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Purwadi, Tri
Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Published : 4 Documents
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Pemanfaatan Energi Angin di Daerah Pertanian Pantai Kabupaten Kulonprogo, Daerah Istimewa Yogyakarta Purwadi, Tri
Agritech Vol 7, No 2 (1987)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/agritech.19007

Abstract

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Model Dinamika Ketersedian Pangan - Studi Kasus : Ketersediaan Beras di Wilayah Madiun, Jawa Timur Purwadi, Tri; Sutiarso, Lilik; Sudira, Putu
Agritech Vol 23, No 1 (2003)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/agritech.13520

Abstract

In order to predict and determine level of food security in a certain area, a dynamic system approach model of food supply-demand planning that based on regional resources was developed. The model was run using both primary and secondary data, which were gathered in the study area, Madiun Region, East Java Province. One of food crop comodities that was focused for simulating the model was rice. To validate the developed model, one scenario was selected, there were no changing of planting or harvesting area and rice productivity level, also rice imported from other areas (countries) was zero for five next years. The simulation results indicated that the level of actual food security (1.29 - 1.27 years) was higher than governments level (1.25 years), though the rice market price decreased gradually.
Optimasi Usahatani Lahan Kering dengann Evaluasi Lahan di Kecamatan Playen Kabupaten Gunung Kidul Hidayati, Umi; Harsono, Harsono; Purwadi, Tri
Agritech Vol 23, No 3 (2003)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/agritech.13508

Abstract

The objectives of this research were to evaluate land suitability for farming of corn, soybean, and groundnut in Playen District, Gunung Kidul Regency and to know the optimum suitable farming for corn, soybean, and groundnut in that area. This research was carried out during the planting season of 1999/2000. Land unit map was made by overlapping the maps of soil classification, climate, slope, land use, and administration. Matching was done between land qualities and land characteristics with land requirements for planting corn, soybean, and groundnut. After getting land suitability map, the further step was optimation by using linier program to get the optimum land suitability map for research area. The result of the research was 21 land units from 34 land units that can be calculated, while 13 other land units cannot be calculated because they had no agricultural land or land suitability class N2. Land suitability class for corn, soybean, and groundnut were S2, S3, and N2 for each commodity. The result of oprimation by using linier program made profit of Rp 6.196.992.577 in one year with three planting seasons and with planted area for the first planting season was 2.733,041 ha, and the third planting season was 2.843,841 ha. The suitable crop for the research area were 3 land units suitable for corn, 12 land units for soybean, and 6 land units for groundnut
Prediksi Aliran Permukaan Menggunakan Modifikasi Model Bilangan Kurva Sudira, Putu; Purwadi, Tri; Sukresno, Sukresno; Nurlaili, Meli
Agritech Vol 25, No 1 (2005)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/agritech.13372

Abstract

The objectives of the study are (i) to predict surface runoff of watersheds using modification of curve number model, and (ii) to find out the good fit of model application at different size of watersheds. The research was conducted in Padas sub watershed (3356.48 ha)- and Goseng sub watershed (596 ha), upper Solo watershed, Central Java. The data used for analysis were daily rainfall, daily of water level in the stream, soil type, landuse, and minimum infiltration rate from 1998 up to 2002. Surface runoff was calculated using modification of Soil Conservation Service Curve Number Model, which was integrated with the model of SWRRB (Simulator for Water Resources in Rural Basins). The use of curve number model was based on the availability of data such as soil type evaluation, landuse, conservation practices, initial soil moisture contents, and the hydrologic condition of the watersheds. Results indicated that the model was not valid for bigger watershed (Padas sub watershed). This was denoted by low values of correlation coefficient between observed and predicted surface runoff The tws, indicated that observed and predicted surface runoff are significantly different. On the other hand, for the smaller one (Goseng sub watershed) the model was agreed, it was illustrated by no significantly different between observed and predicted surface runoff based on the statistical measures above.