Absorption, distribution and accumulation of nitrogen applied at different phenological stages in southern highbush blueberry (Vaccinium corymbosum interspecific hybrid)

M.R. LANDRISCINI; 125. PESCIE, M.A., M.P. BORDA, D.P. ORTIZ,; 14.LAVADO, R.S

SCIENTIA HORTICULTURAE

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2018 vol. 230 p. 11 - 17

0304-4238

Southern highbush blueberry has an early harvesting and then a long period of vegetative growth until dormancy,compared to highbush and rabbiteye blueberries. Nitrogen requirements could be different because ofthis specific early harvesting. Absorption of 15N enriched ammonium sulfate was compared at five phenologicalstages from bud swell to pre-dormancy in two years old plants of the cultivars Star and ÓNeal. Plants grown inpots were irrigated with ammonium sulfate solution (15N). Five plants for each application date were excavatedand separated in parts (roots, canes, leaves, flowers, fruits or floral buds). Samples were taken three weeks afterapplication from bud swell to pre-harvest treatment, and three month after for post-harvest and pre-dormancytreatment. Each tissue were dried and weighed before and after, and analyzed for 15N content, N content and N%....N%, and in leaves were also determined macro and micro nutrients. Nitrogen fertilization at bud swell iseffective, even for the ÓNeal cultivarthat present floral bud break in absence of leaves. Post-harvest fertilizationcontribute N for summer vegetativegrowth which would influence the floral buds development next year,Nitrogenstorage at this time would led to the improved floral behavior next year. Nitrogen losses risk is lower atpost-harvestfertilization.