Influence of P, K, Ca, and Mg rates on leaf elemental concentration and plant growth of 'dormanred' raspberry

摘要

'Dormanred' raspberry plants were grown in sand culture for two years and fertilized with solutions consisting of five macro nutrients (N, P, K, Ca, and Mg) applied at three different rates (0 Mg/l, control and 10X control). Foliar samples were collected at 4, 8 and 16 weeks after treatment initiation during the second growing season. The 10X N rate resulted in high leaf concentrations of Fe but lower leaf concentrations of Ca and Mg. High P rates increased leaf P, K, and Cu but inhibited Ca uptake. The 10X K rate inhibited Ca and Mg uptake but increased the leaf contents of P, K, Fe, and Cu. High Ca fertilization increased P leaf content and decreased the uptake of Mg and Mn. The 1 OX rate of Mg increased leaf Mg content but reduced the leaf content of Ca. Toxicity and deficiency symptoms were more evident with the N, K, and Mg fertilizer treatments.