Warta Informatika Pertanian : Volume 18 No. 2, 2009

TIM PENYUSUN

Penanggung Jawab :

DR. HARYONO SOEPARNO

Dewan Redaksi :

DR. MARHENDRO; DR. M. SABRAN

Anggota :

Dr. Wayan R. Susila ; Dr. L. Hardi Prasetyo ; Ir. V. Rino Hermawanto, M.S ; 

Dhani Gartina, S.Komp. ; Ir. Erlita Andriani, M.Sc ; Dra. Siti Nurjayanti, M.Sc ; Drs. Iwa Sungkawa, M.S.

Redaksi Pelaksana :

Mimbarsono ; Ir. Sri Arini Daryati ; Mohammad Maulana, Amd.

    

  • Model Rak Lintas Lokasi (Over Locations) Untuk Hasil dan Komponen Hasil Kacang Tanah

Sutarno, Balitkabi - Malang, Jawa Timur.

Randomized Group Design is one of the agricultural research designed that most applicated. The randomized design applied to determining the diversity each different location. Randomized design analysis have done to each research location by it self not sustable because role of location uncomplete and also mean of interaction between location x fertilizer treatment. This research analyzed differences over location problem and fertilizer treatment to increasing of peanut yield, that analyzed by Randomized Design model. This research was conducted dry and Alfisol in Blora, Wonogiri and Karanganyar in wet season 2007. This research showed that peanut yield increasing by application of organic fertilizer combination formulated 1000 kg/ha + 50 kg/ha Urea + 50 kg/ha SP-36 + 100 kg/ha ZK- plus. The increased of peanut yield (40,17%) from mean peanut production as control 2,081 become 2,917 t/ha. The other organic fertilizer treatment is significantly peanut yield. Key words : Organic fertilizer, Over location soil   diversity, Randomized Block Design Model.

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  • Penditeksian Pencilan (Outlier) dan Residual Pada Regresi Linier
Iwa Sungkawa, Dosen Universitas Bina Nusantara, Fakultas Sains dan Teknologi - Jakarta.

This paper discusses the study of outlier and residual detection in the linear regression, conducted by study of the requirements and the necessary assumption that the residual regression model is reliable and can be used. Assumption of normality is one of necessary condition that the residuals, so if there are outlier residual will have not consequences in normal distribution. So to do detection of outlier from the data observations. Besides that need to normality tested of the residuals or directly to the variable of responses (observations). Presence or absence of observation as outlier can be characterized by the distribution of residuals and the correlation coefficient. Outlier detection can be followed by determining of each observation residuals is followed by determining ist the median, and the statistic T is used to test the existence of outlier. Quartile deviation (dQ) is simple alternative to a detecting of outlier. The results of the study show that to normality test, can be done on the residual or on the response variables (the dependent variables). Study of the residual can be done by plotting the residuals of the independent variables and the dependent variables. Efforts to overcome the outlier can be done with the data transpormation so the data as outlier need not disposed. Keywords : correlation, median, normality, outlier,  regression analysis,residuals.

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  • Analisis Fungsi Produksi Intensifikasi Usahatani Padi di Kabupaten Manokwari
Jeffry E. Sianipar, Parlindungan Silitonga dan S. Hartono, Sriwidodo, Dwidjono. Sekretariat Badan Litbang Pertanian - Jakarta dan Dosen Ekonomi Pertanian UGM - Yogyakarta.

Rice productivity achieved in Manokwari district is still very far below national production of 2,5 ton/ha. Efforts by local governments to increase productivity through the intensification of rice farming is the provision of production facilities, improvement of cultivation and post-harvest technology, conduct of training for farmers and extension workers, and others. The objectives of the research are to recognize and analyze the factors that affect the production of rice farming. The Location of research in Distrik Prafi SP 1 and Masni SP 8 as the sentra areas of paddy with 60 farmers sample and each Distrik was taken 30 samples. Research Analysis use Cobb-Douglass function production and estimated with Ordinary Least Square (OLS). Result of analysis shows that seed, fertilizer (urea, NPK and PPC), and farming intensification can increase production of paddy. Keywords :  farming intensification, production

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  • Analisis Kelayakan Usahatani Jeruk Keprok Soe di Kabupaten Timor Tengah Selatan Nusa Tenggara Timur
Yusuf, Masniah dan Masyhuri, Irham, Jangkung Handoyo Mulyo. BPTP NTT dan Dosen Ekonomi Pertanian UGM - Yogyakarta. 

Mandarin keprok soe is one of preeminent national commodity from NTT. But the production and the productivity recently descend. It is assumed that the pest attack is the main problem here. The research was done at Timor Tengah Selatan area on March until December 2009. The data collection was done trough a survey and the purpose was to identify the actual problems included to analyze the well-deserved Soe orange farm. The result of the research showed that there were some actual problems which related to the Soe orange farm, such as: (1) the preeminent varieties had not improved yet, (2) the shape and preservation cut were not done based on the right instruction, (3) The population of Soe orange drastically descend, (4) the farm association more focused on the production. The receiving BEP is Rp. 2.806.403,- the price BEP is 4.190/kg; and the production BEP is 356,37 kg. NPV value is Rp. 14.950.550,49 (above zero), it means mandarin keprok soe farm is profit enough. The net B/C ratio value is 1,99 (higher than 1). It means every Rp.1,- that invested will get the Rp. 1,99 receiving, so it deserves to carry out. If we see the IRR calculation result that reach to 42%, it is clear that Mandarin keprok soe farm deserve to attempt, because the internal capital payback of the Mandarin keprok soe farm is higher than the interest of invest. The payback period of the Mandarin keprok soe farm is 5,20 years. Key word : Mandarain keprok soe, well-deserved farm, Timor Tengah Selatan

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  • Lahan Sawah di Indonesia Sebagai Pendukung Ketahanan Pangan Nasional
Wahyunto, Balai Besar Sumber Daya Lahan Pertanian - Bogor. 

Recently, total area of paddy field in Indonesia about 7,8 million hectares, including: irrigated, rainfed, tidal and deep water. Rice production stock dominantly supported by  irrigated padddy field (60,3%) and rainfed paddy field (26,5%), both fields are concentrated in Java island. Due to limited water resources availability and decrease of environment quality of Java, it is contain high risk sustainable for fully oriented based supported rice stock from Java island. Application of new and modern technology to increase rice production and its productivity could be achieved through increasing intensification strategy and bio-technology application (genetic modification, hybrid seedling), accompany with management improvement and environment stability consideration. In the near future, food commodities such as cassava, soybean are not only benefit for food but also used as renewable based material bio-energy. This condition will hamper  the used of  existing land resources optimalization including paddy field for the meet food crops demand. Strengthening food stability should be back stopped by agricultural land extensification. However, availability acurate data on potential and available land could be used for agriculture (paddy field), could be used to supply food, are primary needed. Without accurate data supplies, planning strategy on land resources management food supply will be un controlled. Up to now, paddy field/ rice is still a strategic commodity in Indonesia, because paddy field/rice is the  main source of food security is also an economic resource for over 30 million farmers. Efforts to increase rice production must be balanced by increasing farmers' income, ease of accessibility to consumers, and the actualization of food security. Keywords : food security, land conversion, paddy fields, productivity.

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