Jurnal Agro Industri Perkebunan
ISSN / EISSN : 2337-9944 / 2548-9259
Current Publisher: Politeknik Negeri Lampung (10.25181)
Total articles ≅ 43
Latest articles in this journal
Jurnal Agro Industri Perkebunan, Volume 8, pp 21-32; doi:10.25181/jaip.v8i1.1285
Coffee leaf rust (Hemileia vastatrix) caused large damage on Arabica coffee in Asia, Africa, and America. The resistant genotypes released to farmers in Brazil were developed from the existing cultivars. However, the cultivars of Arabica coffee existing in North Sumatra Province of Indonesia is not yet researched to find resistant genotypes. The goal of this reseach was to determine variability of coffee leaf rust and leaf morphology. In total of 84 genotypes growing in this Province were selected using nested design. Data was analyzed using nested design, correlation, stepwise regression, and hierarchical cluster analysis. This research revealed leaf rust severity had high genotypic variation, low heritability, and high genetic adveance. Ratios of leaf morhology showed moderate to high genotypic variation and heritabilities. Leaf rust severity (y) significantly correlated with both ratio of leaf length with leaf area (x1) and ratio of leaf length with leaf width (x2) with equation y = 2,04 + 62,48x1 3,95x2 with coefficient of multiple correlation R = 0,470**. By using leaf rust severity and these two ratios in cluster analysis, one cluster comprised 18 genotypes with medium leaf rust severity. It could be concluded that resistant genotypes of Arabica coffee might be possible to develop from the existing cultivars. Leaf rust severity might not be used as selection parameter in breeding for leaf rust resistance.
Jurnal Agro Industri Perkebunan, Volume 8, pp 1-8; doi:10.25181/jaip.v8i1.1053
Providing manure can not only increase the availability of nutrients but also support the growth of microorganisms. Zeolite has a high CEC, which results in the media being able to bind water and nutrients added to the soil. This study aims to get the best type of manure on cocoa seedling growth, get the effect of zeolite smoothness on the growth of cocoa seedlings, and find out the interaction of the composition of manure and zeolite on the growth of cocoa seedlings. The research was conducted at Experimental Garden of Politeknik Negeri Lampung, from December 2017 to May 2018. The method used was the factorial pattern randomized block design (RBD) which consisted of two factors. The first factor consists of three levels, namely without manure, 200 g chicken manure, and 200 g goat manure. The second factor consisted of three levels, namely zeolite size (without zeolite, zeolite size 30 mesh, and zeolite size 16 mesh). Observation variables were plant height, leaves number, stem diameter, shoot dry weight, soil pH, and soil CEC. The results showed that manure did not show an effect on plant height, stem diameter, and leaves number, but had an effect on soil pH and soil CEC. The level of zeolite smoothness does not affect plant height, stem diameter, leaves number, and soil pH, but affects soil CEC the 16 mesh size of compared to 30 mesh size. There is no interaction on types of manure and size of zeolite fineness of plant height, stem diameter, leaves number, shoot dry weight, soil soil pH, and soil CEC.
Jurnal Agro Industri Perkebunan, Volume 8, pp 9-19; doi:10.25181/jaip.v8i1.1266
The direction of government policy is to increase plantation white sugar production. The government through the Ministry of Agriculture has launched fertilizer subsidies to support increased plantation white sugar production. Nevertheless, Indonesia's plantation white sugar production tends to experience a decline from year to year. This condition is not in line with the objectives. This study aims to evaluate the fertilizer subsidy policy in order to achieve the national plantation white sugar self-sufficiency target. The study uses multiple linear regression methods with time series data. The results of the analysis show that the application of the subsidized fertilizer policy does not significantly affect the production of plantation white sugar from sugar cane farmers. The area of sugarcane plantation is a factor that significantly influences the production of Indonesian plantation white sugar.
Jurnal Agro Industri Perkebunan, Volume 8, pp 33-41; doi:10.25181/jaip.v8i1.1371
One effort to improve quality of cocoa seedlings is application of bio fertilizer during the nursery. Nutrient supply is essential for growth and development of cocoa seedlings at nursery and field after transplanting. The aim of this research is to determine effect of bio fertilizer application to growth of cocoa seedlings. The study used a completetly randomized design with 4 treatments and 15 replications. The treatments were no fertilization (P1), chemical fertilization (P2), bio fertilizer every 2 weeks (P3) and bio fertilizer every 1 month (P4). The result showed that application of bio fertilizer every 2 weeks and 1 month can increase height, diameter and dry weight of cocoa seedlings on first until fourth months after fertilization. The Mycorrhizal Dependency (MD) of cocoa seedlings was classified as moderately dependent (27,0445,86%). The highest colonization of arbuscular mycorrhizal fungi on roots cocoa resulted by P4 treatment about 33,92%.
