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Displaying 1351 - 1355 of 1605Farmers’ assessment of soil quality in rice production systems
In the recent past there has been increasing recognition that local knowledge of farmers can yield insight into soil quality. With regard to constraints and possibilities for the production of irrigated rice in the south of Brazil there is no documentation on local soil knowledge. The goals of this study were to answer the following questions: (1) Which soil quality perceptions do rice farmers have? (2) Which soil quality indicators are most important to them?
Comparison of vegetation water contents derived from shortwave-infrared and passive-microwave sensors over central Iowa
Retrieval of soil moisture content using the vertical and horizontal polarizations of multiple frequency bands on microwave sensors can provide an estimate of vegetation water content (VWC). Another approach is to use foliar-water indices based on the absorption at shortwave-infrared wavelengths by liquid water in the leaves to determine canopy water content, which is then related to VWC.
Direct-seeded rice culture in Sri Lanka: Lessons from farmers
About 95% of the rice grown in Sri Lanka is direct-seeded (wet- and dry-seeding). The average rough rice yield in irrigated predominantly direct-seeded dry zone (DZ) is about 5.0tha⁻¹and in the wet zone (WZ) it is about 3.3tha⁻¹. However the average realizable yield in DZ and WZ are 8tha⁻¹ and 5tha⁻¹ respectively. A survey was conducted to understand the cultural practices, farmers' perceptions and the reasons for the yield gap in direct-seeded rice culture in Sri Lanka.
PV site suitability analysis using GIS-based spatial fuzzy multi-criteria evaluation
This paper presents some preliminary results from a research study conducted on solar energy resource assessment in Oman. GIS-based spatial multi-criteria evaluation approach, in terms of the FLOWA module was used to assess the land suitability for large PV farms implementation in Oman. The tool used applies fuzzy quantifiers within ArcGIS environment allowing the integration of a multi-criteria decision analysis. Land suitability analysis for large PV farms implementation was carried out for the case study of Oman.
Trophic assessment of streams in Uruguay: A Trophic State Index for Benthic Invertebrates (TSI-BI)
Human activities are radically changing natural land cover and increasing the delivery of soil, organic compounds, nutrients, toxic agrochemicals and other contaminants to aquatic ecosystems. The eutrophication of streams, rivers, lakes, reservoirs and costal zones is one of the most important consequences of human activities. In this study we assessed the trophic status of 28 wadeable stream reaches of the Santa Lucía basin, an important economic region of Uruguay. We developed a Trophic State Index of Benthic Invertebrates (TSI-BI), the first of its kind for South American lotic systems.