Bregas Budianto

IPB University

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Rizaldi Boer

IPB University

Shigeru Hashimoto

Hokkaido University

Muharam Syam Nugraha

Meteorological, Climatological, And Geophysical Agency

Masahide Nishihashi

National Institute for Environmental Studies

Nawa Suwedi

Indonesian Agency for Agricultural Research and Development

Eka Suharguniyawan

Badan Pusat Statistik

Yukio Terao

National Institute for Environmental Studies

Muhammad Ardiansyah

IPB University

Ronald Christian Wattimena

Meteorological, Climatological, And Geophysical Agency

Rudi Nugroho

National Research and Innovation Agency

Cooperative Institutions

IPB University

Meteorological, Climatological, And Geophysical Agency

National Research and Innovation Agency

National Institute for Environmental Studies

Badan Pengkajian dan Penerapan Teknologi

University of Indonesia

Institut Sains dan Teknologi Al-Kamal

Indonesian Agency for Agricultural Research and Development

Badan Pusat Statistik

Osaka University

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Evaluating the latex yield of rubber tree (Hevea brasiliensis muel arg.) based on the ages of the plant and the time of tapping

E3S Web of Conferences (2024)

Nourma Amalia Sugiarto Bregas Budianto Ade Astri Muliasari Hidayati Fatchur Rochmah Undang

The yield of latex is strongly influenced by the tapping time and age of the plant. This study was conducted to evaluate the yield of latex obtained from different times of tapping and the age of the plants. The observation was conducted on the 15 and 11-year-old PB260 rubber clones, which were tapped at three different times: 5 am, 6 am, and 7 am with ten plant samples for each plant age and tapping time, respectively. In total, 60 plant samples were collected. The 15-year rubber clone produced a higher latex yield than the 11-year-old rubber clone. The 15-year-old plant produced 47 ml, 25 ml, and 21 ml when tapped at 5 am, 6 am, and 7 am, respectively. The 11-year-old rubber clone produced 29 ml, 23 ml, and 15 ml when tapped at 5 am, 6 am, and 7 am, respectively. 5 am was the best tapping time to produce a higher latex yield in the PB260 rubber clone.

Tapping

Hevea

Tree (set theory)

10.1051/e3sconf/202457702010

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Chemical composition of atmospheric aerosols over Jakarta megacity

Japan Geoscience Union (2020)

Masahide Nishihashi Hitoshi Mukai Yukio Terao Shigeru Hashimoto Rizaldi Boer

Megacity

Atmospheric Composition

Asian Dust

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Development of air quality mobile tools for observation

IOP Conference Series Earth and Environmental Science (2021)

I T Hakim Bregas Budianto Gito Immanuel Afif Rakhman S A K W Kinasih

Abstract Mobile weather stations are needed because of their better coverage balance than stationary stations. Center for Climate Risk and Opportunity Management in Southeast Asia Pacific (CCROM-SEAP) of Bogor Agricultural University (Institut Pertanian Bogor or IPB University) developed a low-cost mini observation system using Espressif ESP32 DOIT Development Kit V1 module, which based on the internet of things (IoT) to monitor real-time meteorological elements (such as temperature, humidity, and pressure), CO 2 , PM 2.5 , and PM 10 concentration for Bogor (Center of Bogor City). With Firebase (database service by Google) integration, the system records data every 2 minutes and sent automatically to Firebase. We also create an unpublished android application called ServMo for exporting JSON to CSV format. The results show this system has a good performance for real-time monitoring purposes for a better balance of measurements coverage.

JSON

Android application

Weather station

10.1088/1755-1315/893/1/012071

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Weather Profile and Parameters of Bowen Ratio in the Indramayu Rice Field Area During the Dry Period Season of Planting II

Savana Cendana (2017)

