EFFECT OF MANGANESE, COPPER, ZINC AND ALUMINUM APPLICATION RATE ON THE GROWTH AND COMPOSITION OF ‘WOODARD’ RABBITEYE BLUEBERRY

The growth responses of ‘Woodard’ rabbiteye blueberry (Vaccinium ashei) to Mn, Cu, Zn and Al were studied using solution culture.
The Mn, Cu, Zn and Al were each applied at two concentrations: Mn 1 and 2, Cu 0.10 and 0.20, Zn 0.25 and 0.50, Al 65 and 130 ppm.
The N source (24 ppm) was NH₄NO₃ in experiment 1. In experiment 2, the Al application rate was changed to four levels, 0, 16, 32 and 64 ppm, and three N sources (58 ppm), (NH₄)₂SO₄, NH₄NO₃ and NaNO₃ were tested.

The top growth was largest in the control treatment (Mn=0.2, Cu=0.02, Zn=0.05 and Al=0ppm). However, the root growth was best in the Alx5 treatment (Al=65ppm) in experiment 1. Increasing the Mn, Zn, and Al application rates, caused a reduction in top and root growth.
Symptoms similar to Fe deficiency appeared on the leaves of each treatment.

In experiment 2, the effect of Al rates on the growth differed with the N source; the NH₄NO₃ Al-32 ppm treatment resulted in the best growth.
The top and root growth was superior with NH₄NO₃ and was inferior with NaNO₃.

The different rates of Mn, Cu, Zn and Al application, and the different N sources affected the element concentration in leaves and roots.

VI International Symposium on Vaccinium Culture

T. Tamada

Vaccinium ashei, plant nutrition, diagnosis of nutrient condition, nitrogen forms, heavy metal, Japan

https://doi.org/10.17660/ActaHortic.1997.446.70