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Keywords = the island of Miyakojima

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13 pages, 433 KiB  
Article
Optimal Choice of Soil Hydraulic Parameters for Simulating the Unsaturated Flow: A Case Study on the Island of Miyakojima, Japan
by Ken Okamoto, Kazuhito Sakai, Shinya Nakamura, Hiroyuki Cho, Tamotsu Nakandakari and Shota Ootani
Water 2015, 7(10), 5676-5688; https://doi.org/10.3390/w7105676 - 20 Oct 2015
Cited by 6 | Viewed by 5687
Abstract
We examined the influence of input soil hydraulic parameters on HYDRUS-1D simulations of evapotranspiration and volumetric water contents (VWCs) in the unsaturated zone of a sugarcane field on the island of Miyakojima, Japan. We first optimized the parameters for root water uptake and [...] Read more.
We examined the influence of input soil hydraulic parameters on HYDRUS-1D simulations of evapotranspiration and volumetric water contents (VWCs) in the unsaturated zone of a sugarcane field on the island of Miyakojima, Japan. We first optimized the parameters for root water uptake and examined the influence of soil hydraulic parameters (water retention curve and hydraulic conductivity) on simulations of evapotranspiration. We then compared VWCs simulated using measured soil hydraulic parameters with those using pedotransfer estimates obtained with the ROSETTA software package. Our results confirm that it is important to always use soil hydraulic parameters based on measured data, if available, when simulating evapotranspiration and unsaturated water flow processes, rather than pedotransfer functions. Full article
(This article belongs to the Special Issue Water Resource Variability and Climate Change)
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2 pages, 806 KiB  
Correction
Correction: Tamura, S. and Fujie, K. Material Cycle of Agriculture in Miyakojima Island: Material Flow Analysis for Sugar Cane, Pasturage and Beef Cattle. Sustainability 2014, 6, 812–835.
by Shuichi Tamura and Koichi Fujie
Sustainability 2014, 6(6), 3991-3992; https://doi.org/10.3390/su6063991 - 24 Jun 2014
Viewed by 4950
Abstract
We found a typo in our previous published paper [1]. “Okinawa Main Ilsand” and “Kyushu Ilsand” are supposed be “Okinawa Main Island” and “Kyushu Island”. [...] Full article
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24 pages, 1204 KiB  
Article
Material Cycle of Agriculture on Miyakojima Island: Material Flow Analysis for Sugar Cane, Pasturage and Beef Cattle
by Shuichi Tamura and Koichi Fujie
Sustainability 2014, 6(2), 812-835; https://doi.org/10.3390/su6020812 - 20 Feb 2014
Cited by 7 | Viewed by 11955 | Correction
Abstract
Agriculture on Miyakojima Island is highly dependent on imported fertilizer and feed. To reduce this dependence, the present research examines the biomass resources on the island by conducting a material flow analysis of stockbreeding and other related systems. To accurately quantify the amount [...] Read more.
Agriculture on Miyakojima Island is highly dependent on imported fertilizer and feed. To reduce this dependence, the present research examines the biomass resources on the island by conducting a material flow analysis of stockbreeding and other related systems. To accurately quantify the amount of available biomass resources, loss ratios of the storage and composting processes are established. Then, a material flow analysis of a composting facility is made. Finally, current material flows between beef cattle, sugar cane and pasturage are shown. Based on this research, two proposals are made: the first is to use urine as liquid fertilizer, which is currently being done in Saga prefecture. The precedent of using urine as fertilizer is now widely accepted in the Saga area; is considered to be readily adoptable in other areas and could be substituted for the imported fertilizers on Miyakojima Island. The second is to use more residues of sugar cane for the beef cattle feed when the pasturage growth is slow in the winter. The present research suggests that the silage feeds for beef cattle. Full article
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