Roberto I. C. O. Taolin Impron Impron Rini Hidayati Bregas Budianto

The objectives of this experiment were to study the weather profile and parameters of Bowen ratio in the Indramayu rice field area during a dry period season of planting II. Results showed that daily weather fluctuations and Bowen ratio parameters were in line with incoming net radiation of each element.n Temperature, dry bulb temperature gradient, wind speed, soil heat flux, and latent heat flux increased at midday and decreased in the early afternoon, whereas wet bulb temperature gradient, humidity, and air pressure were decreased at midday and increased at afternoon. Diurnal variation of net radiation ranged from -47 to 487 Wm-2 with the mean was 241 Wm-2. Mean, maximum and minimum temperatures were 28.3 of 31.5oC, and 20.5oC, respectively. Mean of relative humidity was 66% with the range was 52% to 80%, and mean of air pressure was 101 kPa. Soil heat flux ranged from 10.3 to 19.3 Wm-2 with the mean was 8.1 Wm-2. Mean and range of Bowen ratio were 0.16 and -0.76 to 0.65, accordingly. Mean and range of latent heat flux were 172.9 Wm-2 and -85.3 to 392.3 Wm-2. Surface incoming net radiation during the measurement period was constantly ranged from 183 to 268 Wm-2 with the mean was 231 Wm-2. Mean, maximum and minimum temperatures were 29.4 of 35.5oC, and 20oC, respectively. Mean of relative humidity was 59% with the range was 45% to 67%, and mean of air pressure was 101 kPa. Wind velocity was 0.9 ms-1 and its flow direction was mostly from the Southeast (138.4o). Soil heat flux was high at the end of measurement period; ranged from 4.7 to 14.6 Wm-2 with the mean was 7.9 Wm-2. Mean and range of Bowen ratio were 0.10 and 0.02 to 0.22, accordingly. Latent heat flux value was directly proportional to incoming net radiation, ranged fromnn 134.4 to 226.5 Wm-2 and the mean was 184 Wm-2. © 2017 published by Savana Cendana.

Bowen ratio

Diurnal temperature variation

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Dynamics of Intercepted Solar Radiation to Simulate Dry Matter of Soybean (Glycine Max (L.) Merrill)

Agromet (2017)

Pono Ngatui Handoko Handoko Bregas Budianto Marliana Tri Widyastuti

Solar radiation greatly affects the development of plant biomass. The process of plant development is complex. Here, we simplified this complexity through modeling experiment by integrating climate variables. This study aims to determine the dynamics of canopy intercepted solar radiation under soybean (Glycine Max (L.) Merrill). We employed the shierary-rice model to calculate plant biomass. The results showed that intercepted radiation continuosly increased during vegetative phase, whereas the radiation remains constant during generative phase. Our observation confirmed that the pattern of intercepted radiation followed the angular pattern of sunlight. The intercepted radiation was optimum at 10:00 to 14:00 pm, and it was used to form the plant dry matter. We found that the intercepted radiation contributed until 12%. Based on this contribution, we built our crop model of soybean biomass. Our model performed well in simulating dry biomass with high R2 (0.9), and as indicated by the plot 1:1 between dry matter of model and field observations. Further, the result of t test between model and observed data confirm this strong corelation (p-value 0.07).

10.29244/j.agromet.31.1.43-52

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Water Demand Analysis of Sugarcane Based on Crop Simulation Model (Case Study: Kediri Regency, East Java)

Agromet (2019)

Astrid Yusara Handoko Handoko Bregas Budianto

Sugarcane productivity is naturally affected by climate variables and limited by the water availability. This study simulated a water balance model to estimate sugarcane water requirement and to estimate the best planting time as well based on its optimum productivity in Kediri Regency. Water requirement was estimated by water loss of evapotranspiration following FAO No. 24, while the productivity was based on mid-maturing sugarcane growth and development. Sugarcane rainfed area in Kediri Regency needs approximately 26-128 mm water per month based on its loss by evapotranspiration. The value varied due to the growth phase. More than 60% water was used in vegetative phase for developing buds and stem elongation of about 3-9 months after planting. The highest sugarcane productivity was obtained in July-September as the best planting time shown by simulation. Moreover, water deficiency during mid-season of sugarcane growth could decrease productivity by a significant amount. The work presented here could be used as a tool to help decision makers for irrigation management and select the best planting date.

Water balance

Cane

10.29244/j.agromet.33.1.30-40

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Pendugaan Evapotranspirasi Padi Sawah Dengan Metode Nisbah Bowen

Savana Cendana (2017)

