Respon Anggrek Mokara Chark Kwan Terhadap Perbedaan Intensitas Cahaya (Light Intensity Response of Orchid Mokara Chark Kwan)

Orchid plant response to light intensity is dependent to crop variety. Generally, epyphyte orchid need less light intensity compare to teresterial orchid. The experiment aim to analyse the response of Mokara Chark Kwan to reducing light intensity. Randomised BlockDesign has been employed using five types of net with five replication. The main asumption to analyse is that plant well growing with sufficient nutrient and homogen age. The results indicated that more reducing light intensity is more increment of plant height and width of leave. Reducing light intensity, however, is not influence flower initiation and formation

Model Dinamik Penilaian Kesesuaian Agroklimat Tanaman Kedelai(dynamic Model Of Agroclimatic Suitability Of Soybean)

The experiment aims to arrange of data-based of agroclimatic suitability for soybean, to arrange dynamic models for evaluation of suitability for soybean, and to evaluate agroclimatic suitability for soybean on computer. Secondary data of soybean yield and climate were collected from four locations of West Java as specific site targets, those were: Pusakanagara Subang, Cimanggu Bogor, Karangpawitan Garut, and Pasirsarongge Cianjur. Dynamic model has been developed as a tool to assess agroclimatic suitability of soybean which comprises the class, sub class, and sub-sub class level. The model provides information on land productivity, climatic constraint, stages of plant development that related to climate condition. Agroclimatic suitability is classified to five classes, i.e. S1 (very suitable), S2 (suitable), S3 (moderately suitable), S4 (not suitable), and S5 (very not suitable). Base on climate data of 2002, the models indicated that class of S1 were not found. While Cimanggu Bogor is classified as S2; Pusakanagara Subang and Karangpawitan Garut are classified as S3; and Pasirsarongge Cianjur is classified as S4

Pewilayahan Agroklimat Tanaman Nilam (Pogostemon Spp.) Berbasis Curah Hujan Di Provinsi Lampung (Agroclimate Zoning of Patchouly (Pogostemon Ssp.) Based on Rainfall in Lampung Province)

The research purposed to determine the patchouly cropping in Lampung Province based on the agroclimate feasibility of area rainfall and to determine the monthly rainfall probability which less than the patchouly requirement. There are four steps on this research such as to determine the seasonal rainfall distribution by Principle Component Analysis, seasonal rainfall zoning by Cluster Analysis, and agroclimate zoning of patchouly by superimpossed annual region rainfall map, regional map of wet month, topography map to patchouly agroclimate requirement, and to determine the monthly rainfall probability which less than the patchouly crop requirement. The result of research shows 2,069,005 ha of Lampung Province area most feasible and feasible to patchouly cropping, which are spread in Lampung Barat Regency (15.7%), Lampung Tengah Regency (15.5%), Way Kanan Regency (14.3%), Tanggamus Regency (14%), Lampung Utara Regency (12.5%), Lampung Timur Regency (10.8%), Tulang Bawang Regency (8.5%), Lampung Selatan Regency (8.2%), Bandar Lampung City (0.4%) and Metro City (0.1%). The results also reveal that the seasonal rainfall in Lampung Province can be grouped in seven types (I-VII), and the most feasible area lay on type I-IV, but for feasible area lay on type I-VI. Related to rainfall probability, at type I there is not occured monthly rainfall ≤ 200 mm with probability ≥ 60%, where as at type II the condition can be occurred 5 months, at type III and IV occurred 4 months, and at type V and VI occurred 7 months

Indeks Kecukupan Air Untuk Penetapan Waktu Bera Kedelai Di Jawa Tengah(water Sufficiency Indices to Determine Fallow Periods of Soybean in Central Java)

Climate anomaly has impact on yield and productivity of soybean. An alternative to minimize its impact, it is important to determine period of fallow for soybean in dry land. Period of fallow was determined by using agroclimate analysis such as water satisfaction index (WSI). WSI required daily climate data, soil and agronomy parameter to calculte ETR/ETM fluctuation . Agroecology and soybean yield data were collected from October 2003 to February 2004 in Pondok Village, Ngadirejo Sub-District, Wonogiri District and in Pojok Village, Nogosari Sub-District, Boyolali District . Fallow period was analyzed using CWB-ETo, a daily water balance software developed by IAHRI based on FAO method. WSI was calculated for El-Nino and La-Nina years to determine planting period. The result showed that fallow period were different between locations due to soil and climate variability. The longest fallow period is Blora District from Januri III to October II. While the shortest fallow period are Semarang and Magelang

Pertumbuhan dan Produksi Paprika pada Berbagai Intensitas Radiasi Surya di Dataran Rendah, Batam(growth And Production Of Sweet Pepper Cultivated Under Different Solar Radiation Intensity At Lowland Region Of Batam)

An experiment has been conducted in Batam Island to study the response of sweet pepper which cultivated at lowland of 20 m asl, during November 2001 to May 2002. Five varieties have been used namely, Bangkok, Gold Flame, New Zealand, Spartacus and Tropica. Plants cultivated using hydroponic system under plastic house with ultra violet protection. The radiation of 100% (control) and it reduce of 25% and 50% used as treatment in order to determine the microclimate favourable for growing pepper in lowland. The results shown that reducing radiation intensity has influenced significantly on vegetatif growth, except leaf area index. The plants were grown under 100% and 25% radiation intensity performed taller with more branches compare to the plants under 50%. Variety of Spartacus has grew tallest than others. Stem diameter of control plants performed bigger than other plants, while reducing radiation intensity has no effect significantly to leaf area index. Experiment also revealed that reducing radiation intensity has significant effect on number and weight of peppers per plant, and thickness of flesh, compare to control. In general, Gold flame has produced best quality than others varieties although it has less number of fruits compare to Tropica

MODEL DINAMIK PENILAIAN KESESUAIAN AGROKLIMAT TANAMAN KEDELAI(DYNAMIC MODEL OF AGROCLIMATIC SUITABILITY OF SOYBEAN)

The experiment aims to arrange of data-based of agroclimatic suitability for soybean, to arrange dynamic models for evaluation of suitability for soybean, and to evaluate agroclimatic suitability for soybean on computer. Secondary data of soybean yield and climate were collected from four locations of West Java as specific site targets, those were: Pusakanagara Subang, Cimanggu Bogor, Karangpawitan Garut, and Pasirsarongge Cianjur. Dynamic model has been developed as a tool to assess agroclimatic suitability of soybean which comprises the class, sub class, and sub-sub class level. The model provides information on land productivity, climatic constraint, stages of plant development that related to climate condition. Agroclimatic suitability is classified to five classes, i.e. S1 (very suitable), S2 (suitable), S3 (moderately suitable), S4 (not suitable), and S5 (very not suitable). Base on climate data of 2002, the models indicated that class of S1 were not found. While Cimanggu Bogor is classified as S2; Pusakanagara Subang and Karangpawitan Garut are classified as S3; and Pasirsarongge Cianjur is classified as S4

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)

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

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)

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