Warta Informatika Pertanian : Volume 20 No. 1, 2011

ISSN 0852-1743
Terakreditasi dengan Predikat C
Sertifikat No. 383/AU1/P2MBI/07/2011
(SK Kepala LIPI No. 629/D/2011)
Diterbitkan dua kali setiap tahun oleh :
Sekretariat Badan Litbang Pertanian
Badan Penelitian dan Pengembangan Pertanian

Penanggung Jawab :
SEKRETARIS BADAN LITBANG PERTANIAN

Dewan Redaksi :

Ketua :
Dr. Ir. L. Hardi Prasetyo, M.Agr. (Genetika Kuantitatif/Statistika)

Wakil Ketua :

Dr. Ir. Rohlini, M.S. (Manajemen Sumberdaya Pertanian)

Anggota :

Prof.(Riset) Dr. Elna Karmawati, MS. (Entomologi/Statistika)
Prof.(Riset)Dr. Kedi Suradisastra, M.Sc. (Sosiologi dan Kelembagaan Pertanian)
Prof.(Riset) Dr. Ir. Subandriyo, M.Sc. (Pemuliaan dan Genetika Ternak)
Drs. Bambang Sankarto, M.I.M. (Teknologi Informasi)
Dr. Ir. Muhamad Sabran, M.Sc. (Produksi Tanaman/Statistika)
Ir. Erlita Adriani, MBA.  (Sistem Informasi)
Dra. Siti Nurjayanti, M.Sc. (Teknologi Informasi)

Mitra Bestari :

Prof.(Riset) Dr. Istiqlal Amin
Prof. Dr. Asep Saefuddin
Prof. Dr. Handoko
Prof.(Riset) Dr. Budiman Francen Hutabarat
Dr. Fahmuddin Agus
Drs. Iwa Sungkawa, M.S.
Dr. Wayan R. Susila

Redaksi Pelaksana :

Mimbarsono
Mohamad Maulana, A.Md.
Henny R. Sipayung, S.Sos.
Wasiyah Utami, A.Md.
  •  Pemanfaatan Data Unduhan Gratis dari Internet untuk Penelitian
    Sumberdaya Lahan

Rizatus Shofiyati dan Wahyu Supriatna, BBSDL
Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian, Jl.Tentara Pelajar No.12 Cimanggu-Bogor 16111
E-mail : rshofiyati@litbang.deptan.go.id

Research on land resources and mapping is sometimes constrained by the availability of supporting data, such as satellite imagery, digital base and thematic maps, rainfall, and others, whereas the provision needs much cost. Currently, a lot of data is available and can be downloaded for free on website. The data is appropriate and can be used at a certain level and scale. By using a set of adequate computer equipment and internet connection, data can be downloaded and used for research and mapping of land resources. The purpose of this paper is to provide information for researchers to use free data from internet, hence, the lack of data constraints on study of land resources can be eliminated. Some data are reliable and can be used to support the study, such as rainfall data from TRMM website, high resolution imagery in Google Earth, Landsat images in GloVis, ALOS PALSAR in K&C Mosaic Homepage, DE/SM from SRTM and ASTER GDEM, base map in Bakosur-tanal website, or thematic map, such as soil from HWSD, and others. Several studies have used the data are estimation models such as erosion, landforms delineation to assist land mapping, and others.This paper describes some free downloaded data that can be used for land resources research and mapping. It is also presented some website addresses that provide the data and also how to download them, a as well as several studies have utilized these data are also presented in this paper. It is also explained advantages and disadvantages of each data based on their specifications and characteristics, such as spatial and time resolution, for determining and analyzing results of studies that use the data.

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  • Manfaat Sistem Informasi Berbasis Teknologi Informasi dan Komunikasi
    untuk Keberdayaan Petani Sayuran
Sumardjo1), Djuara P Lubis2), Eko Sri Mulyani3), dan
Retno Sri Hartati Mulyandari3)
1) Kepala Pusat Kajian Resolusi Konflik dan Pemberdayaan LPPM IPB,
2) Departemen Komunikasi dan Pengembangan Masyarakat,
    Fakultas Ekologi Manusia,  Institut Pertanian Bogor
3) Pusat Perpustakaan dan Penyebaran Teknologi Pertanian, Jl. Juanda 20
    Bogor 16122
E-mail : pustaka@litbang.deptan.go.id

Information and Communication Technology (ICT) have some important roles supporting the farmer in decision-making process through information system development. The research have four objectives, are: 1) Analyzing the  benefit  of  information system based on ICT; 2) Assessing the constraints of information system based on ICT; 3) Analyzing the factors influencing information system development based on ICT; and 4) Designing the strategy of information system based on ICT to support the vegetable farmer empowerment. The research was conducted in Cianjur (West Java) and Batu (East Java) on July to November 2010.  Data collection techniques used in this study was conveniance sampling derived from the 200 respondents with closed and semi-open questionnaires and processed by using Likert scale. Quantitative data were analyzed statistically based on correlation and t_test. The benefits of agricultural information system based on information technology is to open opportunities as possible for farmers to market information and agricultural technology and accelerate the process of communication and information access, thus increasing the network of communication and bargaining position of farmers. Whereas many constraints that stakeholders were known in ICT utilization can be divided into five major categories, are management, infrastructure, human resource development, culture, and content. Knowledge, attitude, and capabilities in ICT utilization, ICT ouwnership, education level, age, and social status are the dominant factors  influencing the accessibilities of agricultural information system based on ICT. Whereas the dominant factors influencing the vegetable farmer empowerment are the intensity and the level of ICT utilization. Mechanism of maintenance and provision the relevant and timely of content within related institution including socialization and assistance by extension workers/local communication institution through multi-step-flow communication as needed  to optimize the ICT utilization so that it can support the empowerment process of vegetable farmers.

