Abstract:
This experiment was
conducted in a private orchard (Kosar) in
district of Shahriar of Alborz province
(Iran), during 2012-2013, to determine the
effects of B and Zn applied on flowers at
full bloom stage on leaf macro and
micronutrient contents at 90 days after full
bloom (DAFB) of three pear cultivars
(Spadona and Duchesse and a pear cultivar
from Iranian national collection, named as
Daregazi). The deviation from the optimum
percentage (DOP) index of macro and
micronutrients for two studied years was
used to evaluate the nutritional status:
optimal (DOP = 0), deficiency (DOP < 0) or
excess (DOP > 0). The ΣDOP for two
studied years is obtained by adding the
values of DOP index irrespective of sign.
The larger the ΣDOP, the greater is the
intensity of imbalances among nutrients. In
general, a DOP value close to the optimum
level (DOP = 0) were observed in treated
studied pear cultivars with B and Zn applied
on flowers at full bloom stage compared
with the control trees (without any
application of boron and zinc). The
DOPmacro and DOPmicro were, respectively,
positive and negative for all of studied pear
cultivars regardless of treatments.
According to £DOP index (during 2012-
2013), the combination of both products
(borax+zinc sulfate treatments) at full
bloom stage applied on flowers of three pear
cultivars (Spadona, Duchesse and Daregazi)
showed better balanced nutritional values
than the rest of treatments.
