https://talenta.usu.ac.id/jpt/issue/feed Jurnal Pertanian Tropik 2023-11-17T11:09:36+07:00 Benny Hidayat bendayat@gmail.com Open Journal Systems <p align="justify"><span class="" lang="en"><span class="">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) in 20 Articles</span></span></p> <p align="justify"><span class="" lang="en"><span class=""><span id="result_box" class="" lang="en">Since Vol. 6, No. 3 of 2019, Jurnal Pertanian Tropik Journal moved to the https://talenta.usu.ac.id/jpt/ page facilitated by Talenta Publisher, University of Sumatra Utara, Medan, in order to improve the governance of scientific publications in the Open Journal System (OJS ) </span></span></span><span class="" lang="en"><span class="">ISSN (Print/ Online): 2356-4725/ <a title="eISSN" href="http://u.lipi.go.id/1361782546">2655-7576</a></span></span></p> <p align="justify"><span class="" lang="en"><span class="">The journal of tropical agriculture has been accredited by the Ministry of Technology Research and Higher Education No. 21 / E / KPT / 2018</span></span></p> <p align="justify"> </p> https://talenta.usu.ac.id/jpt/article/view/9830 Growth, Yield and Efficiency of Nitrogen Fertilization of Shallots in Dosage of Nitrogen Fertilizer and Cow Manure 2023-01-09T10:48:49+07:00 MUHAMMAD JUWANDA MUHAMMAD JUWANDA muhammad.juwanda@gmail.com <p>This research was conducted to determine the effect of nitrogen fertilizer and cow manure on the growth, yield, and efficiency of shallot plant growth. This research was conducted in the rice fields of Brebes, Brebes Regency. This study is a factorial experiment using a randomized block design (RAK) with two factors. The first factor is the application of nitrogen fertilizer 1/3 N (Urea) + 2/3 N (ZA) which consists of 4 levels, namely 0 N kg/ha (N0); 100 N kg/ha (N1); 200 N kg/ha (N2) and 300 N kg/ha (N3). The second factor is the application of organic material of cow manure with 4 levels, namely 0 t/ha (K0); 10 t/ha (K1); 20 t/ha (K2) and 30 t/ha (K3). There were 16 treatments, each treatment was repeated three times. plant height, number of leaves, leaf area (g), number of tillers per plant, number of tubers per plant, fresh weight of plant per clump (g), weight of tuber per clump (g), dry weight of plant per clump (g), weight of tuber dry per clump (g), tuber volume per clump (mL), N uptake (g), fertilization efficiency N (%). Observational data were analyzed with the F test to determine the diversity and if there was a significant difference, proceed with DMRT with an error rate of 5%. The results showed that the administration of a nitrogen dose of 200 kg N/ha was able to increase the growth and yield of shallots compared to other treatments. The best efficiency of N fertilization was in the application of 100 kg N/ha nitrogen fertilizer.</p> 2023-11-08T00:00:00+07:00 Copyright (c) 2023 Jurnal Pertanian Tropik https://talenta.usu.ac.id/jpt/article/view/14397 Potential of Bio-Silica From Palm Oil Waste As a Rehabilitation of Dry Marginal Land on Corn (Zea mays L.) Planting 2023-11-17T11:09:36+07:00 Agris Soufri Laila agrissoufri@usu.ac.id Kemal Bakhtiar Rahman1 kemalbakhtiar@usu.ac.id Safira Azkia safiraazkia@usu.ac.id Muhammad Rafli muhammadrafli@usu.ac.id Wida Akasah widaakasah@usu.ac.id <p><em>Food estate</em> merupakan program unggulan pemerintah dalam mengatasi krisis pangan akibat Covid-19. Program ini menggunakan tanah ultisol yang memiliki kesuburan rendah karena memiliki pH dan silika yang rendah. Penelitian ini bertujuan untuk meningkatkan kesuburan tanah ultisol dengan pemberian pupuk biosilika dari limbah cangkang kelapa sawit agar meningkatkan produktivitas tanaman jagung (<em>Zea mays </em>L.). Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) dengan 5 taraf perlakuan dan 4 ulangan. Perlakuan pemberian pupuk biosilika sebanyak 0 g/<em>polybag</em>(S0) sebagai kontrol, 10 g/<em>polybag </em>(S1), 20 g/<em>polybag </em>(S2), 30 g/<em>polybag </em>(S3), dan 40 g/<em>polybag </em>(S4).&nbsp; Parameter yang diamati pada pupuk biosilika berupa uji FTIR, pada tanah ultisol berupa uji pH, P tersedia, Si tersedia, dan daya hantar listrik (DHL), sedangkan pada tanaman jagung meliputi tinggi tanaman, jumlah daun, bobot kering akar, bobot kering tajuk, dan serapan P. Data diolah menggunakan <em>software </em>IBM SPSS <em>Statistic </em>25 dan dianalisis menggunakan analisis keragaman (Anova) pada taraf uji 5%. Hasil penelitian menunjukkan bahwa limbah cangkang kelapa sawit mengandung silika sehingga dapat digunakan sebagai pupuk biosilika. Pemberian pupuk biosilika pada tanah ultisol mampu meningkatkan pH dan P tersedia sehingga meningkatkan serapan P dan pertumbuhan tanaman jagung. Perlakuan terbaik diperoleh pada perlakuan pemberian pupuk biosilika sebanyak 30 g/<em>polybag </em>(S3).</p> 2023-11-27T00:00:00+07:00 Copyright (c) 2023 Jurnal Pertanian Tropik