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INDONESIA
Indonesian Journal of Agricultural Science
Published by Kementerian Pertanian
ISSN : 1411982X     EISSN : 23548509     DOI : -
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
The journal publishes primary research articles from any source if they make a significant original contribution to the experimental or theoretical understanding of some aspect of agricultural science in Indonesia. The definition of agricultural science is kept as wide as possible to allow the broadest coverage in the journal. Accredited base on Director Decree of Indonesian Institute of Science No. 816/D/2009 with acreditation No. 172/AU1/P2MBI/08/2009. IJAS is newly accredited by the Indonesian Institute of Science in 2012 (No. 473/AU2/P2MI-LIPI/08/2012) for period of 2012-2015.
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Articles 5 Documents
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Search results for , issue " Vol 8, No 1 (2007): April 2007" : 5 Documents clear
SELECTION RESPONSE FOR INCREASED GRAIN YIELD IN TWO HIGH OIL MAIZE SYNTHETICS Mejaya, Made J.; Lambert, R.J.
Indonesian Journal of Agricultural Science Vol 8, No 1 (2007): April 2007
Publisher : Indonesian Agency for Agricultural Research and Development - MOA

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Abstract

Selection for increased oil level in maize showed the increase wasassociated with decrease in starch concentration, kernel weight,and grain yield. The study was conducted with the objectives:(1) to evaluate response to six cycles for increased grain yieldin the high oil maize Alexho Elite (AE: 60-90 g kg-1 oil concentration)and Ultra High Oil (UHO: 100-140 g kg-1 oil concentration)using inbred tester B73; (2) to measure responses toselection for increased grain yield with changes in yield components;and (3) to determine a suitable tester. Previously the twosynthetics had been selected for oil concentration. After six cycles,the six genotypes i.e. AE C0, AE C3, AE C6, UHO C0, UHO C3,and UHO C6 were testcrossed to B73, LH185, and LH202 inbreds(40 g kg-1 oil concentration) to a total of 18 testcrosses. Twofield experiments were used to evaluate selection in AE and UHOtestcrosses. The study showed selection using inbred tester B73in AE and UHO was effective in increasing grain yield of AEtestcrosses without changing (i.e. decreasing) oil and proteinconcentrations. AE testcrosses produced higher grain yield andgreater selection response for grain yield than UHO testcrosses.LH185 was best for grain yield in AE and UHO testcrosses. Increasein grain yield in most of the testcrosses was associated withincreases in starch concentration, kernel weight, kernel number, andgrain weight.
PRINCIPAL COMPONENT ANALYSIS OF FACTORS DETERMINING PHOSPHATE ROCK DISSOLUTION ON ACID SOILS Hilman, Yusdar; Rahim, Anuar Abdul; Musa, Mohamed Hanafi; Hashim, Azizah
Indonesian Journal of Agricultural Science Vol 8, No 1 (2007): April 2007
Publisher : Indonesian Agency for Agricultural Research and Development - MOA

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Abstract

Many of the agricultural soils in Indonesia are acidic and lowin both total and available phosphorus which severely limits theirpotential for crops production. These problems can be correctedby application of chemical fertilizers. However, these fertilizersare expensive, and cheaper alternatives such as phosphate rock(PR) have been considered. Several soil factors may influencethe dissolution of PR in soils, including both chemical and physicalproperties. The study aimed to identify PR dissolution factorsand evaluate their relative magnitude. The experiment was conductedin Soil Chemical Laboratory, Universiti Putra Malaysia andIndonesian Center for Agricultural Land Resources Research andDevelopment from January to April 2002. The principal componentanalysis (PCA) was used to characterize acid soils in anincubation system into a number of factors that may affect PRdissolution. Three major factors selected were soil texture, soilacidity, and fertilization. Using the scores of individual factors asindependent variables, stepwise regression analysis was performedto derive a PR dissolution function. The factors influencing PRdissolution in order of importance were soil texture, soil acidity,then fertilization. Soil texture factors including clay content andorganic C, and soil acidity factor such as P retention capacityinteracted positively with P dissolution and promoted PR dissolutioneffectively. Soil texture factors, such as sand and siltcontent, soil acidity factors such as pH, and exchangeable Cadecreased PR dissolution.
THE ROLE OF SUBSURFACE FLOW DYNAMIC ON SPATIAL AND TEMPORAL VARIATION OF WATER CHEMISTRY IN A HEADWATER CATCHMENT Tanaka, Tadashi
Indonesian Journal of Agricultural Science Vol 8, No 1 (2007): April 2007
Publisher : Indonesian Agency for Agricultural Research and Development - MOA

