The July 13 weekly crop and weather report includes interviews with Iowa State University Extension climatologist Elwynn Taylor, integrated pest management specialist Rich Pope, and soybean agronomist Palle Pedersen. Taylor says El Niño may be about to return, but for it to have significant impact on Iowa agriculture the southern oscillation index will have to be at least minus 0.8, right now it is minus 0.1. He says El Niño is generally positive to Iowa crop production.
Iowa State University
Cooper, Doug, "July 13 Crop and Weather Report" (2009). Integrated Crop Management News. 591.
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