ISHS Acta Horticulturae 446: VI International Symposium on Vaccinium Culture
INFLUENCE OF N, P, K, CA AND MG RATES ON LEAF ELEMENTAL CONCENTRATION AND PLANT GROWTH OF 'GULFCOAST' BLUEBERRY |
| Authors: | John H. Braswell, Frank B. Matta, James M. Spiers |
| Keywords: | Vaccinium corymbosum, Southern highbush blueberry, Plant nutrition |
| Abstract:
‘Gulfcoast’ southern highbush blueberry 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 two growing seasons. The 10X N rate resulted in high leaf concentrations of N and P and inhibited the uptake of K and Mg. Visual symptoms attributed to P were not readily apparent until the second year. High P rates increased leaf P but inhibited Cu, Fe and Zn uptake. The 10X Mg rate inhibited Mg and Zn uptake. Calcium deficiency symptoms were not readily apparent until the second year but toxicity symptoms occurred the first year. The 10X Mg rate increased Mg uptake but inhibited Zn uptake. Magnesium deficiency symptoms were readily apparent the first year while toxicity symptoms did not become apparent until the second year. | |
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