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Published by Universitas Sumatera Utara
ISSN : 26557576     EISSN : 23564725     DOI : https://doi.org/10.32734/jpt.
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Tropical Agriculture Journal (JPT) is a peer-reviewed online journal of Agriculture Postgraduate Study Program Universitas Sumatera Utara (USU). Journal is a result of research, or scientific reviews of researchers, students and agricultural institutions, and others related to agricultural studies in the tropical region. Published in Indonesian and English language with 3 volumes/year (April, August, December). These articles are indexed by Google Scholar, PKP Indexing, RootIndexing, Portal Garuda, Indonesian Publication Index (Garuda Portal), One Search Perpustakaan Nasional, BASE (Bielefeld Academic Search Engine), and Directory of Research Journal Indexing (DRJI), JPT is member of AJPI (Association of Indonesian Agriculture Journal, and strives to be a means of periodic, accredited, national scientific publications or reputable international publications through.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 378 Documents
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Agronomy Performance and Resistance of Shallots against Fusarium Wilt Disease under Various Salicylic Acid Treatments Khotimah, Khusnul
Jurnal Online Pertanian Tropik Vol. 9 No. 2 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jopt.v9i2.9500

Abstract

This research aims to know the agronomic character and resistance of shallots against fusarium wilt disease under various salicylic acid treatments. This research was conducted in a greenhouse using a completely randomized design with one factor, namely the treatment of salicylic acid concentrations (0 ppm, 15 ppm, 20 ppm, and 25 ppm) with 3 replications. Each treatment was inoculated with Fusarium acutatum inoculum (106 conidia ml-1 distilled water) except for the negative control, without being inoculated with Fusarium acutatum inoculum. The materials used included shallot bulbs of the Tajuk variety, synthetic salicylic acid, Fusarium acutatum inoculum. Variables of observation of agronomic characters include; plant height, number of leaves, fresh tuber weight while the disease component variables include; incubation period, and disease incidence. The data obtained were analyzed by analysis of variance (ANOVA) with a significance level of 95%, then the DMRT test (95%) was carried out to determine the differences between treatments. The results of the analysis of variance showed that there was a significant difference between the 0 ppm treatment (control) and the 15, 20, and 25 ppm treatment on the characters of plant height, fresh weight, and disease incidence. Meanwhile for the character of the number of leaves and incubation period there was no significant difference between the control and salicylic acid treatment. Salicylic acid treatment at a concentration of 15 ppm showed the highest plant height (34.26 cm), the highest number of leaves (24.46 strands), the highest fresh tuber weight (6.30 g), and the least disease incidence (14.55%).
Provision of Urea Fertilizer and Organic Fertilizer of Rice Husk Charcoal on the Growth of Oil Palm Seeds FS, Harahap; Arman, Iman; Harahap, Nurliana; Fauzi Ahmad, Syawaluddin
Jurnal Online Pertanian Tropik Vol. 9 No. 2 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jopt.v9i2.9534

Abstract

Good seed growth is a factor in the success of oil palm cultivation due to genetic pre-nursery factors in the field, so that the provision of nutrients in the initial seed growth plays an important role in determining the overall appearance of the seedlings during its growing period. This study aims to determine the effect of oil palm seed growth by applying Uera fertilizer and rice husk charcoal organic fertilizer during the pre-nursery in the field. The experiment was carried out from October 2020 to May 2021 in the experimental garden of the Faculty of Science and Technology, Labuhanbatu University, Rantauprapat at an altitude of 13 meters above sea level. The experimental design in this study was a randomized block design with a factorial pattern that was repeated three times. The first factor is the dose of Uera fertilizer which consists of four levels, namely U0 = 0 kg / ha, U1 = 100 kg / ha, U2 = 200 kg / ha, U3 = 300 kg / ha and the second factor includes the dose of Rice Husk Charcoal Organic Fertilizer (ton / ha) consists of three levels, namely A0 = 0 ton / ha, A1 = 100 ton / ha, and A2 = 200 ton / ha. The results of the experiment showed that there was an interaction effect of uera fertilizer and rice husk charcoal organic fertilizer on plant height (cm),leaf area of ​​oil palm seedlings (cm2), in the number of leaves (leaf) and accretion hump diameter (mm). Treatment of urea fertilizer of 300 kg / ha and organic fertilizer of rice husk charcoal as much as 20 tons / ha produced plant height and leaf area during the pre-nursery
Utilization of Biomass in The Form Biochar and Compost on Soil Properties Hidayat, Benny; Sebayang, Nur Ulina W; Jamilah; Atria Utami
Jurnal Online Pertanian Tropik Vol. 9 No. 3 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jopt.v9i3.10708

