Jember Research Institute for Estate Crops (JRIEC) since June 1987 until March 1988. Trinitario type was represented by four groups of cultivars i.e.Djati Roenggo (three DR series) Djati Roenggo Clone (13 DRC series), Kaliwining Clone (six KWC series), and Imperial College Selection (three ICS series). Forastero type was represented by two groups of cultivar, i.e. Getas Clone ( seven GC series),and Scavina (three Sea series). The seedlings of propelegitimate seeds were used. The results showed that under the same environmental condition there were significant differences between the two cocoa types in the absorption of K, Mg, Cu, and Mn. Trinitario type showed high absorption for K and Mn, but lower in the absorption of Mg and Cu compared to Forastero type. Among cultivar's group within Trinitario type there were differences in the absorption of N, P, K, Mg, Cu, and Mn. ICS group showed high absorptionfor N, KWC for P and K, DRC for Cu, ICS for Mn, and DR, DRC and ICS for Mg. In the Forastero type, GC group showed high absorption for P, but Sea group had the highest absorption capacity for K, Mg, and Mn. No significant difference was observed between the series within each cultivar group.
Co-Authors Fitria Yuliasmara Soetanto Abdoellah Sri Sukamto