RESPONSE OF CROP PLANTS TO I AND BR

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Abstract
Application of KI were made to 9 New Jersey soils, and tomatoes were used to test the effect of the added I. Residual effects of the I additions were studied on buckwheat as a test crop. A preliminary test was made of the effect of Br additions. I-Cl and I-Br relationships in tomatoes were studied by use . of solution-culture procedures. Yield responses were not obtained with tomatoes on any of these soils when I was applied at rates of 1 and 10 lb. an acre. I at the 1 lb. rate had no effect on the growth of tomatoes on the soils, but at the 10 lb. rate it was toxic to tomatoes on the Norton, Lawrenceville, Washington, and Lakewood soils. Addition of Cl as KC1 tended to increase toxicity symptoms of I in soil cultures and also to increase I uptake by tomatoes and buckwheat. Residual effects of the initial I applns. were observed on the yield and I content of buckwheat from several soils. Yield responses from Br applns. at rates of 50 and 100 lbs. an acre were not obtained on 5 typical New Jersey soils. I-Cl antagonism was not observed in tomatoes in either soln. tests or soil tests. I uptake was increased by addition of Cl, but no effect of I on Cl uptake was observed. I-Br antagonism was not observed in soln. cultures, although Br seemed to increase Cl uptake. The Br content of leaflets of tomatoes grown in the tests ranged from less than 4 to 2825 ppm. depending on the amt. of Br present in the nutrient soln.

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