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Achmad Achmad
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Journal : Jurnal Silvikultur Tropika (JST)

 1 
Kuantitas dan Kualitas Kecambah Sengon pada Beberapa Tingkat Viabilitas Benih dan Inokulasi Rhizoctonia sp. Achmad Achmad; Sri Suharyati Vityaningsih; Eny Widajati
Jurnal Silvikultur Tropika Vol. 3 No. 1 (2012): Jurnal Silvikultur Tropika
Publisher : Departemen Silvikultur, Fakultas Kehutanan dan Lingkungan, Institut Pertanian Bogor (IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/j-siltrop.3.1.%p

Abstract

Quantity and Quality of Sengon Sprouts at Some Levels of Seed Viability and Rhizoctonia sp. InoculationThe purpose of this research was to evaluate the quantity and quality of sengon sprouts with several levels of  seed viability and inoculation of Rhizoctonia sp. Materials used was three lots of sengon seed with different levels of viability obtained from Forest Management Unit Pare - Kediri and  Rhizoctonia sp. isolate cultured on PDA media. The treatments tested were 3 levels of seed viability  and 4 levels of Rhizoctonia sp. inoculum. The results showed that seeds with higher viability levels (seed germination = SG 87 and 83 %) produce more sprouts, indicated by the germination percentage which was significantly higher than that of  seeds with lower viability. Rhizoctonia sp. inoculation decreased the number of sprouts, indicated by the germination percentage which was significantly lower. The attacked of Rhizoctonia sp. on sengon sprouts was not associated with the level of seed viability, the lowest inoculum levels (3 corkborer 10-1 ml media) caused high percentage of seedlings death (57%) even  at the seed with high level of viability (SG 87%). The quality of the sprouts were not influenced by the level of seed viability, indicated by the length of roots and hyphocotil of normal sprouts which was not significantly different of sprouts from the seed with higher viability level (SG 87%, root length  2,71 cm, hypocotile length 3,00 cm) than that of the seed with lower viability level (SG 56%, root length  2,38 cm, hypocotile length 2,66 cm).
Mekanisme Serangan Patogen Lodoh pada Semai Pinus (Pinus merkusii) Achmad Achmad; S. Hadi; S. Harran; E. Gumbira Sa'id; B. Satiawiharja; M. Kosim Kardin
Jurnal Silvikultur Tropika Vol. 3 No. 1 (2012): Jurnal Silvikultur Tropika
Publisher : Departemen Silvikultur, Fakultas Kehutanan dan Lingkungan, Institut Pertanian Bogor (IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/j-siltrop.3.1.%p

Abstract

Attack Mechanism of Damping-off Pathogens of Pinus merkusii SeedlingThe study aims to determine the attack period of damping-off pathogen, i.e.  F. oxysporum and  R. solani, on  P. merkusii, as well as studying the role of cellulolytic and pectolitic enzymes in the attack mechanism of both damping-off  pathogens. Attack period determined by inoculated the two pathogenic fungi to seed or some age level of  P. merkusii seedlings. Cellulolytic enzyme activity, represented by cellulase-C1, was determined by spectrophotometric techniques. Pectolitik enzyme activity, represented by polygalacturonase, determined by iodometric techniques and growth of the two pathogenic fungi in the medium containing pectin. The results showed that the attack period of damping-off pathogen, i.e. F. oxysporum and R. Solani, on P. merkusii seedling started from seed to 7-week old seedling, the 8-week old seedlings were free from damping-off. Both pathogens showed cellulase-C1 activity, and the enzyme activity in F. oxysporum is higher than that in  R. solani. Iodometric technique could not detect the polygalacturonase activity of two fungal pathogens, presumably because  P. merkusii stem seedling substrate  which used in testing was too few. Nevertheless the two pathogenic fungi grew more intensively in medium containing pectin shown by higher mycelial dry weight than in media without pectin, and it shows the that the fungi capable to degrade pectin using pectolytic enzymes and use the carbon produced for growth.
Liquid Organic Fertilizer Influence on Jabon (Anthocephalus cadamba miq.) Seedling Growth and Its Resistance to Disease Elis Nina Herliyana; Achmad Achmad; Ardiansyah Putra
Jurnal Silvikultur Tropika Vol. 3 No. 3 (2012): Jurnal Silvikultur Tropika
Publisher : Departemen Silvikultur, Fakultas Kehutanan dan Lingkungan, Institut Pertanian Bogor (IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/j-siltrop.3.3.%p

Abstract

Wood stock from natural forest tends to decrease and increasing of marginal land, it requires an forest development, HTI (Plantation Forest) or community forest to remain able to fulfill wood commodity demand that is increasing. The tree that is very prospective is Jabon (Anthocephalus cadamba miq.). Jabon include fast growing species and can growth in many soil types. Market prospect of the fertilizer is quite high with easy and was known silviculture technology. Use of un-organic fertilizer tends to damage the soil. It can be on structure or soil fertility. The use of liquid organic fertilizer is a solution. The aim of this research is to examine a liquid organic fertilizer application in development of jabon seedling growth in the nursery and to see the resistance of jabon seedling to disease attacks in nursery. Data collecting is done with Complete Random Design (RAL). Data is analyzed with software SAS 9.1. Liquid organic fertilizer BioHara-Plus with dosage 10 ml/plant was the best than other dosage treatments and manure fertilizer and control.  This value showed high added (13,38 Cm) and diameter added (2,94 Cm). And the use of liquid organic fertilizer with dosage 10 ml/plant was optimal in jabon- seedling’s resistance to disease.
Co-Authors Ardiansyah Putra B. Satiawiharja E. Gumbira Sa'id Elis Nina Herliyana Eny Widajati M. Kosim Kardin S. Hadi S. Harran Sri Suharyati Vityaningsih