Abstract
Abstract Effects of day/night temperatures of 28°/16° and 28°/8°C, low and high water stress in the rooting medium, and several ammonium and nitrate sources on apparent ammonium toxicity in plants of ‘Honey Gold’ and ‘Spring Green’ snap beans (Phaseolus vulgaris L.) were evaluated in controlled environments. Apparent ammonium toxicity, in terms of visible injury and reduced plant height and weight, was generally accentuated by high water stress prior to application and to a lesser extent by cooler night temperature. ‘Spring Green’ was more sensitive than ‘Honey Gold’ to apparent ammonium injury. At equimolar concentrations, added (NH4)2SO4 was generally more injurious than added NH4NO3.
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