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All Journal Jurnal Ilmu Pertanian Indonesia Agromet Media Kesehatan Masyarakat Indonesia Jurnal Agro

Handoko Handoko

IPB University

Author-ID : 2450319

Agriculture, Biological Sciences & Forestry Public Health

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PENDUGAAN DEFISIT AIR TANAMAN JARAK (RICINUS COMMUNIS L) BERDASARKAN MODEL SIMULASI DINAMIKA AIR TANAH(PREDICTION WATER DEFICIT OF CASTOR OIL (RICINUS COMMUNIS L) WITH DYNAMIC SOIL-WATER MODEL SIMULATION) F. Djufri; A. Yanto; . Handoko; Yonny Koesmaryono
Agromet Vol. 19 No. 2 (2005): December 2005
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Construction dynamic model soil – water that describes relationships between crop growth and development and environmental factors (weather and soil) can be further developed to be employed as a decision support tool . The objectives of the research : (1) to know interaction of factor weather , soil, castor oil crop, (2) construction dynamic model soil – water , (3) monitoring water deficit factor at level of water irrigation. The research consisted field observation and construction model. The experimental results were used to determine quantitative relationships to obtain model parameters, calibration, and validation. This research was conducted in field experimental station of Balitpa Sukamandi, and it was arranged in split plot design with three replications. Two variety of castor oil as main plot design were : (1) ASB 81, (2) ASB 60. Three levels of water irrigation as sub plot design were : (1) No water irrigation, (2) ½ ETp, (3) 1 ETp. Field measurements included weather variables, soil, and crop. The t-test does not indicate significant difference between observed and predicted soil water content. The model is valid and reasonably well for predicting soil water content as long as castor growth . The dynamic model soil-water can be employed as a decision support tool in the management of castor oil plantations in Indonesia.

EFISIENSI PENGGUNAAN RADIASI SURYA DAN SEBAGAI DASAR DALAM MODEL JARAK PAGAR(RADIATION USE EFFICIENCY AS BASIS THE CROPS MODELING OF JATROPHA) Gusti Rusmayadi; . Handoko; Yonny Koesmaryono; Didiek Hadjar Goenadi
Agromet Vol. 22 No. 2 (2008): December 2008
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Plant growth interpretation in term of accumulated intercepted solar radiation and the radiation use efficiency (RUE) was used to study the growth and analysis of Jatropha (Jatropha curcas L.). A number of crop growth simulation models have been developed using the RUE concept to predict crop growth and yield in various environments. These models generally calculate daily biomass production as the product of the quantity of radiation intercepted and RUE. This research was carried out to quantify the RUE, biomass and leaf area index on Jatropha under rainfall condition, four levels of nitrogen fertilizer (N) and three population densities (P) planted twice. The experiments used a systematic Nelder fan design with 9 spokes and 4 – 5 rings were conducted at SEAMEO-BIOTROP field experiment in 2007. Data from the first experiment were used for parameterization and calibration and the second experiment data for model validation. Values of RUE were determined by nitrogen fertilizer and plant density. Based on parameterization, we found that RUE for prediction above ground biomass accumulation of Jatropha were 0.94 (r=0.83) g MJ-1 to 1.3 (r=0.75) g MJ-1. Validation between model prediction and field experimental data showed that model can simulate crop growth and development of Jatropha.

PEMODELAN TANAMAN JARAK PAGAR (JATROPHA CURCAS L.) BERBASIS EFISIENSI PENGGUNAAN RADIASI SURYA,KETERSEDIAAN AIR DAN NITROGEN(CROP MODELING OF JARAK PAGAR (JATROPHA CURCAS L.) BASED ON RADIATION USE EFFICIENCY,WATER AND NITROGEN AVAILABLE) Gusti Rusmayadi; . Handoko; Yonny Koesmaryono; Didiek Hadjar Goenadi
Agromet Vol. 22 No. 1 (2008): June 2008
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

A number of crop growth simulation models have been developed using the radiation use efficiency (RUE) concept to predict crop growth and yield in various environments. These models generally calculate daily biomass production as the product of the quantity of radiation intercepted and RUE. Besides that biomass production was deterimined by water and nitrogen available factor. So, this research was carried out to quantify the RUE, biomass and leaf area index on Jatropha under rainfall condition, four levels of nitrogen fertilizer (N) and two and three population densities (P) planted twice. The experiments used a systematic Nelder fan design with 9 spokes and 4 – 5 rings were conducted at SEAMEO-BIOTROP field experiment in 2007. Data from the first experiment were used for parameterization and calibration and the second experiment data for model validation. Based on parameterization, we found that RUE can prediction above ground biomass accumulation of Jatropha were 0.94 (r=0.83) g MJ-1 to 1.3 (r=0.75) g MJ-1. Water availability was between ψ=-30 kpa and ψ=-1.5 MPa for field capacity and wilting point, respectively. Nitrogen demand of root, stem, leaf and grain N were (Ndemr=0.75), (Ndems=0.60), (Ndeml=2.53), and (Ndemg=2.41), respectively. Validation showed that model can simulate crop growth and development of Jatropha.

