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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.
Arjuna Subject : -
Articles 5 Documents
 1 
Search results for , issue "Vol 20, No 2 (2019): December 2019" : 5 Documents clear
FLOWER BUD REMOVAL AND EARTHING UP TIME INCREASED GROWTH AND TUBER YIELD OF POTATO AT EASTERN TIGRAY, ETHIOPIA Gebregwergis Fitsum; Mehari Gebremichael; Hailay Gebremedhin
Indonesian Journal of Agricultural Science Vol 20, No 2 (2019): December 2019
Publisher : Indonesian Agency for Agricultural Research and Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/ijas.v20n2.2019.p77-85

Abstract

In Ethiopia, potato is a staple food crop and source of cash income for smallholder farmers, but the national average yield in farmers’ field is lower than experimental yields due to poor agronomic activities. The study aimed to determine the effects of flower removal and earthing up time on growth and tuber yield of potato. The experiment comprised of three flower removal stage and five earthing up time treatments, which were laid out in a randomized complete block design of 3x5 factorial arrangements with three replications. Results indicated that plant height, stem number, tuber length and tuber diameter were shown significantly affected (p < 0.05) by the main effect of flower removal and earthing up time but not by their interaction. Fresh shoot biomass and physiological maturity were recorded significantly affected (p < 0.05) by earthing up time, but not by flower removal stage and its interaction with earthing up time. Total fresh biomass, marketable and unmarketable tuber yield, as well as total tuber yield were significantly affected (p < 0.05) by main factors and their interaction effects. The results clearly indicated that the highest total tuber yield (30.96 ton ha-1) was recorded from flower bud removed potato earthed up at 15 days after complete emergence. Therefore, flower bud removed potato earthed up at 15 days after full emergence was better in terms of all yield contributing characters and tuber yield.
GENETIC VARIABILITIES OF AGRONOMIC TRAITS AND BACTERIAL LEAF BLIGHT RESISTANCE OF HIGH YIELDING RICE VARIETIES Nafisah Nafisah; Celvia Roza; Nani Yunani; Aris Hairmansis; Tita Rostiati; Ali Jamil
Indonesian Journal of Agricultural Science Vol 20, No 2 (2019): December 2019
Publisher : Indonesian Agency for Agricultural Research and Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/ijas.v20n2.2019.p43-54

Abstract

Hundred of high yielding and bacterial leaf blight (Xanthomonas oryzae pv. oryzae, Xoo) resistant rice varieties released since the 1960s are important sources of genetic materials for exploring superior genotypes. The study aimed to evaluate the genetic resistance of 177 rice varieties to Xoo and their agronomic traits. The evaluations were conducted at the Indonesian Center for Rice Research Experimental Station during the wet season (December 2015-March 2016). The bacterial leaf blight resistance was evaluated for Xoo pathotypes III, IV, and VIII using the clipping method. The genetic variation among genotypes was categorized as low (0–10%), medium (10–20%), and high (>20%), whereas the heritability was categorized as low (0-30%), medium (30-60%), and high (>60%). The variability of resistance to Xoo pathotypes, grain yield, and spikelet fertility was low, while the variability of plant height, productive tiller number, filled grain, and total spikelet was medium, and the variability of unfilled grain number was high. The 29 varieties  were categorized as superior based on their agronomic traits or resistance to Xoo pathotypes. In conclusion, Batutegi and Fatmawati were superior in the total spikelet number, while Rojolele and Inpari 2 were supreme in the thousand-grain weight. Dodokan had a very short maturity, and Inpari 24, Conde, Kalimas, Angke, Inpari 17, and Inpara 8 had the highest resistance to Xoo pathotypes. The study implies that the identified rice superior genotypes could be used as genetic materials to design cross combinations for higher yield potential and BLB resistance varietal improvement.
Bacillus atrophaeus MFDV2 RHIZOBACTERIA ISOLATE INCREASES VEGETATIVE GROWTH, YIELD, AND FRUIT SIZE OF BANANA PLANT Lütfi Pırlak; Yaşar Akbaş; Mesude Figen Dönmez
Indonesian Journal of Agricultural Science Vol 20, No 2 (2019): December 2019
Publisher : Indonesian Agency for Agricultural Research and Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/ijas.v20n2.2019.p55-60

