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INDONESIA
AGRITROP
Published by Universitas Udayana
ISSN : -     EISSN : -     DOI : -
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
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Articles 6 Documents
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Search results for , issue "Vol. 26, No. 4 Desember 2007" : 6 Documents clear
Induksi Pertumbuhan Eksplan Endosperm Ulin dengan IAA dan Kinetine -, HIDAYAT
AGRITROP Vol. 26, No. 4 Desember 2007
Publisher : AGRITROP

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Abstract

The aims of this research for examining the effect of concentrations of Indole Acetic Acid (IAA) and Kinetine onthe growth of ulin. The research using Murashige and Skoog medium was conducted in Biotechnology Laboratoryof Agriculture Faculty, Tanjungpura University from June 2003 to May 2004. All treatments were arranged inrandomized complete design with ten treatments and four replications. The variable of this research was scoring oncallusformation, time of callusformation (days) and number of callus. The result showed that (5.0 ppm IAA + 6.0ppm Kinetine) and (6.0 ppm IAA + 5.0 ppm Kinetine) were better concentration combination for callus induction.The better for time of callusformation and numbers of callus were 5.0 ppm IAA + 6.0 ppm Kinetine.
Peranan Sucrose Phosphate Synthase (SPS) dan Acid Invertase (AI) Internoda Tebu (Saccharum officinarum L.) dalam Akumulasi Sukrosa -, MISWAR; SUGIHARTO, BAMBANG; HANDOYO, TRI; AYU MADE, SRI
AGRITROP Vol. 26, No. 4 Desember 2007
Publisher : AGRITROP

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Abstract

Sucrose content is an important component of yield in sugarcane (Saccharum officinarum L.) juice and itssynthesis is determines by the activity of Sucrose phosphate synthase (SPS; EC. 2.4.1.14). This enzyme catalyzes thepenultimate reaction of the formation of sucrose from fructose-6-phosphate (F6P) and uridine-5-diphospho glucose(UDPG). Sucrose is synthesized on leaf and translocated into stalk at where it is accumulated to be accumulatedit. In contrast to SPS, acid invertase (AI) is an enzyme that hydrolyze sucrose to glucose and fructose. The abilityof sugarcane to accumulate the sucrose in stalk is determined by the differences between SPS and AI activities.This study was aimed know role of the internodes SPS and AI in sucrose accumulation in the internodes of somesugarcane varieties. SPS, AI and sucrose were extracted from internodes 1, 3 and 5 of 9 month old sugarcane. Theresults showed that sucrose content for all varieties increased concomitant with the rise in the age of internodes.The decrease in AI activity in internode caused the increase in sucrose content in internodes. Meanwhile, highersucrose content in the older internodes was not followed by higher in SPS activity. Generally, there was strongnegative correlation between sucrose content of internodes with SPS and AI activity. In conclusion, the ability ofsugarcane to accumulate sucrose at internodes was primary determined by AI activity, while SPS activity had asmall role on sucrose accumulation at internodes.
Penularan Penyakit CVPD (Citrus Vein Phloem Degeneration) oleh Diaphorina citri Kuwayama (Homoptera: Psyllidae) pada Tanaman Jeruk Siam WIJAYA, I NYOMAN
AGRITROP Vol. 26, No. 4 Desember 2007
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Abstract

The desperation rate of CVPD disease on the central of citrus area in Bali were 32% per year, however thepopulations of D. citri as vector were relative low, so that the research concerning on the minimum population ofD. citri that effective as vector were needed. The aims of this research were to know the minimum population ofD. citri to transmit CVPD effectively, incubation periods of disease on citrus siam variety and the characteristicof pathogen on the vector. The research was carried out in the glass house of Department Plant Pest and Disease,Faculty of Agriculture Udayana University. The result showed that transmission of CVPD disease could be infectedby one imago of D. citri, through the increase of vector population decreased the infection period of CVPD diseased.Liberobacter asiaticum as the pathogen of CVPD had ability to persistent on the vector.
Pengaruh Pemberian Beberapa Dosis Pupuk (N, P, K ) dan Jenis Pupuk Alternatif terhadap Hasil Tanaman Padi (Oryza sativa L.) dan Kadar N, P, K Inceptisol Selemadeg, Tabanan KASNIARI, D.N.; SUPADMA, A.A.NYOMAN
AGRITROP Vol. 26, No. 4 Desember 2007
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Abstract