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  • Rancang Bangun Model Fenologi Tanaman Jarak Kepyor (Ricinus Communis L)
Fadjri Djufry
Balai Pengkajian Teknologi Pertanian, Papua. Jl. Yahim No.49 Sentani
Jayapura 99352 Kotak Pos 256 Sentani
e-mail : fadjry2006@yahoo.co.id ; bptp-papua@litbang.deptan.go.id

The development stage of cannot be expressed simply as chronological age, because of several environmental factors, such as temperature and water stress. They can speed up or reduce the rate of phenological development. The research aimed to construct a crop development model of castor oil (Ricinus communis L). The research was conducted for two-year period  at three locations having distinct environmental conditions, i.e. Malang (575 m), Sukamandi (50 m) and Situbondo (5 m). The field experiment was done to collect data to support the construction and validation of the development model being developed. The development model was constructing from calculating thermal unit. Development crops observed consisted of four phases : (1)  phase of emergence (planting until emergence), (2)  floral bud ( emergence until floral bud), (3) anthesis (floral bud until anthesis), and (4) harvest ( anthesis until harvest). The t-test does not indicate significant difference between observed and predicted period between development phases. The model is valid and reasonably well for predicting  period between development phases as long as castor growth. The difference between simulation and observation on period development phases is about 1-2 days. Crop development, on the other hand, was determined by temperature and thermal unit of various stages were derived from this experimental data.

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  • Penerapan dan Penelusuran Parameter Sebaran Eksponsial, Gamma, dan
    Beta, Sah Sebagai Fungsi Peluang
Muhammad Yasin Hasanul Gaffar, dan Syuryawati.
Balai Penelitian Tanaman Serealia, Jl. Dr. Ratulangi Maros - Sulawesi Selatan
e-mail : hg_yasin@yahoo.co.id ; balitsereal@litbang.deptan.go.id 

The probability of A : P(A)>0, in each of A€N,  2). P(W)=1, and 3) additive- s; if {Aj, Aj€N,  Ai cup with Aj= f, i¹j ,) j = 1,2,3,, . . . . and than  p(U) = Σp(Aj), j=1,°°. The distribution was valid as probability function if Σxi =1. By computed with integral methods was founded that Exponensial Σfxi = òle-lx dx = r(2) = 1, Expected value Î(x)=1/l, variance s2(x)= 1/ l2, l>0, moment generating function M(x)(t)= l/(l-t), t< l.
Distribution of Gamma : Î(x)=r/l, s2(x)= r/ l2, l, and r>0, M(x)(t)= [l/(l-t)]r, t< l. Beta Î(x)= a/(a+b), s2(x)= ab/[(a+b)2.(a+b+1)], moment generating function of Beta was not useful. Exponential model could be applied to find of relation between yielded of maize and asi (anthesias silking interval), Gamma and Beta to expanded for solution of calculus-integral include of fisica and techniqs The paper was to aim to shown that Exponential, Gamma,and Beta distribution were valid as probability function and could be applied to founded of maize yield under asi (anthesis silking interval) model. 

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  • Analisis Hubungan Faktor Topografi dan Penggunaan Lahan Terhadap Tingkat
    Erosi
Muhammad Aqil, dan Nining Andayani.
Balai Penelitian Tanaman Serealia, Jl. Dr. Ratulangi Maros - Sulawesi Selatan
e-mail : balitsereal@litbang.deptan.go.id  ;  acchmad@yahoo.com 

Soil erosion is a major environmental problem in Indonesia. Topographic and land use system are considered as the important factor affecting soil erosion. This study addresses a methodology for identifying the relationship of topographic and land use type on erosion occurrence.The research was conducted in Indonesia from 2008 to 2009. The RUSLE model was applied to the Bengawan Solo watershed using GIS. The watershed was divided into 100 x 100 m grid cells, and the calculation was performed using ArcGIS software. The results of calculation indicated that the area covered by High, Severe, and Very Severe erosion potential zones in this watershed were 18.87%, 15.86%, and 5.97% of the total area respectively. More than 40% of the watershed area showed average annual soil loss >60 t/ha/yr. Topographic and land use are considered as the major factors that contribute to the high sediment transfer from upland areas. Spatial analysis showed that upland field activity on the moderate-steep slope contributed significantly to the soil erosion. Thus, these areas need immediate attention for soil and water conservation activities to prevent further land degradation and its depleting productivity. Land conservation map has been created to localize land use features as well as recommended conservation measures which should be applied in order to limit further land degradation..

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