Abstract

Indonesia merupakan salah satu negara penghasil biomassa terbesar. Secara umum pemanfaatan biomassa dilakukan dengan cara pengomposan, menghasilkan humus yg sangat berguna bagi tanaman, tetapi proses pengomposan akan banyak menghilangkan karbon dan lepas ke udara, dan ini merupakan masalah besar bagi dunia karena akan meningkatkan pemanasan global. Tetapi ada bentuk lain pemanfaatan biomassa yg terkini yaitu dikonversi dalam bentuk biochar yg diketahui mempertahankan karbon dalam jangka yg cukup lama bahkan hingga ratusan tahun. Meskipun kompos relatif mudah terdekomposisi, tetapi memiliki kelebihan dalam menyediakan unsur hara dalam jangka pendek, sedangkan biochar dapat digunakan sebagai bahan amandemen tanah dalam waktu panjang. Melihat potensi yang ada pada konversi biomassa dalam bentuk kompos dan biochar dalam sehingga diperlukan tulisan untuk menelaah manfaat dan kegunaan kedua bentuk hasil konversi biomassa ini, khususnya dalam memperbaiki sifat kimia tanah, sehingga kita dapat memilih mana yang terbaik dalam pemanfaatan biomassa untuk kelangsungan kehidupan manusia dan alam sekitarnya.
Effect of Blotong Compost Bio Fertilizer on Early Growth of Sugar Cane (Saccarum Officinarum) Supandji; Edy Kustiani; Muhammad Muharram; Virgian Galuh Agusty; Yoyok Zakaria
Jurnal Online Pertanian Tropik Vol. 9 No. 3 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jopt.v9i3.9036

Abstract

Bio-compost can help increase water holding capacity, because in addition to containing a lot of organic matter, it also makes the soil hygroscopic and the structure becomes crumbly. Giving Blotong bio-compost at a dose of 80 tons / ha is very good because it increases the development of sugarcane roots and can increase production. The purpose of the study was to determine the effect of bio-compost blotong on the growth of sugarcane (Saccharum officinarum). The research was conducted in the field of Tegal which is located in the village of Blabak, Kandat sub-district, Kediri Regency. altitude of 100 masl. This research was carried out in the field using a one-factor Randomized Block Design (RAK) where the treatment factor was blotong dose: B0 = 0 tons ha-1, B1 = 5 tons ha-1, B2 = 10 tons ha-1, B3 = 15 tons ha-1, B4 = 20 tons ha-1, B5 = 25 tons ha-1. Parameters of observations made consisted of: Growth Percentage, Plant height, Number of leaves, Number of tillers, Stem diameter. The results of the research on the treatment of Blotong bio-compost fertilizer were significantly different, with the highest percentage of plant shoot growth at a dose of 20 tons ha-1, which was 89.17%. Plant height with a dose of 20 tons ha-1 is 94.75 cm. The highest number of leaves of the plant was 16.25 cm. The highest number of tillers of the sugarcane plant was 9.22 stems, the diameter of the stem of the highest sugarcane plant was 15.95 cm.
The Contribution of the Community Forest Program to the Income of the Lumban Lansang Forest Farmer Group, Siantar Utara Village, Parmaksian District, Toba Samosir Regency. Perangin-Angin, Gita Perdamen; Nurul Qomar; Yulia Andriani
Jurnal Online Pertanian Tropik Vol. 9 No. 3 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jopt.v9i3.9234

