Submitted to: Agronomy Society of America, Crop Science Society of America, Soil Science Society of America Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 7/30/2003
Publication Date: 11/4/2003
Citation: Evans, K.M., Riedell, W.E. 2003. Physiological basis for chloride response in spring wheat varieties. Poster presentation, Annual Meeting, American Society of Agronomy, November 2-6, 2003, Denver, CO.
Technical Abstract: The physiological basis for hard spring wheat varietal response to chloride fertilizer under field conditions is not understood. Our research investigated chloride nutrient relations of small grain varieties ('Butte', 'Ember', 'Forge', 'Guard', 'Ingot', 'Marshall', 'Oxen', 'Russ', and 'Sharp') under controlled environments. Plants were grown in sand culture with +/- additional chloride (+/- 20 mM KCl) nutrient solutions or with different levels of chloride (0, 20, 80, 160 mM KCl) for four weeks. In plants given +/- additional chloride, 'Butte', 'Sharp', 'Ingot', 'Oxen', 'Forge', and 'Ember' had significantly greater shoot chloride response than 'Marshall'. 'Butte' had a lower initial chloride concentration than 'Marshall' (at the 0 KCl treatment level), but at other KCl treatment levels (20, 80, 160 mM), 'Butte' had higher leaf chloride levels than 'Marshall'. In soil-grown plants given 0, 20, 80, 160 mM KCl from planting to heading, seed number remained constant while individual seed weight and total yield decreased at higher KCl treatment levels in 'Butte'. In 'Marshall', individual seed weight remained constant while seed number and total yield increased. We conclude that chloride fertilizer response in 'Marshall' seen under field conditions may be mediated by reduced chloride uptake which in turn results in decreased salt injury at higher chloride soil fertility levels.