תפריט נגישות
ניגודיות עדינהניגודיות גבוהה
מונוכרום
הדגשת קישורים
חסימת אנימציה
פונט קריא
סגור
איפוס הגדרות נגישות
להורדת מודול נגישות חינם תפריט נגישותניגודיות עדינהניגודיות גבוההמונוכרוםהדגשת קישוריםחסימת אנימציהפונט קריאסגוראיפוס הגדרות נגישותלהורדת מודול נגישות חינםAlex Furman, Ali Zur - Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa, Israel
Advanced agricultural irrigation practices require precise application of water and nutrients to the plants to maximize efficiency and minimize losses. This approach led to the development of drip and mini sprinkler irrigation techniques, as well as fertigation practices. Traditionally, the root zone and the vadose zone were treated as pseudo homogeneous domains. However, these modern practices clearly create and require more detailed spatial treatment. We present here two different applications of geophysical tools for monitoring water distribution in the root zone and the vadose zone. Both make use of electrical resistivity tomography and supporting tools. The first aims at mapping the root zone of a single plant for water content at relatively high resolution, for a detailed understanding of water content dynamics, flow patterns, and root water uptake and its dependence on environmental conditions. The second aims at mapping the water regime and flow patterns under drip irrigated orchards. Preliminary results for the single root investigation clearly indicate that different environmental conditions create significantly different plant behaviour that is expressed, among other indices, in different uptake rates and therefore different water distribution schemes. The outcome is that for modern irrigation techniques, simplistic assumptions regarding root distribution and root uptake are insufficient. For the vadose zone monitoring, results show significant heterogeneity in water flow patterns, which is season dependent. By spatially monitoring water content distribution throughout the year we identify water that is not used by the plant and therefore leads to lower irrigation and fertigation efficiency.
from: The Dahlia Greidinger International Symposium 2009 on Crop Production in the 21st Century: Global Climate Change, Environmental Risks and Water Scarcity.
The main objective of this Symposium is to re-examine research and development directions, needs and knowledge gaps, and identify possible modes for coping with the increasing severity of water scarcity, reduced water quality, soil degradation, and their effects on food security. Special emphasis will be placed on crop production and plant nutrition aspects in Arid and Semi-arid regions in a world of global climatic changes and limited water supplies. Particular attention will be devoted to water problems within the Middle East.
Alex Furman, Ali Zur - Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa, Israel
Advanced agricultural irrigation practices require precise application of water and nutrients to the plants to maximize efficiency and minimize losses. This approach led to the development of drip and mini sprinkler irrigation techniques, as well as fertigation practices. Traditionally, the root zone and the vadose zone were treated as pseudo homogeneous domains. However, these modern practices clearly create and require more detailed spatial treatment. We present here two different applications of geophysical tools for monitoring water distribution in the root zone and the vadose zone. Both make use of electrical resistivity tomography and supporting tools. The first aims at mapping the root zone of a single plant for water content at relatively high resolution, for a detailed understanding of water content dynamics, flow patterns, and root water uptake and its dependence on environmental conditions. The second aims at mapping the water regime and flow patterns under drip irrigated orchards. Preliminary results for the single root investigation clearly indicate that different environmental conditions create significantly different plant behaviour that is expressed, among other indices, in different uptake rates and therefore different water distribution schemes. The outcome is that for modern irrigation techniques, simplistic assumptions regarding root distribution and root uptake are insufficient. For the vadose zone monitoring, results show significant heterogeneity in water flow patterns, which is season dependent. By spatially monitoring water content distribution throughout the year we identify water that is not used by the plant and therefore leads to lower irrigation and fertigation efficiency.
from: The Dahlia Greidinger International Symposium 2009 on Crop Production in the 21st Century: Global Climate Change, Environmental Risks and Water Scarcity.
The main objective of this Symposium is to re-examine research and development directions, needs and knowledge gaps, and identify possible modes for coping with the increasing severity of water scarcity, reduced water quality, soil degradation, and their effects on food security. Special emphasis will be placed on crop production and plant nutrition aspects in Arid and Semi-arid regions in a world of global climatic changes and limited water supplies. Particular attention will be devoted to water problems within the Middle East.