Abstract

Community Forest is a state forest concession that is utilized and aimed at empowering and increasing the income of local communities by improving community welfare. North Siantar Village is a Community Forestry location in Toba Samosir district with the Lumban Lansang Forest Farmer Group (FFG) as the manager of the area. The purpose of this study was to analyze the contribution of Community Forest concessions to the income of Lumban Lansang FFG. This study uses observation and interview techniques with all members of the Lumban Lansang FFG (55 persons) to collect primary data which includes how to manage Community Forest by FFG, FFG knowledge of Community Forest, problems faced by FFG while managing Community Forest, and FFG income from Community Forest management. Documentation studies are obtained by studying several books, journals, the internet, and documents from related institutions. The analysis used to calculate the contribution of Community Forest is quantitative analysis and analysis of income from data that has been obtained in the field by adding up income from agricultural, non-agricultural activities, activities in Community Forest and other income. The results showed that the concession of Community Forest could contribute income to Lumban Lansang FFG of Rp. 269.950.000/year for all members of the Lumban Lansang FFG, and contributes to the total income which is 23.91%. Keywords: community forest, forest farmer group, income
The response of oil palm seedlings' growth to vermicompost and water stress under the main nursery stage Kautsar, Valensi; Ismawanto, Diky; Dyah Ully Parwati, Wiwin
Jurnal Online Pertanian Tropik Vol. 9 No. 3 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jopt.v9i3.9933

Abstract

The availability of nutrients and water are two things that are essential for the development of plants. Future oil palm agriculture will require a strategy for the management of water because of the erratic nature of the weather. The addition of organic matter, such as vermicompost, is one strategy for addressing the issue of insufficient water supplies. The primary objective of this study is to investigate the relationship between oil palm seedlings' exposure to vermicompost and various levels of water stress in the main nursery. During the three-month study, 100, 200, and 300 g of vermicompost per polybag was combined with 1.0, 1.5, and 2.0 L/polybag/day. There was no relationship between the dose of vermicompost and the water stress that had observed. The addition of 300 g/polybag of vermicompost increased root fresh weight by 37.8% compared to 100 g/polybag. Moreover, water stress leads to a reduction in plant height and dry weight of the shoots. Compared to 2 L/polybag/day, plant height was lowered by 23.3% and 19.8% at watering volumes of 1.0 and 1.5 L/polybag/day, respectively. In addition, when compared to the appropriate water level of 2 L/polybag/day, high water stress (1.0 L/polybag/day) declined shoot dry weight by 12%.
Study of the Use of Yeast Types and Soaking Time on the Quality of Cocoa Beans (Theobroma cacao L.) Paramuji, Muji; Wanbahroni Jiwar Baru; Wahyu Syahputra
Jurnal Online Pertanian Tropik Vol. 9 No. 3 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jopt.v9i3.10215

Abstract

The quality of cocoa beans at the farmer level is very low. The main factor that makes the quality of cocoa is low, it of which is fermentation. Improved fermentation will improve the quality of the cocoa beans produced. This study aims to examine the effect of the use of yeast types and soaking time on the quality of cocoa beans. This research has been carried out in the laboratory of the Faculty of Agriculture UISU Medan using a factorial Completely Randomized Design (CRD), which consists of two factors, namely: Factor I type of yeast (R) consisting of 4 levels: R0 = Control; R1 = Bread Yeast; R2 = Tempeh Yeast and R3 = Tape Yeast. Factor II The immersion time (P) consists of 4 levels: P1 = 1 hour; P2 = 2 hours; P3 = 3 hours and P4 = 4 hours with 2 repetitions. Parameters observed were yield, pH, water content, fat content, and organoleptic test of taste and aroma. The data is analyzed using means of variance and if it had a significant effect, then continued with Duncan's Multiple Range Test (DMRT). The results of the study showed that the type of yeast had a significant effect on pH, water content, fat content, and organoleptic test values ​​for taste and aroma. Soaking time has significantly different effects on pH, fat content, and organoleptic test values ​​for taste and aroma. The interaction of the treatment the effect of yeast type and soaking time had no significant effect on all observed parameters. Fermentation of cocoa beans with the addition of yeast can improve the quality of cocoa beans, especially with the addition of baker's yeast and soaking time of 4 hours to produce the highest taste and aroma.
Nutrient Uptake and Chlorophyll of Long Bean Plants (Vigna Sinensis L.) Due to Liquid Waste Tofu and Planting Media: Serapan Hara Dan Klorofil Tanaman Kacang Panjang (Vigna Sinensis L.) Akibat Pemberian Limbah Cair Tahu Dan Media Tanam M. Idris; Rahmadina; Nindi Fauziah
Jurnal Online Pertanian Tropik Vol. 9 No. 3 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jopt.v9i3.10224

