QUIZ – This Week in Agronomy Jay Whetter June 15, 2022 Four questions on things we’re seeing this week across the Prairies – including hail, excess moisture and spraying delays. 1. Hail rarely causes yield damage when it occurs at this crop stage. (Choose the correct stage.)Seedling4- to 6-leafFloweringPodding 2. What caused this pinching? CutwormsMoistureSeedling diseaseWind 3. Weather delays can mean sprayer tanks sit full waiting for a return to favourable spraying weather. This increases the risk of contamination, especially when the tank contains glufosinate or glyphosate. Why?They are formulated with strong detergents that act as tank cleaners.These products degrade and no longer work as expected.Formulations with clay carriers settle out quickly after agitation stops.Prolonged exposure to air and light increases the potency. 4. A nitrogen top dress can make financial sense for canola if growing conditions improve after seeding, and yield potential now exceeds the soil nitrogen supply. What is another situation where a top dress could make sense?Saturated soils make it difficult for canola plants to take up nutrients from the soil.Leaf edges are purpling.Yellowing, browning and necrosis occurs in the middle of leaves.Wet soil conditions accelerated nitrogen losses through leaching and denitrification. Loading...