Jurnal Agro Industri Perkebunan, Volume 8, pp 49-59; doi:10.25181/jaip.v8i1.1392
West Lampung Regency still survives as the central area of coffee production in Lampung Province while production of other districts so far are declining. This research aims to study the ethno-agronomy of coffee cultivation in West Lampung which is tolerant to rainfall variability. This research was a survey located in Sumberjaya District and Sekincau District, West Lampung Regency, Lampung Province, Indonesia year 20182019 which from each subdistrict two villages was selected purposively and from each village one farmer group was chosen. Primary data were collected through interview, Focused Group Discussion (FGD), and observation of coffee farm. Secondary data were obtained from the BPS Lampung and rainfall data from Radin Intan Climate Station. The results showed that the area of coffee plantations in West Lampung in the last decade has decreased by 0,64% per year but productivity has increased by 1,42% per year, and in West Lampung, which is a mountainous region, the number of rainy days was negatively correlated with coffee yield while the number of dry months was positively correlated. Whereas in North Lampung, which is a medium elevation area, coffee productivity correlated with sufficient rainfall and productivity was negatively correlated with the number of dry months of the previous year. Coffee farmers in West Lampung have perception the need for various adaptation measures of coffee farm maintenance, which grafting adult coffee tree with superior local robusta clones is a typical ethno-agronomy practiced by coffee farmers in West Lampung to obtain high coffee yield.
Jurnal Agro Industri Perkebunan, Volume 8, pp 43-48; doi:10.25181/jaip.v8i1.1373
At this time there is the development of coconut plantations in the community, so that the need for coconut seeds continues to increase, to meet these needs it needs to be supported by the provision of good quality coconut seeds, worth planting in the field and have the criteria for simultaneous sprouts and high viability. Results seedling seed growers by famer have an average of 80% germination with a seed age of 11 and 12 months. This study aims to determine the ideal age of seeds to be used as seeds that have germination speed and high viability. The research was conducted using two treatments consisting of coconut seeds aged 11 months and coconut seeds aged 12 months. Each treatment contained 100 plants so that 200 coconut seeds were used. The difference in age of coconut seeds gives significantly different results when they appear germination, the fastest results obtained on 12-month-old seeds. At the sprout power the highest yield was obtained for coconut seeds aged 12 months.
Jurnal Agro Industri Perkebunan, Volume 8, pp 21-31; doi:10.25181/jaip.v8i1.1390
Fusarium oxysporum is a pathogen that causes wilt in oil palm and can cause oil palm sprout decay. The study aimed to determine the effectivity of mangosteen peel extract (Garcinia mangostana L.) in inhibiting the growth of Fusarium oxysporum in vitro and in vivo. The research was conducted in November 2017 to June 2018 at the Politeknik Negeri Lampung. The method used was a completely randomized design (CRD) consisting of 5 treatments, namely the concentration of mangosteen peel extract 0% (control), 15%, 30%, 45%,and 60%. Data were analyzed using analysis of variance (ANOVA) and further tests of mean values using the LSD test. The results showed that mangosteen peel extract affected the percentage of inhibitory zone extract in Fusarium oxysporum in vitro at concentrations of 15%, 30%, and 45% respectively at 25,92%, 29,06% and 35,95%. The treatment of mangosteen peel extract also affected the percentage of disease incidence and number of leaves in in vivo testing.
Jurnal Agro Industri Perkebunan, Volume 7, pp 69-76; doi:10.25181/jaip.v7i2.1063
This study aims to obtain the best slurry dosage for the growth of cocoa seedlings. This reaserch was conducted in the experimental garden, chemical analyzed laboratory, and soil laboratory of Politeknik Negeri Lampung on November 2017 until March 2018. The method used was a Completely Randomized Design (CRD) with 6 doses of slurry (0 ml, 80 ml, 160 ml, 240 ml, 320 ml, and 400 ml). Observation variables in the form of premilinary observations abd observations during the study. Preliminary observations analyzed the levels of N, P, K, pH, and C-Organic on topsoil and slurry. Obsevation during the study were plant height, stem diameter, number of leaves, dry weight of shoot dry weight, root dry weight, and moisture content. The results showed that slurry doses did not affect on the cocoa seedling growth.
Jurnal Agro Industri Perkebunan, Volume 7, pp 77-85; doi:10.25181/jaip.v7i2.1055
Smoke liquid for latex coagulant is one of the solution to avoid the negative impact of not recomended coagulant such as vinegar, TSP fertilizer and alum. Coconut fiber has lignin content so that it can be processed into liquid smoke. The aim of this study was to determination the best dose of coconut fiber liquid smoke for latex coagulant and the effect on the quality of SIR product. The treatment used in this study was the dose of coconut coir liquid smoke (formic acid (control) 4.76% v/v, 13.04% v/v, 14.89% v/v, 16.67% v/v, 18 v/v, 36% v/v, and 20% v/v). The results showed that the coconut fiber liquid smoke with dose 20% v/v gave the best result on time for clumping latex, total coagulum and total rubber yield. Based on quality data, a dose of 20% v/v include SIR 20 quality.
Jurnal Agro Industri Perkebunan, Volume 7, pp 59-68; doi:10.25181/jaip.v7i2.1156
Basal stem rot (Ganoderma boninense) is one of the main diseases of oil palm. The objective of the research was to obtain indigenous rhizobacteria (RBI) isolate which have the ability increase growth and to control basal stem rot on oil palm seedlings in planta. Experimental research consists of 3 stages by using Completely Randomized Design (CRD). Indigenous rhizobacteria isolate testing as plant growth promoting rhizobacteria (PGPR) and to control of G. boninense on pre-nursery of oil palm consisted of 29 treatments (27 RBI isolates, without G. boninense inoculation as positive control, and G. boninense inoculation as negative control) with 5 replications each. Data were analyzed by variance, if the result significantly different, it was continued by using Least Significance Different (LSD) at 5% level. The results showed that two of the best isolates were RZ2E 2.1 and RZ2E 1.2 which were able to increase growth and were able to suppress the development of basal stem rot G. boninense.