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Agromet

agromet
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Published by Institut Pertanian Bogor

ISSN : 01263633 EISSN : 2655660X DOI : -

Core Subject : Agriculture,

Agriculture, Biological Sciences & Forestry

Agromet publishes original research articles or reviews that have not been published elsewhere. The scope of publication includes agricultural meteorology/climatology (the relationships between a wide range of agriculture and meteorology/climatology aspects). Articles related to meteorology/climatology and environment (pollution and atmospheric conditions) may be selectively accepted for publication. This journal is published twice a year by Indonesian Association of Agricultural Meteorology (PERHIMPI) in collaboration with Department of Geophysics and Meteorology, Faculty of Mathematics and Natural Sciences, IPB University.

Arjuna Subject : -

Articles 7 Documents

Search results for , issue "Vol. 23 No. 1 (2009): June 2009" : 7 Documents clear

CLIMATE PROJECTION OVER INDONESIA BASED ON THE TOTAL FOSSIL FUEL CO2 EMISSION PREDICTION USING THE BOX-JENKINS ARIMA MODEL (PROYEKSI IKLIM WILAYAH INDONESIA BERDASARKAN PRAKIRAAN EMISI CO2 DARI PENGGUNAAN BAHAN BAKAR FOSIL MENGGUNAKAN MODEL ... Eddy Hermawan
Agromet Vol. 23 No. 1 (2009): June 2009
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

This paper mainly discusses about the development of estimation models raising the rate of gas emissions of carbon dioxide (CO2) as the main parameters of global warming in Indonesia. This is important to remember not many comprehensive scientific study which shows that the impact of global warming has actually experienced by Indonesia. Using Box-Jenkins method and the stage of identification, assessment, and testing, then the best prediction model obtained for the above data, the model of ARIMA (8,1,3). This means that the predicted value for the next year depending on the data before and 8 years 3 years earlier error. In the validation data with predicted results, the MAD (Mean Absolute Deviation) is relatively high. However, the pattern of results followed the pattern predicted almost the original data with a correlation value of 99%. Based on this result, we can estimate the climate projection over Indonesia, especially during 2012-2014.

ANALISIS HUBUNGAN CURAH HUJAN DENGAN KEJADIAN BANJIR DAN KEKERINGAN PADA WILAYAH DENGAN SISTIM USAHATANI BERBASIS PADI DI PROPINSI JAWA BARAT (ANALYSIS OF RELATIONSHIP BETWEEN RAINFALL AND FLOOD AS WELL AS DROUGHT EVENTS ON AREA WITH RICE ... Woro Estiningtyas; Rizaldi Boer; Agus Buono
Agromet Vol. 23 No. 1 (2009): June 2009
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

There are significantly decreasing of rainfall in wet season and dry season, and changed in onset of early season, that all of them can make crouded in plan of planting date, field actifity especially for food crops africulture. In the other side, climate is one of condition that has been ready and can not change, where probability of climate change will be reality that should be happened every time. Increasing frequency of climate extrem will give high impact in agriculture, especialy in rice-based farming system. This paper describes the climate risk based on statistical approaches. The climate risk is focused on flood and drought event. The analysis used was a chance occurrence based on time series data of rainfall and flood/droughts (affected and puso) based on median value from time series data. The goal of this research are : (1) to know rainfall critical value that can be influence flood and drought event in some of central food crops i West Java, (2) to know probability of flood and drought event in some of central food crops in West Java. The result of this research show that critical value of the rainfall that can be influence flood and drought event is very variety. Average of for flood event for paddy field near coastal based on median approach is 140 mm/month with probability 0,6. For another location, 166 mm/month with probability 0,68. Average of critical value of the rainfall for drought event is 64 mm/month for paddy field near coastal with probability 0,73. For another location, critical rainfall value is 119 mm/month with probability 0,76. For spesific research or detail scale (district or sub distric) we can use rainfall critical value and probablity based on data in that specific location because the data is more representative local riil condition.

