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Forum Pasca Sarjana
Published by Institut Pertanian Bogor
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Articles 129 Documents
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Pengaruh Penggenangan Pada Berbagai Fase Pertumbuhan Kedelai (Glycine Max (L.) Merr) Terhadap Pertumbuhan dan Produksi Bangun Tampubolon; Joedojono Wiroatmodjo; Justika S Baharsjah; . Soedarsono
Forum Pasca Sarjana Vol. 12 No. 1 (1989): Forum Pascasarjana
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Abstract

The soybean (Glycine rnax (L.) Merr) plant is able to make morphological adaptations to flooding such as the formation of adventive roots. Long-term continuous flooding result in reductive conditions in the rhizosphere which is detrimental to plant growth. This experiment was conducted to investigate the influence of flooding at various stages of soybean development on growth and yield of the crop on Alluvial and Red Yellow Podsolic soils. Flooding invariably resulted in the reduction of the net assimilation rate and yield of soybean. Reduction depended on the time and duration of flooding. Flooding during active vegetative growth (PI), flowering-pod filling (P2), seed ripening (P3), active vegetative growth and flowering-pod filling (P4), active vegetative growth and seed ripening (PS), flowering-pod filling and seed ripening (P6), and active vegetative growth until seed ripening (P7) respectively resulted yield reductions of 20.42, 50.74, 9.43, 46.68, 30.28, 52.63 and 35.26% compared to the unflooded control. The number and dry weight of root nodules and nitrogen fixation rate were highest in the P4 and P7 treatments. Nodules were formed on the adventive roots, when the soybean plants were flooded.
Computation Technique to Estimate Recombination Value, With an Example Loci of MDH, Esterase and Hypocotyl Colour of Setaria italica Muhammad Jusuf
Forum Pasca Sarjana Vol. 12 No. 1 (1989): Forum Pascasarjana
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Abstract

Coefficient of recombination between two loci can be estimated from it's maximum likelihood function. Newton approximation method that was combined with computer programation can be used on that estimation. Application of this method to data of Setaria italica F2 population, showed recombination coefficient between Est-3 and MDH-I loci is 33.25 + 2.92% and between hypocotyl color and EST-2 loci is 10.21 + 3.25%.
Variability Analysis Of Several Soybean Mutants And Varieties II. Electrophoretic Study Of Seed Globulin And Albumin M Jusuf; N Marina; U Widyastuti; A Girindra
Forum Pasca Sarjana Vol. 13 No. 2 (1990): Forum Pascasarjana
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Abstract

Albumin dan globulin were extracted from seeds of ten mutants and twelve varieties of soybean. The electrophoregrams of albumin and globulin had respectively six and four zones. Each zone was assumed equivalent to one gene locus. The different pattern of electrophoretic bands in each zone was interpreted as different types of alleles. Based on those assumptions, on the albumin it was observed that one locus was monomorph, two loci had two alleles, and two other loci had three alleles. On globulin there were three loci that contained three alleles and one locus had two alleles. Based on electrophoretic data the twenty two varietiedmutants could be divided into three groups and three separated sole varietyhutant. Group 1 consisted of m24, Japanese Soybean and wild soybean; Group I1 contained m l l , m28, m17, Wilis and Kerinci; and into Group 111 was classed m02, m03, m13, m24, Shakti, Orba, Black Soybean, Americana, Muria and Galunggung. The mutants and variety that were separate from the others were m20, m08 and Ringgit.
Response of Soybean (Glycine max (L.) Merr.) to Micronutrients Zn, Cu, B at Some Dosages of Manure on Latosol Soil Maya Melati; Fred Rumawas; Justika S Baharsjah; IPG Widjaja Adhi
Forum Pasca Sarjana Vol. 14 No. 1 (1991): Forum Pascasarjana
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Abstract

The experiment was conducted on a Latosol soil at Cikarawang, Bogor, to investigate the response of plant growth, production and seed size of soybean (Glycine mw (L.) Merr.) to applications of chicken manure and micronutrients (Zn, Cu, B). Manure application increased plant growth, yield and seed size. Yield and seed size were highest at the 15 tons manure/ha treatment, without micronutrients. Manure increased P concentrations in leaves and total nutrient uptake, but reduced Ca, Zn, Cu, and B levels. Without manure, the acid soil caused insufficient P availability. Since Ca and Mg were also shown to be in short supply, the soil should be limed with dolomite. This treatment would alleviate N deficiency through better nodule development.
The Effect of Phosphorus Fertilization and Variety on The Growth and Production of Soybean (Glycine m a (L.) Merr) Under Saturated Soil Culture Munif Ghulamahdi; Fred Rumawas; Joedojono Wiroatmodjo; Jajah Koswara
Forum Pasca Sarjana Vol. 14 No. 1 (1991): Forum Pascasarjana
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Abstract

The objective of this expaiment was to study the effect of phosphorus fertilization on the growth and production of Americana and Lokon under saturated soil culture. The experiment was conducted at the Cikarawang Experimental Station, IPB, on a Latosol, from November 1988 until April 1989. Soybean yield did not respond to the phosphorus application, and maybe due to improved soil P availability under saturated condition. Leaf P concentrations at 9 weeks were sufficient (0.303 to 0.357%) for all levels of treatment. Active nodule growth was longer under saturated soil culture than conventional irrigation. Maximum active nodule growth under conventional culture was reached at 6 weeks, but under saturated soil culture was still increasing between 6 to 9 weeks from 0.175 to 0.342 g/plant for Americana and from 0.162 to 0.260 g/plant for Lokon. Increase of active nodule dry weight was followed by increase of leaf N concentration between 6 to 9 weeks from 3.366 to 3.674% for Americana, and from 3.382 to 3.695% for Lokon. Americana was more tolerant than Lokon to saturated soil culture. Number of Tied pods, 100- sads weight, and seed dry weight/plot of Americana were bigger than Lokon.
The Genetic Estimation of Fruit Component Parameters of Seven Coconut Populations Without a Progeny Test Dwi Asmono; Alex Hartana; Edi Guhardja; Sudirman Yahya
Forum Pasca Sarjana Vol. 16 No. 1 (1993): Forum Pascasarjana
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Abstract

