Balai Penelitian Tanah bekerja sama dengan Gent University Belgium menyelenggarakan Seminar Nasional Peningkatan Produktivitas Sayuran Dataran Tinggi berlangsung pada 17-18 Maret 2010, bertempat di Auditorium Ismunadji –Bogor.
Seminar dihadiri lebih kurang 120 peserta yang terdiri para peneliti dari berbagai instiusi antara lain: Balittanah, BBSDLP, Balitklimat, BPTP berbagai provinsi, Perguruan TInggi antara lain IPB, Unpad, UGM, Universitas Lampung, Universitas Satyawacana, Unibraw, Universitas Bengkulu, dan beberapa Dinas Pertanian Tingkat II dan mahasiswa.
Pada sidang pleno disampaikan makalah dari: BBSDLP (disampaikan oleh Dr. D. Subardja), Universitas Gent Prof. Dr. Stefaan De Neve), Balitsa, Balittanah (Dr. Sri Rochayati)
Seminar membahas 54 makalah berbagai topik seputar kesuburan tanah, keseimbangan hara, teknik budidaya tanaman, konservasi tanah, ketersediaan peta dan data tanah yang berkaitan dengan produktivitas tanaman sayuran dataran tinggi.
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Background
Vegetable farming system in Indonnesia is confronted with strong duality, it ranges from traditional low input to high input systems. Under traditional system, fertilizer application is (too) low, resulted in poor yield. Conversely, under high input farming system, fertilizer applied in excessive amount every planting season, especially N ( as high as 750 kg per ha and up to 40 ton per ha manure) combined with high use of pesticide. Both in traditional and high input system, the fertilizer use efficiency (especially of N) was low. Nitrate leached from vegetables farming will lead as a major sources of water pollution in down streams areas, and may effect a product quality. Obviously, this also effect a farm profitability.
Last Updated ( Friday, 19 March 2010 11:25 )
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Ladiyani R. Widowati, Stefaan de Neve, Diah Setyorini, Sukristiyonubowo, Fahmuddin Agus
FY 2007
Introduction
Nitrogen in soil is easily transformed from one chemical form to another through mineralization, nitrification, immobilisation, denitrification, and volatilisation processes, leading to nitrogen limitation in the soil (Barbarick, 2003). These transformations are affected by microbial activities, soil moisture content, and temperature. Input of nitrogen may come from fixation, deposition from the air, and fertilisers.
Materials and Methods
The experiment of nitrogen mineralization with incubation method was conducted at the Indonesian Soil Research Institute (ISRI) Laboratory in Bogor, Indonesia. There were two experiments namely 1) Unamended soil (soil without addition of organic matter, as control soil) and 2) Amended soil (soil with addition of organic matter). The bulk soil samples were taken from four locations of N-balance experiment, including Sumowono, Kopeng, Buntu Kejajar, and Argoyoso. At sampling time, all the sites were still in preparation. The soil condition, crop rotation, and fertilizer rates were considered in selecting the site for soil sampling. Samples of every location were taken from three farmers and replicated three times. Therefore, total unit incubations are 36 (4 locations x 3 farmers x 3 replications).
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Capacity building on FY 2008 covers training on composting, farmers’ meeting, mini sandwich of PhD program, visit of the ISRI scientist to Ghent University, training on the use of laboratory equipments, Indonesian student’s involvement in N balance research, and farmer to farmer transfer knowledge (sharing of farmer experiences).
3.1. Training on composting
Training on composting was organized in Punthuk Rejo Village, Karanganyar District from 25 August to 27 August 2008. I was attended about 50 participants representing farmer cooperators, non-cooperator farmers, extension workers, private company and researchers from ISRI (Indonesian Soil Researcher Institute). The training was opened by the Director of ISRI and the head of Ngargoyoso sub district. The participants stayed in the farmers’ house during the training. Detailed of the participants is presented in Table 3.1. The topics given during the training covered management of barn, natural agent, composting (theory and practice), soil and fertilizer test kits (theory and practice). Detailed materials of training, program and trainers were presented in Table 3.2 and Table 3.3. The theoretical aspects were conducted in the meeting room of village office and the practical seasons were in the Sumardjo site, one of the cooperator farmers.
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