The effect of intensity of nutrient supply on growth,yield and leaf composition of black currant grown in sand culture

Black currants were grown from cuttings in sand culture to study the effect of intensity of nutrient supply on growth, yield and leaf composition of the plants. An increase in frequency of nutrient supply gave an increase in the amount of fruiting wood produced in 1966 and in the yield of fruit in 1967. Leaf phosphorus concentrations ranged from 0·48-1·61% as the intensity of nutrient supply increased; fractionation of phosphorus in leaf samples showed that the largest part of this variation was accounted for by differences in the inorganic phosphate content of the leaf. Leaf concentrations of N, K, Ca, Mg, Fe, Cu, Mn and Zn were little affected by the experimental treatments.