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Abstract
Foliar K applications were evaluated on adult pecan trees [Carya illinoensis (Wangenh.) C. Koch.] in four separate experiments using various rates and timings of either K2SO4 or KNO3. Ammonium nitrate and/or urea also were used to enhance K absorption. Results indicated that foliar K applications using either K2SO4 or KNO3 were not effective in supplying K to the trees. Leaf K concentration, nut size, kernel percent, and yield, in most cases, did not respond to the treatments. Neither NH4NO3 nor urea improved K absorption.
Abstract
Vegetative and fruiting shoots were tagged in Oct. 1982 and 1983 on ‘Squirrel’, ‘Stuart’, and ‘Cape Fear’ pecan trees [Carya illinoensis (Wangenh) C. Koch], and flowering was determined the following years. One-year-old shoots were sampled from vegetative and fruiting shoots of each cultivar on 14 Oct. 1982, 9 Feb., 11 Apr., 14 Oct., and 24 Nov. 1983, and 6 Jan. and 17 Apr. 1984 and analyzed for reducing and nonreducing sugars and starch concentrations. Fruiting reduced return bloom of ‘Cape Fear’ in 1983 and 1984, and ‘Stuart’ in 1983. Sugar and starch concentrations varied inversely. Sugar concentrations were increased in November, January, and February, and starch concentrations were greatest during October and April. The total carbohydrate concentration in fruiting shoots of each cultivar was greater or equal to that of vegetative shoots in all but one instance. The degree of return fruiting was positively associated with cultivars with early fruit ripening dates.