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Abstract

Variation of water chemistry does not merely occur due to in situ chemical process, but also transport process. The study was carried out to address the role of subsurface flow dynamic on spatial and temporal variation of water chemistry in a headwater catchment. Hydrometric and hydrochemistry measurements were done in transect with nested piezometers, tensiometers, and suction samplers at different depths across hillslope and riparian zone in a 5.2 ha first-order drainage of the Kawakami experimental basin, Nagano, Central Japan from August 2000 to August 2001. Spatial variation of solute concentration was defined by the standard deviation and coefficient of variation of the seasonal observed concentrations. Autocorrelation analysis was performed to define temporal variation of solute concentration. The results showed that spatial variation of water chemistry was mainly influenced by the variation of subsurface flow through the hillslope and riparian zone. Solute  concentration in the deep riparian groundwater was almost three times higher than that in the hillslope segment. A prominent downward flow in deep riparian groundwater zone provided transport of solutes to thedeeper layer. Time series analysis showed that in the deep ripariangroundwater, Ca2+, Mg2+, SO42- and HCO3- concentrations underwenta random process, Na+ concentration of a random process superimposedby a trend process, and SiO2 of a random process superimposedby a periodic process. Near the riparian surface, SO42- concentration was composed of a random process superimposed by a periodic process, whereas other solutes were mainly in a random process. In the hillslope soil water, there was no trend observed for the Na+ concentration, but there were for Ca2+ and Mg2+. The magnitude and direction of subsurface flow across hillslope and riparian zone created transport and deposition processes that changed solute concentration spatially and temporally.
CHARACTERIZATION AND QUALITY ASSESSMENT OF INDONESIAN COMMERCIAL BIOFERTILIZERS Husen, Edi Husen; Simanungkalit, R.D.M.; Saraswati, Rasti; ., Irawan
Indonesian Journal of Agricultural Science Vol 8, No 1 (2007): April 2007
Publisher : Indonesian Agency for Agricultural Research and Development - MOA

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Abstract

Biofertilizers currently sold in the market are not labeled witha distinct quality standard. As such, farmers may buy low qualitybiofertilizers, which can reduce their profit and trust on the benefitof biofertilizers. This paper presents the characteristics of variousproducts of commercial biofertilizers as well as farmers’ knowledgeand experience on the products. The study was carried out in2004-2006 by collecting and analyzing data on registered commercialbiofertilizers, checking their availability at the market(39 agricultural shops), and interviewing farmers on their knowledgeand experience on the use of biofertilizers on various farmingsystems in Bandung District, West Java (86 respondents) andSemarang District, Central Java (77 respondents). The quality ofbiofertilizers was tested in the laboratory based on microbialdensity and its functional (phenotypic) traits. The study showedthat amongst various brands of biofertilizers commercialized,41 brands of them have been officially registered as commercialproducts. Two brands of other biofertilizers found in agriculturalshops were registered as organic or inorganic fertilizers. In general,each biofertilizer contained two or more microbial strains andwas claimed to have multiple functions. However, most of them(>90%) were not labeled with expiry date information. Macronutrientcontents (NPK) of some microbial carriers were almostequal to those of organic fertilizers. Around 38% of respondentsin Bandung knew biofertilizers and less than 10% have ever usedthem. In Semarang, however, familiarity and personal experienceof the respondents were much lower, i.e. 10% and 3%, respectively.About 67% and 50% of agricultural shops in Bandung andSemarang sold biofertilizers, respectively. Laboratory analysesshowed that microbial density of five biofertilizers tested waslower than that of product specification, although most of themwere positive for N-fixing and P-solubilizing traits. Some microbialstrains contained less than 103 cfu based on the dilution leveltesting. These figures imply the urgent need to improve theexisting quality standard system of biofertilizers including itscontrol mechanisms.
EFFECTS OF IRRIGATION FREQUENCY AND LEAF DETACHMENT ON CHRYSANTHEMUM GROWN IN TWO TYPES OF PLASTIC HOUSE Budiarto, K.; Sulyo, Y.; S.N., E. Dwi; Maaswinkel, R.H.M.
Indonesian Journal of Agricultural Science Vol 8, No 1 (2007): April 2007
Publisher : Indonesian Agency for Agricultural Research and Development - MOA

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Abstract

Chrysanthemum is one of important ornamentals in Indonesia and it ranks in the first quantity of cut flower marketed every year. In most cases, the low productivity is still a constraint for the traditional growers to make production process profitable. Several problems revealed in chrysanthemum production were investigated. The study dealt with the effect of two types of plastic house constructions, irrigation frequency, and leaf detachment on the growth and development of chrysanthemum. The experiment was conducted at Segunung, Indonesian Ornamental Plants Research Institute during the dry season of 2005. A nested design with six replications was used. The results showed that plants grown in wood-constructed plastic house had better growth performance and flower quality than those under bamboo plastic house. Longer stem and higher plant fresh weight with more flowers and longer life span were also observed on chrysanthemum irrigated four times per week than those irrigated twice per week. Leaf removal often practiced by the growers is no longer recommended, since the number of leaves on the plant influenced all parameters observed. The more leaves were detached, the more  negative impacts on plant growth were found.

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