Heritability of fruit characters, such as fruit weight, husk weight, husk thickness, sheal weight, endosperm (water) weight, albumen weight, copra weight, oil content, fruit length and ftuit width. have been estimated on seven coconut populations. The results showed that most of the fruit components of Malayan Red Dwarf (MRD) and Malayan Yellow Dwarf (Mm)had relatively high heritability (>0.80), except fruit weight of MRD (0.74) and albumen weight of MYD (0.78). On the other hand, the heritability of those characters in tall populatidns varied between population. All of fruit characters on Polynesian Tall (PYT) and Seruwai Tall (SAT) had relatively high heritability (>0.80). On West African Tall (WAT), most Of the heritability of the fruit characters were relatively high (>0.80). except husk weight (0.75). endosperm weight (0.79) and oil content (0.41). Heritability of seven characters of Bali Tall (BLT) were relatively high, but those of three characters were relatively low; i.e. husk weight (0.52). fruit width (0.56) and husk thickness (0.71). Three fruit characters of Rmnell Tall (RLT) shown higher heritability. those are husk thickness (0.87), endosperm weight (0.92) and fruit length (0.90).
Prediction of runoff, sediment yield and their quality using ANSWERS model at Batujai reservoir area, West Nusa Tenggara Gatot Irianto; Hidayat Pawitan; . Soedarsono; H. Soewardjo
Forum Pasca Sarjana Vol. 16 No. 1 (1993): Forum Pascasarjana
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Abstract

The possibility of ANSWERS model application for predicting runoff and sediment yield is discussed in this paper. Three types of rainfall duration (e.i. 6; 8 and 10 hours) with three amount of total rainfall of 100; 200 and 300 mm and two different systems consistink of four kinds of land use were used for simulating runoff and sediment yield. The result showed that the runoff initiation was identified at 189 minutes from the start of rainfall when the amount of rainfall total was 200 mm with 8 hour duration (about 0.0001 inch/hour). The initial sediment yield was shown to be about 0.45 kg at 188 minutes from the begining of rainfall when rainfall total w+ 300 mm with 6 hour duration. Actual runoff and maximum sediment yield were recorded about 0.0017 inchlhour and 12.000 kg respectively. The land use which were considered as potential for erosion protection were mixed gardpn and wet rice. The considered land use would reduce runoff and sediment yield about 50% than traditional land use. The type of output indicates that ANSWERS model is promising for predicting runoff and sediment yield.
Isolation and Identification of Serum Gamma Immunoglobulin (IgG) of Native and Imported Chickens By Ion Exchange Chromatography and Immunochernistry Methods Murniaty Simorangkir; Aisjah Girindra; Fachriyan H. Pasaribu; Wasmen Manalu
Forum Pasca Sarjana Vol. 18 No. 1 (1995): Forum Pascasarjana
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Abstract

The study was designed to isolate and identify serum IgG of native and imported chickens, after being immunized with Newcastle Disease Vaccine. The isolation method used was the DEAE-Cellulose ion exchange chromatography using 0.01 M Tris-HCl buffer, at pH 8.0, with linear gradient NaCl from 0.01 M to 0.30 M after salting out with anhydrous Na2SO4. Identification of IgG characteristics carried out using the Ouchterlony double immunodiffusion, immuno-electrophoresis and SDS-PAGE 8% methods. Serum fractionation of native and imported chickens using the DEAE-Cellulose chromatography, after salting out with anhydrous Na2So4 of 18,14 and 14% resulted in four peaks of protein fractions.
The Estimation of Price Sensitivity Curves Using Generalized Linear Models Hari Wijayanto; Khairil A. Notodiputro; . Barizi; Jajah K. Wagiono
Forum Pasca Sarjana Vol. 18 No. 1 (1995): Forum Pascasarjana
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Abstract

The estimation of price sensitivity curves is usually based on historical data of the product. The estimates obtained, however, are potentially biased especially if the previous condition does not reflect the current market situation. alternativety, the estimation could be based on preference data. This paper introduces the use of Generalized Linear models to estimate the curve based on preference data.
Covariance Analysis of Heterogenous Group Data Mohammad Masjkur; M. Sjarkani Musa; . Aunuddin; Oetit Koswara
Forum Pasca Sarjana Vol. 18 No. 2 (1995): Forum Pascasarjana
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Abstract

This paper discussed the important of concomitant variables in regression analysis. Particularly, it was shown that without considering concomitant variables none of the combined regression models was reliable. In fact, the highest coefficient of determination R' was obtained from Mediterran soil group of data (65.8%). although R' for each specimen varied from 72.8% to 97.7%. Considering K-soil contents as concomitant variables, it was shown that the coefficient of determination increased by 18 2% to 85.3%. The resulting R* for each model was ranging from 67.1% to 93.6%. Another important finding from the research was the incorporation of concomitant variables resulted in more symmetric data distributions, smaller variances, and substantial increase in the regression slopes.

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