A pot experiments was conducted in September 2000 until January 2001 at Experimental Station of Faculty ofAgriculture, Udayana University. The experiment was arranged in Completely Randomized Design with treatmentsallocation in factorial with three replications. The treatments were : the first factors consisted of four rates of N,P,Kfertilizers: F1 = 300 kg Urea, 75 kg SP.36, 50 kg KCl ha-1 (1.2 g Urea, 0.3 g SP.36, 0.2 g KCl pot-1) ; F2 = 250 kgUrea, 50 kg SP.36, 25 kg KCl ha-1 (1.0 g Urea, 0.2 g SP.36, 0.1 g KCl pot-1) ; F3 = 200 kg Urea, 25 kg SP.36, 0kg KCl ha-1 (0.8 g Urea, 0.1 g SP.36, 0 g KCl pot-1); F4 = 150 kg Urea, 0 kg SP.36, 0 kg KCl ha-1 (0.6 g Urea, 0 gSP.36, 0 g KCl pot-1). The second factors were three kind of alternative fertilizers : Fr (Floran), Gn (Greener) andDg (Dekorgan) each rate 3 l ha-1 or 1.333 ml pot-1 (concentrations 3 ml l-1 water). The results indicated that theinteractions between fertilizers rates (N,P,K) with kind of alternative fertilizers were not significantly different forall variable observed. The alternative fertilizers not significantly different for all variable too but fertilizers rates(N,P,K) affected the fertile number of rice tillers and highly significantly affected to the available P and K in the soil.The treatment of 250 kg Urea, 50 kg SP.36, 25 kg KCl ha-1 gave the highest fertile tillers (37.00 tillers pot-1) andavailable P in soil (10.18 ppm) but the treatment of 300 kg Urea, 75 kg SP.36, 50 kg KCl was observed the highestavailable K in the soil. The combination treatment of 300 kg Urea, 75 kg SP.36, 50 kg KCl ha-1 with Dekorganproduced the highest rice yield (65.69 g pot-1) or 58.14 % higher than the lowest yield produced by combinationtreatment between 200 kg Urea, 25 kg SP.36, 0 kg KCl ha-1 and Dekorgan.
Hubungan Kecepatan Angin dan Kelembaban Udara terhadap Pemencaran Konidium Cercospora nicotianae pada Tembakau RAFIQI TANTAWI, AHMAD
AGRITROP Vol. 26, No. 4 Desember 2007
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Abstract

One of the limiting factors in tobacco production is frogeye leaf spot, a fungal disease caused by C. nicotianae.Epidemic of this disease was supposed to have a close relationship with weather aspects, such as wind velocity,temperature, solar radiation intensity and relative humidity. An experiment was conducted to determine relationshipbetween wind velocity and relative humidity to conidial dispersal on tobacco. The experiment carried out at MycologyLaboratory, Study Program of Plant Pest and Disease, Faculty of Agriculture, UGM and two tobacco plantations inJember and Klaten. The results showed that conidia was dispersed by wind and can be trapped by Kiyosawa typeof wind vane rotary spore trap. Conidia were dispersed in dry, and moist, as well as wet months. During the dryand moist month, conidia was trapped since 06.00 a.m. the trapping reached its peak at 02.00-06.00 p.m., while inwet month at 10.00 a.m. to 14.00 p.m. Dry air condition was needed in conidium releasing. The number of conidiawas decreased when relative humidity increased.
Pengaruh Jenis Pupuk Kandang dan Jarak Tanam terhadap Pertumbuhan Gulma dan Hasil Jagung Manis ARI MAYADEWI, NI NYOMAN
AGRITROP Vol. 26, No. 4 Desember 2007
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Abstract

The experiment aimed to find out the effect of different manure materials and proper corn plant spacing on weedgrowth and sweet corn yield. The experiment was conducted in Agricultural Training, Research and Development(ATRD), Gadjah Mada University. The experiment was a factorial experiment in a split plot design with threereplications. As the main treatment was different manuring, consisting of (1) no manure, (2) cow manure, (3) goatmanure, and (4) chicken manure. Plant spacing consisting of : (1) 100 cm x 20 cm, (2) 50 cm x 40 cm, and (3) 80cm x 25 cm, served as sub treatments. The results showed a significant interaction between manuring and plantspacing with respect to weed growth and sweet corn yield. The lowest weed dry weight when corn plants werespaced at 50 cm x 40 cm, and chicken manuring was given. Chicken manuring produced the highest ear yield,162.43 g/plant; mean while, plant spacing of 50 cm x 40 cm produced the highest ear yield, amounting to 154.44g/plant. Chicken manuring to sweet corn plants spaced at 50 cm x 40 cm gave the largest marketable ears, 11.567t/ha.

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