Abstract

This study aims to determine the absorption of nutrients N, P, total chlorophyll, and combination interactions due to the application of tofu liquid waste and growing media to long beans. The study used a factorial randomized block design (RBD) with 3 replications. Factor I of tofu liquid waste treatment (T) consisted of 3 levels, namely: T0 (0 ml), T1 (150 ml), T2 (300 ml ), and Factor II , Growing Media (M) consisted of 3 planting media, namely M1 (compost of cow dung + rice husk charcoal), M2 (compost of cow dung + cocopeat), and M3 (compost of cow dung + chopped fern). The observed variables included nutrient uptake of N-Total, P, and total chlorophyll content. The results showed that the treatment of tofu liquid waste had a very significant effect on N-Total and P nutrient uptake, namely 150 ml (T1) and the administration of 300 ml (T2) had a very significant effect on total chlorophyll content. The growing media had a very significant effect on nutrient uptake of N, P, and total chlorophyll content in the M3 treatment( cow manure compost + chopped fern). There was no interaction between tofu liquid waste and planting media for all observed variables
Effect of Yellow Sweet Potato Substitution and Egg Yolk Amount in Making Wet Noodles: - Paramuji, Muji; Wanbahroni Jiwar Barus; Miranti; Aprilawati Sitompul; Muhammad Nuh; Eka Ayutiningsih
Jurnal Online Pertanian Tropik Vol. 9 No. 3 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jopt.v9i3.10408

Abstract

Most of the noodles are made from wheat flour, for countries that do not produce wheat this is a problem because the need for wheat must be imported and generates a large amount of foreign exchange. This situation resulted in research involving the use of non-wheat flour or mixing wheat flour with other flour to produce noodles. This study aims to determine the effect of the substitution of wheat flour with yellow sweet potato and the amount of egg yolk in the manufacture of wet noodles. The study used a factorial completely randomized design (CRD), which consisted of two factors, namely: substitution of wheat flour with yellow sweet potato with the code "U" consisting of 4 levels; U1 = 10 %; U2 = 20 %; U3 = 30 %; U4 = 40 %. Egg yolk amount, and with code "T" which consists of 4 levels; T1 = 5 %, T2 = 10 %, T3 = 15 %, and T4 = 20 %. Parameters observed were yield, protein content, moisture content, stretchability, and organoleptic test of texture, color, and taste. The research was carried out at the UISU Faculty of Agriculture laboratory, Medan. The main ingredient used in this research is yellow sweet potato. The results of statistical analysis on each parameter concluded that the substitution of wheat flour with yellow sweet potato had a very significant effect (P<0.01) on the yield, protein content, water content, tensile strength value, organoleptic texture, color, and taste of noodles. Wet. The amount of yolk dose had a very significant effect (P<0.01) on protein content, moisture content, tensile strength value, organoleptic texture, color, and taste of wet noodles. The two treatment factors did not show any interaction. To produce wet noodles with the best quality, you can substitute up to 30% wheat flour with yellow sweet potato and use 20% egg yolk.
The Fruitghurt Formulations are Combination of Red Guava and Pineapple Juice by using the Encapsulation Method, as an Alternative Source of Vitamin C Dewi Restuana Sihombing; Connie Daniela
Jurnal Online Pertanian Tropik Vol. 9 No. 3 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jopt.v9i3.10470

Abstract

Fruitghurt is a product of fermented fruit juice using Lactobacillus bulgaricus and Streptococcus thermophillus bacteria. This research was conducted of developing fruitghurt products that contain vitamin C with a combination of red guava and pineapple juice. The research method was carried out using a factorial completely randomized design method which consisted of two factors. Factor I: combination of red guava and pineapple juice: JN1=120%:80%; JN2=130%:70%, JN3=140%:60%, JN4=150%:50%. Factor II: drying time L1=1 hour, L2=2 hours, L3=3 hours, L4=4 hours. The results showed that the concentration of red guava and pineapple juice had a very significant effect (p<0.01) on vitamin C levels, total dissolved solids, total acids, water content, total LAB, antioxidant activity, organoleptic. The interaction between the concentration of red guava and pineapple juice and the drying time had a very significant (p<0.01) effect on total lactic acid bacteria, antioxidant activity, vitamin C and total dissolved solids. The best fruitghurt quality was obtained in the JN4L1 treatment combination with a vitamin C 4.92 mg/100g, total dissolved solids 8.85°Brix, total acid 1.50%, moisture content 4.98% and total lactic acid bacteria 12.95 log CFU/ml. Fruitghurt a formulation of red guava and pineapple juice is recommended as an alternative source of vitamin C.

Page 33 of 38 | Total Record : 378

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