Abstract

Plant growth-promoting rhizobacteria have important roles in soil fertility and have been manipulated for ecologically friendly crop production. The study aimed to determine the effects of a biological agent (Bacillus atrophaeus MFDV2) on the growth, yield, and quality of the banana plant. The study was conducted in 2017–2018 using the banana Dwarf Cavendish clone. Bacterial isolate was cultured on nutrient agar and stored at 30 °C for 24 hours. The culture was then suspended in 0.1 M phosphate buffer to 109 CFU ml-1. The bacterial suspension was applied as foliar, soil and foliar + soil once every two months starting from February. One liter of suspension was applied on the soil and over the leaves per plant. The results showed that the effect of bacterial treatment did not increase stem circumference and leaf length, but it was a significant increase in plant height, leaf number, and leaf width. The effects of bacterial application on banana bunch weight and fruit growth were statistically significant. All applications significantly increased the weight, with the highest increase occurring in foliar finger + soil application. While the effects on the finger diameter were statistically similar. Application on leaf + root has been the biggest increase in finger length. The effects of bacterial applications increased N, P, and K contents in the leaves. The study concluded that the application of Bacillus atrophaeus MFDV2 increased the vegetative growth and fruit quality of the banana plant, so it is advisable to be used in organic banana farming.
THE TOLERANCE AND YIELD COMPONENTS OF RICE BREEDING LINES SELECTED UNDER LOW AND OPTIMUM NITROGEN CONDITIONS Angelita Puji Lestari; Suwarno Suwarno; Trikoesoemaningtyas Trikoesoemaningtyas; Didy Sopandie; Hajrial Aswidinnoor
Indonesian Journal of Agricultural Science Vol 20, No 2 (2019): December 2019
Publisher : Indonesian Agency for Agricultural Research and Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/ijas.v20n2.2019.p61-68

Abstract

One of the important issues on rice breeding is to develop new rice lines suitable for nitrogen efficiency in the suboptimum environment. The study aimed to evaluate the tolerance and yield components of rice breeding lines selected under low and high nitrogen conditions. The F6 generation from two cross-combinations of Gampai/IR77674 and Progol/Asahan, were evaluated in the dry season of 2014 under N suboptimum and N optimum conditions. A total of 172 lines plus six check varieties derived from the low and high N environment selection were evaluated under low N rate (34.5 kg N ha-1) and high N rate (138 kg N ha-1), arranged in an augmented design. Six check varieties were relocated three times in each block. Plot size was 5.5 m2 and plant spacing 20 cm x 20 cm. Data were collected for grain yield and major yield components. Results showed that the different status of nitrogen fertilizer affected the number of productive fillers, number of filled grains, 100-grain weight, and grain yield. Different cross combinations exhibited different results in the progeny performance. Ten lines have a higher yield also tolerant to low N condition, i.e. B14250F-6-9, B14250F-1-4, B14250F-9-9, B14250F-6-4, B14250F-5-2, B14262F-15-6, B14250F-2-6, B14262F-12-4, B14250F-5-1, and B14250F-11-4. Thus, to obtain the N tolerant lines, selection at a low N environment was more effective compared with the optimum selection environment.
PRIMARY AND SECONDARY SOMATIC EMBRYOGENESIS OF CACAO: THE EFFECT OF EXPLANT TYPES AND PLANT GROWTH REGULATORS Nur Ajijah; Rr Sri Hartati
Indonesian Journal of Agricultural Science Vol 20, No 2 (2019): December 2019
Publisher : Indonesian Agency for Agricultural Research and Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/ijas.v20n2.2019.p69-76

Abstract

The success of cacao somatic embryogenesis is affected by many factors, including the basal salt medium, the genotype, the explant type, and the concentration and composition of plant growth regulators (PGRs). The study aimed to evaluate the effects of PGRs composition on the primary somatic embryo (PSE) response and the effect of explant type and PGRs composition used in inducing PSE on the secondary somatic embryogenesis (SSE) response. PSEs were induced from basal petal and staminoid explants of MCC 01 and MCC 02 clones on DKW medium containing 2,4-D 2 mg l-1 + kinetin 0.5 mg l-1 or 2,4-D 2 mg l-1 + kinetin 0.125 – 0.250 mg l-1 + thidiazuron (TDZ) 2.5 – 5 µg l-1 or 2,4-D 2 mg l-1 + TDZ 10 µg l-1. Genotype, explant type, and PGR composition dependently affected PSE response. The best PSE response was obtained from staminoid explant of MCC 02 clone on medium containing 2,4-D 2 mg l-1 + kinetin 0.5 mg l-1 (20%, 9 embryos). The explant type and PGR composition used in inducing PSEs affect the SSE response. The highest  SSE response of MCC 01 clone was obtained from petal explant with medium containing 2,4-D 2 mg l-1 + kinetin 0.5 mg l-1. The formation of SSEs could increase the multiplication rate of MCC 01 clone by 7 times.

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