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Influence of N, P, K, Ca, and Mg Rates on Leaf Macronutrient Concentration of 'Navaho' Blackberry
- Spiers, J.M., Braswell, J.H.
- Acta horticulturae 2002 no.585 pp. 659
- Rubus plicatus, blackberries, plant nutrition, nutrient content, fertilizer application, elements, soil nutrients, nitrogen fertilizers, phosphorus fertilizers, potassium fertilizers, calcium fertilizers, magnesium fertilizers
- 'Navaho' blackberry 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 N and P but lower leaf concentrations of K, Ca, and Mg. High P rates increased leaf P only. The 10X K rate inhibited Ca and Mg uptake but increased the leaf contents of K. High Ca fertilization increased Ca leaf content and decreased the uptake of Mg. The 10X 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.