Roberto I. C. O. Taolin Impron Impron Rini Hidayati Bregas Budianto

Penelitian ini bertujuan untuk menduga nilai evapotranspirasi dengan metode Nisbah Bowen di lahan sawah. Studi kasus di Kabupaten Indramayu, dilaksanakan bulan Juni hingga September 2012. Komponen cuaca yang diukur dengan sistem Nisbah Bowen adalah radiasi neto, suhu bola basah dan bola kering, gradien suhu bola basah dan bola kering pada ketinggian antara 140 cm dan 160 cm serta pada ketinggian antara 160 cm dan 180 cm dan limpahan bahang tanah. Pengukuran setiap 30 menit mulai pukul 06.00 sampai pukul 18.00 Komponen yang diukur dengan AWS adalah radiasi, suhu, kelembaban, tekanan udara, curah hujan, arah dan kecepatan angin. Perhitungan dengan metode Nisbah Bowen kemudian dibandingkan dengan perhitungan menggunakan metode FAO Penman-Monteith. Hubungan evapotranspirasi harian hasil perhitungan dengan dua metode tersebut dianalisis dengan Korelasi (Pearson Correlation). Hasil penelitian menunjukkan evapotranspirasi harian di areal persawahan Kabupaten Indramayu pada saat periode kekeringan musim tanam II yang diduga menggunakan metode Nisbah Bowen berkisar antara antara 2,4 mm sampai 4,3 mm dengan rata-rata 3,3 mm, sedangkan evapotranspirasi harian yang diduga menggunakan metode FAO Penman-Monteith bervariasi antara 2,4 mm sampai 4,6 mm dengan rata-rata 3,5 mm. Rata-rata hasil estimasi evapotranspirasi harian dari kedua metode secara statistik tidak berbeda nyata. ©2017 dipublikasikan oleh Savana Cendana.

10.32938/sc.v2i02.88

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Mini Power Station

Bregas Budianto Edyanto Edyanto Resti Salmayenti Dewi Sulistyowati Wibawa Furqona

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Greenhouse gases and air pollutants monitoring project around Jakarta megacity

IOP Conference Series Earth and Environmental Science (2019)

Masahide Nishihashi Hiroyuki Mukai Yukio Terao Shigeru Hashimoto Yumi Osonoi

Abstract National Institute for Environmental Studies (NIES) has been implementing a joint monitoring project of greenhouse gases (GHGs) and air pollutants in Indonesia with Bogor Agricultural University (IPB), Agency for the Assessment and Application of Technology (BPPT), and Meteorological, Climatological, and Geophysical Agency (BMKG). To estimate the amount of anthropogenic emissions from Jakarta megacity (Jabodetabek) and compare with city activities, we developed a ground-based comprehensive monitoring system of GHGs and air pollutants and installed it at Bogor (center of Bogor city) in March 2016, Serpong (Jakarta suburb) in August 2016, and Cibeureum (mountainous area, background-like site) in March 2017. The monitoring system consists of data acquisition/control units and the instruments for continuous measurements of CO 2 , CH 4 , CO, NO x , SO 2 , O 3 , aerosol concentrations (PM 2.5 , PM 10 , BC) and the chemical components, and meteorological parameters. Flask sampling of air is also done to analyze N 2 O, SF 6 , and carbon isotopes ( 13 C, 14 C) in CO 2 and to validate the continuous measurement data. The result shows that CO 2 mole fractions observed at three sites have clear diurnal variations representing the minimum values from 12 to 15 local time while the values at Bogor and Serpong are 6.8 and 7.1 ppm higher than Cibeureum, respectively.

Megacity

Criteria air contaminants

Air monitoring

10.1088/1755-1315/303/1/012038

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The Role of Vegetation in Reducing Anthropogenic CO2 in Bogor City

Agromet (2018)

Ariesta Kusuma Wardhani Bregas Budianto Yon Sugiarto

Vegetation has a role in reducing CO2 from anthropogenic activities through photosynthesis. Fuel combustion is one of the activities that greatly contribute to CO2 emissions. As a city with many destinations, the possibility of CO2 emissions will increase in Bogor especially on holidays because of motorized vehicle from other cities. This research aims to determine the absorption capability of vegetation in Bogor City in reducing CO2 emitted from fuel combustion. We analyzed CO2 data for 2017 by day to obtain traffic levels in the city assuming that people mobility using vehicle was influenced by day. Then we separated CO2 data into slow and fast photosynthesis rate based on air temperature. We determined the absorption capability of vegetation at daily basis by calculating the difference between the min and the max of CO2 concentration divided by the min of CO2. Our results showed that the lowest CO2 level was in Sunday. On that day, the average air temperatur was high indicating the less CO2 concentration. Our one-way Anova test confirmed this finding. The finding revealed that the absorption capability of vegetation to reduce anthropogenic CO2 was still limited. To implement Bogor as green city, more vegetations and gardens are needed to balance an increased CO2.

10.29244/j.agromet.32.1.42-50

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Citations (3)