July 23, 2009
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Soil & Groundwater Newsletter July 23, 2009 |
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| This Week´s Featured News Stories |
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Nitrogen recommendations based on crop reflectance
Nitrogen fertilizer is usually applied in greater quantities to corn than almost any other crop. But when it’s applied in excess of requirements, loss of the excess fertilizer to the environment can contribute to degraded water quality. One of the challenges to making an appropriate nitrogen fertilizer recommendation is the potential variability in soil nitrogen availability that may occur spatially across a field and temporally from year to year. A canopy reflectance sensor would provide an easy-to-use method for farmers to improve sidedress nitrogen applications to corn if canopy reflectance ... |
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Integrated weed management can reduce need for herbicides
The use of herbicides on crops causes environmental concerns. A new French study assesses the performance of cropping systems to manage weeds and finds that these techniques could control arable weeds in the long-term and reduce reliance on herbicides. In Europe, herbicides provide the conventional means of managing weeds on farmland. Although effective, herbicides are expensive and can build up resistance in weeds. More importantly, herbicide residues are frequently found in rivers, streams and lakes. This study evaluated four cropping systems based on Integrated Weed Management (IWM) ... |
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