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Drought Events in Western Part of Timor Island Indonesia Image
Journal article

Drought Events in Western Part of Timor Island Indonesia

Analysis of Crop Water Requirement for Maize with Planting Hole System Under Dry Climate Condition Image
Analysis of Crop Water Requirement for Maize with Planting Hole System Under Dry Climate Condition Image

Analysis of Crop Water Requirement for Maize with Planting Hole System Under Dry Climate Condition

Season Onset Prediction Based on Statistical Model for Malang Regency, East Java Image
Season Onset Prediction Based on Statistical Model for Malang Regency, East Java Image

Season Onset Prediction Based on Statistical Model for Malang Regency, East Java

Bogor Water Adequacy Status for 2009\u002D2019 Image
Bogor Water Adequacy Status for 2009\u002D2019 Image

Bogor Water Adequacy Status for 2009-2019

Land Use Change Impact on Normalized Difference Vegetation Index, Surface Albedo, and Heat Fluxes in Jambi Province: Implications to Rainfall Image
Land Use Change Impact on Normalized Difference Vegetation Index, Surface Albedo, and Heat Fluxes in Jambi Province: Implications to Rainfall Image

Land Use Change Impact on Normalized Difference Vegetation Index, Surface Albedo, and Heat Fluxes in Jambi Province: Implications to Rainfall

Influence of El Niño 2015/2016 on Climate Variability and Production of Main Crops in Langkat Regency Image
Journal article

Influence of El Niño 2015/2016 on Climate Variability and Production of Main Crops in Langkat Regency

Potential of Sorghum Varieties as Biofuel Image
Journal article

Potential of Sorghum Varieties as Biofuel

Influence of El Niño 2015/2016 on Climate Variability and Production of Main Crops in Langkat Regency Image
Influence of El Niño 2015/2016 on Climate Variability and Production of Main Crops in Langkat Regency Image
Journal article

Influence of El Niño 2015/2016 on Climate Variability and Production of Main Crops in Langkat Regency

Potential of Sorghum Varieties as Biofuel Image
Potential of Sorghum Varieties as Biofuel Image
Journal article

Potential of Sorghum Varieties as Biofuel

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Karakteristik Badai Tropis Dan Dampaknya Terhadap Anomali Hujan Di Indonesia(tropical Cyclone Characteristic and Its Impact on Rainfall Anomaly in Indonesia) Image
Journal article

Karakteristik Badai Tropis Dan Dampaknya Terhadap Anomali Hujan Di Indonesia(tropical Cyclone Characteristic and Its Impact on Rainfall Anomaly in Indonesia)

Tropical cyclone never reached Indonesia area but its impact able to cause disaster to this country. Some research indicated effect of tropical cyclone due to high intensity the rain in short duration in some location but drought in another. Tropical cyclone often followed by small scale tornado callled 'puting beliung' that cause local or regional damage. This research purpose to analyze physical characteristics of tropical cyclone at period January-March 2004 in south Hindia Sea. The Fay is a strong tropical cyclone has increase rainfall until 32 ms-1 and rainfaal on 47% Java station rainfall. On the other hand, The Ken is a weak tropical cyclone only cause higher wind speed and rainfall are 8 ms-1 and 18% Java station rainfall, respectively.------------------------------------------------------------------------Meskipun siklon tropis tidak pernah terjadi di Indonesia namun dampaknya sering berpengaruh terhadap Indonesia. Hasil berbagai penelitian menunjukkan bahwa siklon tropis menyebabkan hujan intensitas yang tinggi dalam waktu singkat pada suatu wilayah, dan juga menyebabkan kekeringan di daerah lain. Siklon tropis sering diikuti terjadinya puting beliung dengan daya rusak bersifat lokal hingga regional. Penelitian ini bertujuan untuk menganalisis karakteristik fisik siklon tropis di Samudera Hindia bagian selatan pada periode puncak terjadinya siklon yakni, Januari-Maret 2004. Analisis dilakukan terhadap dua siklon yang terjadi pada periode pengamatan yaitu siklon Fay (siklon kuat) dan siklon Ken (siklon lemah). Dampak siklon Fay terhadap peningkatan kecepatan angin menjadi 32 ms-1 dan peningkatan hujan yang signifikan padak 47% stasiun hujan di Jawa. Sedangkan siklon Ken hanya menyebabkan kecepatan angin meningkat sebesar 8 ms-1 dan peningkatan hujan pada 8% stasiun hujan di pulau Jawa.
Koefisien Pemadaman Tajuk dan Efisiensi Penggunaan Radiasi Surya pada Tanaman Kentang (Solanum Tuberosum L.) Varietas Granola di Galudra, Cianjur, Jawa Baratcanopy Extinction Coefficient And Solar Radiation Use Efficiency... Image
Journal article

Koefisien Pemadaman Tajuk dan Efisiensi Penggunaan Radiasi Surya pada Tanaman Kentang (Solanum Tuberosum L.) Varietas Granola di Galudra, Cianjur, Jawa Baratcanopy Extinction Coefficient And Solar Radiation Use Efficiency...

Important climatic factor affecting growth of potato crop other than temperature is the availability of solar energi. Growth of the crop can be predicted from the amount of intercepted solar radiation by crop canopy, however, climatological station only measures incoming solar radiation above crop canopy (Qo). This experiment aims to derive parameter of canopy extinction coefficient (k) that is required to calculate intercepted radiation based on Qo; and parameter of radiation-use efficiency (ε) to calculate crop biomass based on that intercepted radiation. This research found the value of k increasing from k=0.15 to k=0.50 associated with increasing LAI from 0.98 to 1.98. Solar radiation use efficiencies that were calculated based on above-ground biomass (AGB) and total biomass (AGB+tuber) are respectly εand εTotal=4,49 g MJ-1. Important climatic factor affecting growth of potato crop other than temperature is the availability of solar energi. Growth of the crop can be predicted from the amount of intercepted solar radiation by crop canopy, however, climatological station only measures incoming solar radiation above crop canopy (Qo). This experiment aims to derive parameter of canopy extinction coefficient (k) that is required to calculate intercepted radiation based on Qo; and parameter of radiation-use efficiency (ε) to calculate crop biomass based on that intercepted radiation. This research found the value of k increasing from k=0.15 to k=0.50 associated with increasing LAI from 0.98 to 1.98. Solar radiation use efficiencies that were calculated based on above-ground biomass (AGB) and total biomass (AGB+tuber) are respectly εand εTotal=4,49 g MJ-1.
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