PENGUKURAN KANDUNGAN AIR TANAH PADA PERTANAMAN JARAK PAGAR (JATROPHA CURCAS L.) SOIL WATER CONTENT MEASUREMENT UNDER JATROPHA CROP (JATROPHA CURCAS L.) Gusti Rusmayadi; Bregas Budianto
Agromet Vol. 23 No. 1 (2009): June 2009
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Management strategies development for efficient water utilization of crop production requires sensitive measurements of changes in soil water content on a dynamic basis. Many of the methods currently used for measuring these changes are destructive, slow, or relatively expensive for large-scale investigations. A sensor that low-cost, nondestructive soil moisture sensor for measuring changes in soil volumetric water content on the basis of changes in the dielectric constant of the soil water were available. So, this research was carried out to quantify soil water content on Jatropha under rainfall condition, four levels of nitrogen fertilizer (N) and two population densities (P). The experiments used a systematic Nelder fan design with 9 spokes and 4 rings were conducted at SEAMEO-BIOTROP field experiment in 2007. Based on evaluation this instrument can use to measurement soil water content in various environment.

CHANGE IN SPATIAL AND TEMPORAL CHARACTERISTICS OF RAINFALL IN EAST JAVA PROVINCE IN RELATION TO GLOBAL CLIMATE CHANGE PERUBAHAN KARAKTERISTIK CURAH HUJAN MENURUT RUANG DAN WAKTU DI PROVINSI JAWA TIMUR DALAM KAITANNYA DENGAN PERUBAHAN IKLIM ... Moh. Ismail Wahab; S. Sudibyakto; Sunarto Gunadi; W.S. Suratman
Agromet Vol. 23 No. 1 (2009): June 2009
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

This study aims to analyze spatial and temporal variation of rainfall in the year 1971 until the year 2007 that is divided into two (2) periods ie 1971-1989 and 1990-2007 in relat ion to climate global change. The research was conducted in the area of East Java province from July until December 2008. The secondary data used in the research were: 1) Rainfall monthly data from 106 stations located in East Java within the period of 1971-2007 obtained from the Agency for Meteorology and Geophysical Karangploso Malang, 2) Sea Surface Temperature Nino 3.4 (http ://www.cpc.ncep.noaa.gov.), 3) Soil map scale 1: 250,000 obtanined from the Center Institute for Environmental Resource Management of Agriculture, and the map of Agroecological Zone (AEZ) of East Java scale 1: 250,000 from Assessment Institute for Agricultural Technology East Java. The analysis of rainfall characteristic consists of a) the changes of climate type Oldeman, b) the changes of the early dry and rainy season, c) the changes in of rainfall amount in dry and rainy season. The results showed that in 1971-1989 periods, the type of Oldeman climate in East Java vary from B1 to E, but after the 1990s the type of Oldeman climate change varied from C1 to D4 meaning that a part of East Java area (16.7%) become drier and 17.8% area of East Java became wet. The analysis of rainfall stations (106 stations) showed that some of rainfall stations (58.49%) have decreased the number of dry season rainfall about 3 - 500 mm/season. 56 stations (52.8%) have increased the number of rainy season rainfall in the range 1-600 mm /rainy season, while the 49 rainfall stations (46.22%) have decreased the number of rainfall in the range of 1-500 mm/season. Changes in the characteristics of rainfall in East Java, which occurred within the period of 1971-1989 and 1990-2007 was caused by the ENSO phenomenon.

