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All Journal Journal of Tropical Soils Indonesian Journal of Agricultural Science Jurnal Sumberdaya Lahan
Sofyan Ritung
Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Environmental Science

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Rice Field Necessity to Sufficient Production of Food Material RITUNG, SOFYAN
Jurnal Sumberdaya Lahan Vol 4, No 01 (2010): Juli 2010
Publisher : Indonesian Center for Agriculture Land Resource Development

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Abstract

Indonesian population from year to year increasing, with growth of about 1.5%/year, thus pushing food demands continues to increase. Particularly agricultural land especially rice field, covering an area in 2005 reached 7.89 million hectares was not able to meet the food needs of Indonesia, so that needs to be supplemented by imports which in the last decade it has increased. The need for food began to increase and in the year 2020 deficit is estimated to occur if there is no additional production of 1.1 million tons of rice or equivalent to 1.8 million tons of GKG. In 2050 demand for rice will reach 48.2 million tons, an increase of 145%. Commodity corn and soybeans are expected to occured a deficit each of 2.2 million tons and 2.5 million tons in 2050. To sufficient the necessity of food until the year 2050, assuming that the conversion of rice land could be reduced to 60,000hectares/year, required the new rice fields of about 1,6-2,4 million hectares in 2020 and the cumulative area until the year 2050 is 6.0 million hectares.The potential availability of land for extensification of rice field in Indonesia is 8.28 million hectares, consists of 2.98 million hectares swamp rice field and 5.30 million hectares of non swamp rice field. The largest potential development are in Papua, Kalimantan, and Sumatra, each of 5.19 million hectares, 1.39 million hectares, and 0.96 million hectares. Rice field extensification strategies can be done through land use potential rice fields in the irrigation areas, abandoned rice field optimization in the tidal swamp and inland swamp, and extensification of rice field region scale in area large potential like Papua and Kalimantan.
ALTERNATIVE TREE CROPS FOR RECONSTRUCTION OF THE GREEN INFRASTRUCTURE POST-TSUNAMI IN THE COASTAL AREAS OF ACEH BARAT DISTRICT Wahyunto, Wahyunto; Ritung, Sofyan; Wahdini, Wahyu; Agus, Fahmuddin
Indonesian Journal of Agricultural Science Vol 10, No 1 (2009): April 2009
Publisher : Indonesian Agency for Agricultural Research and Development - MOA

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Tree farming such as coconut, cocoa, coffee, rubber, and rambutan was dominant in the west coast of Aceh prior to tsunami. The farming is not only important for sustainable livelihood, but also for superior environmental protection. During the tsunami, considerable portion of this ‘green infrastructure’ was devastated. Therefore, a scientifically based land suitability evaluation is needed for supporting the redesign and  reconstruction of the tree-based farming. The objectives of this research were to evaluate the current physical condition of the area and developrecommendation of land suitability for tree crops farming in the area. Field survey for inventory and evaluation of land characteristics was conducted in 2006, 15 months after the tsunami. Land suitability evaluation was conducted by matching field survey data and soil sample analyses in every mapping unit with crop growth requirements. The land suitability map wasfurther matched with the district development plan, existing land uses and land status. The resulted land use recommendation map showed that the marine ecosystem along the coastal line was most suitable for coconut, cacao, coffee, and casuarinas. The recommended tree crops for the ancient sandy beach were areca nut, coconut, rambutan, mango, rubber and oil palm; and for the alluvial ecosystem were coconut, cacao, areca nut, mango, and bread fruit. Peatland of less than 3 m thick was marginally suitable for oil palm and rubber, while those thicker than 3 m were recommended for conservation due to its fragile ecosystem. In the undulating tectonic plain, the suitable tree crops were rubber, oil palm, coconut, and rambutan.
Plot Scale Phosphorous and Potassium Balances of Newly Opened Wetland Rice Farming Originated from Wetland Sukristiyonubowo, .; Nugroho, Kusumo; Ritung, Sofyan
JOURNAL OF TROPICAL SOILS Vol. 17 No. 3: September 2012
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2012.v17i3.227-237

Abstract

Development of newly opened wetland rice fields both from dry land and wetland in Indonesia are important to meetrice growing demand, increase soil productivity, keep rural food security and provide jobs as well as generateincome. Most soils of newly opened rice fields are low in P and K contents, but the farmers do not apply P and Krecommended fertilisers. The study was conducted on newly opened wetland rice farming in Panca Agung village,Bulungan District, East Kalimantan Province, Indonesia in 2009. The aims were to evaluate phosphorous andpotassium input – out of newly opened wetland rice and to validate the P and K recommendation. Six treatmentswere tested including farmers practices (as control), farmer practices + straw compost + dolomite, NPK withrecommendation rate in which N and K was split in two applications, NPK with recommendation rate in which N andK was split three applications, NPK with recommendation rate + straw compost + Dolomite , in which N and K wassplit three applications, and NPK with recommendation rate + straw compost + dolomite, in which N and K weresplit two applications. The N, P and K rates were 250 kg urea, 100 kg SP-36 and 100 kg KCl ha-1 season-1, while thefarmer practices 100 kg urea and 100 kg SP-36 ha-1 season-1. Parameters to be measured were concentration P andK in mineral fertilizer, compost, irrigation water and grains as well as straw. The results showed that surplus Pranged from 5.75 to 12.85 kg P ha-1 season-1, meaning that SP-36 application rate was more than enough to replace Premoved by harvest product. In contrast, potassium application rate should be increased from 100 to 200 kg KClha-1 season-1 to fix K removed by harvest product. However, when the compost will also be increased to 3 Mg ha-1season-1 K fertilizer can be increased to 150 kg KCl ha-1 season-1 to substitute K taken away by rice harvest productand to keep higher rice grain yield. These P and K recommendation rate imply that total SP-36 and KCl should beavailable at district level will be about 984.9 Mg SP-36 and 1.477 Mg KCl district -1 season -1, respectively.Keywords: Newly opened wetland rice; nutrient balance; nutrient input; nutrient losses; plot scale wetland[How to Cite: Sukristiyonubowo, K Nugroho and S Ritung. 2012. Plot Scale Phosphorous and Potassium Balances of Newly Opened Wetland Rice Farming Originated from Wetland. J Trop Soils 17 (3): 227-237. doi: 10.5400/jts.2012.17.3.227][Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.227] 
Co-Authors . SUKRISTIYONUBOWO Fahmuddin Agus Kusumo Nugroho Wahyu Wahdini Wahyunto Wahyunto