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Budi Rahardjo

Fakultas Teknologi Pertanian, Universtas Gadjah Mada, Yogyakarta

Author-ID : 2871028

Agriculture, Biological Sciences & Forestry

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Model Respirasi BUah Salak Pondoh (Salacca Zallaca cv. Pondoh) yang Disimpan dalam Atmosfir Termodifikasi Berdasarkan Kinetika Enzim Rofandi Hartanto; Suprodjo Suprodjo; Budi Rahardjo; Tranggono Tranggono
agriTECH Vol 23, No 4 (2003)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

The salacca (Salacca zalacca cv. Pondoh) fruits were stored in various modified atmosphere conditions in the impermeable cuverles with the variation of oxygen concentration of 2, 4, 6 and 8%. carbon dioxide concentration of 1, 2. 3 and 4% and nitrogen concentration as the rest. The variation of temperature was 12, 20 and 24 C. Gases within each cuvette were replaced daily. The respiration rate of the fruit was mudded based on the enzyme kinetic theory. The result showed that the respiration model Mows the Michaelis-Menten enzyme kinetic, with CO2 as the uncompetitive inhibitor. The model was fit to predict the respiration rate of the fruit.

Simulasi Numerik Gerakan Lengas Tak Jenuh dalam Tanah pada Sistem Irigasi Tetes Muhammad Aqil; Sigit Supadmo; Budi Rahardjo
agriTECH Vol 22, No 3 (2002)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

The soil of coastal plain is characterized by sandy soil texture, salinity problem, low water capacity, high oercolation rate and high soil temperature during day time. Due to those constraints, therefore much water is needed to be favorable to plant growth. Objective of the research is dealing with the application of numberical method to simulate heat and mass flow of water which is affected by soil moisture availability. A core of soil sample with size 50 cm x 50 cm x50 cm is used as a physical model. The research has been schedule from 1997 to 1998. Under high initial moisture content the simulation shows that there is similarity between predicted and observed value of soil moisture content with the correlation value more that 90% (t-test value 95%). However, the simulation is under estimate for low initial moisture content and high temperature. For the model applications, the factor's which influence on moisture movement in the soil was collected and rearranged in exponential equation: θv = 103,469. Qirr 0.015. T 0.061. t 0.235. x -0.161. z -2.842. From the model found that to keep soil moisture content in favorable condition (θv = 0,1 cm3/cm3), the discharge design of drip irrigation needed was 3.2 cm3/sec with 2 hours duration of irrigation. The discharge designed based on water needed for evaporation and heat flushing so that moisture in the root zone was maintained.

Model Perubahan Gula Buah Salak Pondoh (Salacca edulis Reinw cultivar Pondoh) pada Kondisi Atmosfer Termodifikasi Rofandi Hartanto; Budi Rahardjo; Suhardi Suhardi
agriTECH Vol 20, No 1 (2000)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Co-Authors Muhammad Aqil Rofandi Hartanto Sigit Supadmo Suhardi Suhardi Suprodjo Suprodjo Tranggono Tranggono

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