PENGUJIAN DAN PENERAPAN MODEL SIMULASI PERTUMBUHAN DAN PERKEMBANGAN TANAMAN GANDUM (Triticum aestivum L.) BERDASARKAN INTERAKSI AIR DAN NITROGENVALIDATION AND APPLICATION OF THE GROWTH AND DEVELOPMENT SIMULATION MODEL OF WHEAT ... Johannes E. X. Rogi; I. Handoko; D. Murdiyarso; Aan A. Daradjat
Agromet Vol. 13 No. 1 (1998): JUNE 1998
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Abstract is available in the full text (pdf format)

ANALISIS SIMULASI UPAYA MITIGASI GAS METAN PADA PADI SAWAH DI INDONESIASIMULATION ANALYSIS OF APPROACH ON MITIGATION OF METHANE GAS EMISSION RICE FIELDS IN INDONESIA Sobri Effendy; I. Handoko; RTM Sutamihardja; Rokhmin Dahuri
Agromet Vol. 12 No. 1 & 2 (1997): DECEMBER 1996/1997
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Abstract is available in the full text (pdf format)

EFISIENSI PENGGUNAAN AIR TANAMAN PADI SAWAH PADA TINGKAT PEMUPUKAN DAN VARIETAS YANG BERBEDA I. Handoko; Irlas Las; Ahmad Bey
Agromet Vol. 10 No. 1 & 2 (1994): DECEMBER 1994
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Abstract is available in the full text (pdf format)

MODEL FENOLOGI TANAMAN KELAPA SAWITA PHENOLOGY MODEL OF PALMOIL Fadjry Djufri; I. Handoko; Yonny Koesmaryono
Agromet Vol. 15 No. 1 & 2 (2000): DECEMBER 2000
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Abstract is available in the full text (pdf format)

HUBUNGAN ANTARA WAKTU TANAM DENGAN HASIL DAN PROFITABILITAS BUDIDAYA KENTANG (Solanum tuberosum l.) DI CIKAJANG, GARUTRELATIONSHIPS BETWEEN PLANTING TIME AND YIELD AS WELL AS PROFITABILITY OF GROWING POTATO ... Rakhmat Hanafi Ajis; I Handoko
Agromet Vol. 24 No. 1 (2010): JUNE 2010
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Relationships between planting time and yield as well as profitability of growing potato were investigated in Cikajang, Garut, based on water balance analysis and survey to potato farmers of the area. In general, there were three planting dates namely December-January, April-May and August-September. Yield and profitability of growing potato for planting time of August-September was less compared to the other two planting times due to lack of soil-water availability related to less rainfall as well as its high rainfall variability during dry season (coefficient of variation = 133%). Yields of potato for planting times December-January, April-May and August-September were (21.4 + 3.4), (20.5 + 3.5) and (16.9 + 2.2) tonnes/ha, respectively.Relationships between planting time and yield as well as profitability of growing potato were investigated in Cikajang, Garut, based on water balance analysis and survey to potato farmers of the area. In general, there were three planting dates namely December-January, April-May and August-September. Yield and profitability of growing potato for planting time of August-September was less compared to the other two planting times due to lack of soil-water availability related to less rainfall as well as its high rainfall variability during dry season (coefficient of variation = 133%). Yields of potato for planting times December-January, April-May and August-September were (21.4 + 3.4), (20.5 + 3.5) and (16.9 + 2.2) tonnes/ha, respectively.

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... I. Handoko; Titik Kodarsih; A. Ariyani
Agromet Vol. 24 No. 2 (2010): DECEMBER 2010
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

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.

Water Demand Analysis of Sugarcane Based on Crop Simulation Model (Case Study: Kediri Regency, East Java) Astrid Yusara; Handoko Handoko; Bregas Budianto
Agromet Vol. 33 No. 1 (2019): JUNE 2019
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

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.

Co-Authors A. Ariyani A. Yanto Aan A. Daradjat Ahmad Bey Astrid Yusara Bregas Budianto Daniel Murdiyarso Didiek Hadjar Goenadi Didiek Hadjar Goenadi Ervan Ferdiansyah F. Djufri Fadjry Djufri Gusti Rusmayadi Impron Impron Irlas Las Johannes E. X. Rogi Lukman Hakim Noper Tulak Rakhmat Hanafi Ajis Rini Hidayati Rokhmin Dahuri RTM Sutamihardja Ruminta Ruminta Sobri Effendy Tati Nurmala Titik Kodarsih Upik Kesumawati Hadi Yonny Koesmaryono

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