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Interpretive Summaries:
Soil and foliar potassium fertilization of cotton, 1997
Four rates of KCl (0,50,100,150 lb/A) were applied to the soil pre-plant incorporated and as split applications with half at planting and half side-dressed at first bloom. KNO3 at 2,4,and 6 lb/A was foliar applied at each rate at first bloom and then weekly vs. at 3,5 and 7 weeks after first bloom. Over a three year period, potassium applied pre-plant to the soil increased lint yield by 115 lb/A (150 lb/A in two of the three years). Lint yield response was increased by 138 lb/A when the K rates were split with half applied pre-plant and the remainder at first bloom. Weekly foliar K applications did not improve lint yield over soil application treatments in two of the three years. However, in the third season, the 4 lb/A KNO3 treatment increased lint yield by 175 lb/A indicating the importance of plant available K at the time of boll filling and that response to foliar applied K is crop season specific. Georgia scientists reported no differences in lint yields were noted between N rates. The greatest yield was obtained with 1 lb/A B treatment. No interaction was noted between B and N. Lint yields in the study ranged from 1070 to 1138 lb/A. VA-10F
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