PEMODELAN DAN SIMULASI PRODUKTIVITAS PERKEBUNAN KELAPA SAWIT BERDASARKAN KUALITAS LAHAN DAN IKLIM MENGGUNAKAN JARINGAN SYARAF TIRUAN MODELING AND SIMULATION OF PALM OIL PLANTATION PRODUCTIVITY BASED ON LAND QUALITY AND CLIMATE USING ... H. Hermantoro
Agromet Vol. 23 No. 1 (2009): June 2009
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Crop growth and production on particular land and climate is strongly influenced by the interaction between plants, climate, soil, and management. Land quality and climate greatly affect the expected production of oil palm are: soil type, soil depth, altitude, soil pH, rainfall / year, average temperature, water deficit in mm / yr, air humidity, and solar radiation. Oil palm production as a function of land quality and climate can be predicted using various methods. Artificial Neural Network (ANN) is one recognized method for predict land productivity. In this study ANN Back propagation algorithm is used. The aim of this research is to develop ANN model and simulation of Oil Palm Plantation Productivity. Through the optimization procedure obtained the best ANN architecture is 11 neurons in input layer - 3 neurons in the hidden layer and - 1 neuron in the output layer, at 30,000 iterations of training step obtained the best model of oil palm productivity prediction with a value of R2: 0.98 and RMSE: 0:49, while from the test step obtains the value of R2: 0.94 and RMSE: 1.63. The results of simulation show that the simultaneous influence of several climatic changes that decrease the quantity of rainfall 100 mm / yr, 1 0C temperature rise, and increasing water deficit 50 mm / yr reduce the productivity of oil palm plantations for 2.15 tons / ha / year. From this research can be concluded that ANN can be used to predict the production of palm oil based on quality of land and local climate with very good results.

EFEK PENGEMBANGAN PERKOTAAN TERHADAP KENAIKAN SUHU UDARA DI WILAYAH DKI JAKARTA URBAN DEVELOPMENT EFFECT TO AIR TEMPERATURE IN JAKARTA AREA Ali Mas’at
Agromet Vol. 23 No. 1 (2009): June 2009
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

The purpose of this research is to know the amount of air temperature increase as a negative effect of city development in DKI Jakarta region. The method is to differentiate air temperature in urban areas (Meteorology station in Kemayoran-BMKG) towards sub urban areas (Meteorology station in Halim P.K. and Cengkareng). The result of this research shows that during the last of 28 years, average air temperature has increased 0.17 oC in Jakarta which tends to be 0,8 oC higher than those of sub urban areas.

ANALISIS DERET WAKTU CURAH HUJAN UNTUK MENGKAJI PERUBAHAN IKLIM DI DAERAH TANGKAPAN AIR PROPINSI LAMPUNG TIME SERIES ANALYSIS OF RAINFALL TO STUDY CLIMATE CHANGE IN WATERSHED AREA, LAMPUNG PROVINCE Tumiar Katarina Manik
Agromet Vol. 23 No. 1 (2009): June 2009
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

One important climate factor for tropical area is rainfall. Changes in rainfall pattern will cause numerous problems especially in agricultural activities. Rainfall pattern could also lead to either flood or drought; problems which will not only affect agricultural activities but also socio-economic situation of broad community. Therefore, study of local climate variability focusing on rainfall related to the global warming is important. Time series analysis ( correlogram and periodogram) of daily rainfall was chosen to investigate the phenomena of global warming in local scale. Data (1974-2004) was collected from Sumberjaya, Air Hitam and Fajar Bulan; three stations located inside one of the important watershed in Lampung Province. From the collelogram, in general daily rainfall in this upland and forest area shows independency up to the year of 1990. No seasonal pattern could be an indicator that rains in this area are controlled more by local topography and land cover condition then by larger scale of climate system such as monsoon. After 1990 there were some weak sign of seasonal pattern. This could be interpreted as a sign that larger climate system started influence the local rainfall and as the global warming increases, it could be predicted that local rainfall pattern will be controlled more by the larger climate system. The periodogram shows that rainfall in this area has weak annual periodic. Data from Sumberjaya on 1990-1994 and 1999-2006 showed that annual periodic were getting stronger; a sign that larger climate system started dominating the area.

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