N AND P FERTILIZERS, SOME GROWTH VARIABLES, AND MYCORRHIZAE IN WILD
N and P are among the fertilizers widely used by wild blueberry (Vaccinium angustifolium) producers to improve growth and yield. Although extensive research has been done on fertilizers applications to wild blueberry fields, insufficient information was available on the beneficial effect of the fertilizers on wild blueberry growth and yield. Mycorrhizal associations are a substantial component of the blueberry ecosystem and may benefit growth and nutrition of the wild blueberry, but very little is known about fertilizer effects on mycorrhizal associations. The purpose of this study was to investigate the effects of N and P on some morphological variables of wild blueberry and associated ericoid mycorrhizae. N and P, singly and in combination, were applied to wild blueberry field in the vegetative phase of production in spring 2001. A factorial combination of the treatments with five replicates (N, 0 and 35 kg N/ha in the form of urea 46-0-0; P, 0 and 60 kg P205/ha in the form of triple superphosphate 0-46-0) were applied to each of 5 x 10 m plot. Whole plant samples (squares of 16 x 16 cm and depth of 10 cm) were collected in July and August and mycorrhizal infection, stem density, stem dry weight, stem length, root dry weight, rhizome dry weight, and vegetative nodes were recorded. For this presented stage of the study, the treatments showed no significant effect on any of the studied variables. In a separate experiment, the combination effects of N, P, and K, in the form of ammonium sulphate, superphosphate, and murate of potash, respectively, on the mycorrhizal infection of wild blueberry in cropping stage of production were investigated. N, P, and K were applied at 0, 30, and 60 kg/ha in several different combinations. Mycorrhizal infection levels did not differ among the studied treatment combinations.
Jeliazkova, E.A. and Percival, D.C. (2003). N AND P FERTILIZERS, SOME GROWTH VARIABLES, AND MYCORRHIZAE IN WILD. Acta Hortic. 626, 297-304
ericoid mycorrhizae, ammonium nitrogen, ammonium sulphate, urea, triple superphosphate, murate of potash