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Research on satellite imagery aims to advance sustainable agriculture
Date:4/1/2011

CORDOBA, SPAINIrrigating agricultural crops places huge demands on water resources around the globe. In Spain for instance, where agriculture is a major contributor to the nation's economy, 85% of country's total water demand comes from the agricultural sector. The excessive use of irrigation water has resulted in serious environmental concerns in Mediterranean countries, where rising demand has deteriorated groundwater resources, depleted aquifers, and accelerated saltwater intrusion. Scientists in Spain are working on new technologies to classify and monitor irrigated crops with a goal of promoting sustainable agricultural practices.

"To encourage sustainable use of water resources, it is essential to develop advanced and accurate tools to classify and monitor irrigated crops and to estimate the surface occupied by each irrigated crop, each of which usually has different water requirements", said Francisca Lpez-Granados, lead author of a study published in a recent issue of the Journal of the American Society for Horticultural Science. Lpez-Granados and a team of researchers reported on field studies they designed to evaluate the potential of multispectral reflectance and seven vegetation indices in the visible and near-infrared spectral range for discriminating and classifying bare soil and several horticultural irrigated crops. According to the scientists, the research is the first step of a broader project with the overall goal of using satellite imagery with high spatial and multispectral resolutions for mapping irrigated crops.

The team collected on-ground reflectance data of bare soil and annual herbaceous crops (garlic, onion, sunflower, bean, maize, potato, winter wheat, melon, watermelon and cotton), perennial herbaceous crops (alfalfa and asparagus), deciduous trees (plum), and non-deciduous trees (citrus and olive) using a handheld field spectroradiometer in spring, early summer, and late summer. They applied three classification
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Contact: Michael W. Neff
mwneff@ashs.org
703-836-4606
American Society for Horticultural Science
Source:Eurekalert

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