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Dissolution Kinetics of Milled-Silicate Rock Fertilizers in Organic Acid
Oleh: Priyono, Joko, Gilkes, Robert John
A dissolution experiment was carried out to identify the effects of milling condition on dissolution kinetics of silicate rock fertilizers. Initially ground materials (Ø < 250 μm for basalt, dolerite, gneiss, and Ø < 150 μm for K-feldspar) were further milled with a ball mill (Spex...
Penerbit: UNIVERSITY OF LAMPUNG • Publikasi: 01 January 2008
Solubility of Rock Phosphate and its Effect to the Growth and Yield of Maize on Ultisols
Oleh: Kasno, Antonius, Setyorini, Diah, Dwiningsih, Sutisni
Phosphor is a macro nutrients and it becomes the main limiting factor for maize growth on Ultisols. Rock phosphate is one of P fertilizer sources contains high P and Ca content, slow release and soluble under acid condition, suitable for acid soil. The objective of this research is to study the solu...
Penerbit: UNIVERSITY OF LAMPUNG • Publikasi: 01 January 2008
Existing Versus Added Soil Organic Matter in Relation to Phosphorus Availability on Lateritic Soils
Oleh: Yusran, Fadly Hairannoor
Lateritic soils (Ultisols and Oxisols) are commonly characterised by high phosphate sorbing capacity due to the type of clay and present high content of aluminium (Al) and iron (Fe) oxides. Addition of fresh organic matter (OM) may contribute to management of these soils by releasing more bicarb...
Penerbit: UNIVERSITY OF LAMPUNG • Publikasi: 01 January 2008
Effects of land applications waste water of crude palm oil factory on some nutrient available in soil and nutrient content in palm oil
Oleh: Banuwa, Irwan Sukri, Pulung, Mamat Anwar
An experiment was aimed to study effect of waste water of crude palm oil (CPO) factory on some nutrient available in soil and nutrient content in palm oil.  The experiment was conducted using a completely randomized block design with six levels of waste water treatments (0, 250, 500, 750, 1.0...
Penerbit: UNIVERSITY OF LAMPUNG • Publikasi: 01 January 2008
Manures Effectivity to Enhanced the Availability of Phosphorus, Crops Growth and Yield of Rice and Corn in Acid Upland Soil
Oleh: Sulaiman, Yoyo
The research was conducted in Tamanbogo Station Research in the 2007 Rainy Season in upland rice-corn intercropping farming. The research design used Randomized Complete Block Design with 3 replications. The treatments were 1). 15 t ha-1 manures + Residues of rock phosphate (RRP), 2). Without ma...
Penerbit: UNIVERSITY OF LAMPUNG • Publikasi: 01 January 2008
Improvement of Soil Chemistry Characteristic of Upland with Rock Phosphate, Phosphate-Solubilizing Bacteria and Farm Yard Manure For Increase of Soybean Yield
Oleh: Noor, Aidi
The experiment aims to know the role of rock phosphate, phosphate-solubilizing bacteria and farm yard manure application in improve quality of acid upland and its influence to soybean yield. Experiment was conducted in the greenhouse using Ultisols from Kentrong at 2001 year....
Penerbit: UNIVERSITY OF LAMPUNG • Publikasi: 01 January 2008
Impact of Rainforest Conversion on Surface Runoff and Soil Erosion in Nopu Upper Catchment of Central Sulawesi
Oleh: Hidayat, Yayat, Sinukaban, Naik, Pawitan, Hidayat
Rainforest conversion into agricultural lands in Nopu Upper Catchment such as cocoa plantations, maizes, cassava, peanuts, and scrub and bush were significantly increase soil erosions and surface runoffs, which in turn will decrease crops productivity and hydrologic functions of watershed. Soil ...
Penerbit: UNIVERSITY OF LAMPUNG • Publikasi: 01 January 2008
Sustainable Dry Land Management Model on Corn Agribusiness System
Oleh: Pujiharti, Yulia, Haridjaja, Oteng, Eriyatno, .
The study aimed at building model of dry land management. Dynamic System Analysis was used to build model and Powersim 2.51 version for simulating. The parameter used in model were fertilizer (urea, SP-36, ACL), productivity (corn, cassava, mungbean), soil nutrient (N, P, K), crop nutrient r...
Penerbit: UNIVERSITY OF LAMPUNG • Publikasi: 01 January 2008
Andisols from Tondano Area, North Sulawesi: Properties and Classification
Oleh: Hikmatullah, .
Three pedons of Andisol (TN-1, TN-2 and TN-3) developed from young volcanic materials of the Lokon, Soputan, and Lengkoan volcanoes respectively in the Tondano area, North Sulawesi, were studied in the field, and 18 soil samples were analysed in the laboratory for physical, chemical, and mineralogic...
Penerbit: UNIVERSITY OF LAMPUNG • Publikasi: 01 January 2008
Resistor Network Analogy of Non-obtuse Finite Element Model for Electrical Impedance Tomography
Oleh: Komarudin, Muhammad
This paper introduces resistor network analogy of Finite Element Modelling (FEM). The nonlinear iterative algorithms for image reconstruction in Electrical Impedance Tomography (EIT) involve computation with large matrices resulting from FEM. Consequently, it is difficult to realise real-time soluti...
Penerbit: Department of Electrical Engineering, Faculty of Engineering, Universitas Lampung • Publikasi: 01 September 2007