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All Journal SC (Savana Cendana) : Jurnal Pertanian Konservasi Lahan Kering
Bregas Budianto
Departemen Geofisika dan Meteorologi, Institut Pertanian Bogor, Bogor, Indonesia.
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science

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Profil Cuaca dan Parameter Nisbah Bowen di Areal Persawahan Kabupaten Indramayu Saat Periode Kering Musim Tanam II Roberto I. C. O. Taolin; Impron Impron; Rini Hidayati; Bregas Budianto
Savana Cendana Vol 2 No 01 (2017): Savana Cendana (SC) - January 2017
Publisher : Fakultas Pertanian, Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (815.268 KB) | DOI: 10.32938/sc.v2i01.80

Abstract

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. 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 from 134.4 to 226.5 Wm-2 and the mean was 184 Wm-2.
Pendugaan Evapotranspirasi Padi Sawah Dengan Metode Nisbah Bowen Roberto I. C. O. Taolin; Impron Impron; Rini Hidayati; Bregas Budianto
Savana Cendana Vol 2 No 02 (2017): Savana Cendana (SC) - April 2017
Publisher : Fakultas Pertanian, Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (340.125 KB) | DOI: 10.32938/sc.v2i02.88

Abstract

The objectives of this experiment were to test the accuracy of the Bowen ratio method of predicting actual evapotranspiration value of paddy rice. The case study in Indramayu regency, held from June to September 2012. The weather components measured by the Bowen Nisbah system are net radiation, wet ball and dry ball temperature, wet ball gradient and the dry ball at altitudes between 140 cm and 160 cm and at altitudes between 160 cm and 180 cm and soil heat flux. Measurements every 30 minutes from 6.00 AM to 6.00 PM. The components measured by AWS are radiation, temperature, humidity, air pressure, rainfall, wind direction, and speed. The daily evapotranspiration value estimated with Bowen ratio was compared to the correspondent value obtained from FAO Penman-Monteith method using a paired t-test. Results shown the rice field daily evapotranspiration in Indramayu measured at a dry period during the second growing season estimated with Bowen ratio method was 3.3 mm, ranging from 2.4 to 4.3 mm. The corresponding values estimated with the FAO Penman-Monteith was 3.5 mm, ranged from 2.4 to 4.6 mm. The daily evapotranspiration values estimated with two approaches were comparable.
Co-Authors Impron Impron Rini Hidayati Roberto I. C. O. Taolin