Abstract:
Natural organic complex
fertilizers of boron are bioactive substances,
having many biological activities, especially
properties of increasing metabolic activity
and production. The obtained results in the
Redhaven peach variety have shown the
favourable effects of treatments on fruit tree
growth and development according to the
phenological phase and the number of
treatments. The chlorophyll content (a+b)
has increased once with the number of
treatments, while the highest values were
obtained at the stage of shoot maturation, at
the variant fertilized with complex boron, 5
l/ha, in four treatments (5.99 mg/g fresh
matter). The determinations on the NPK
content of leaves at the stage of intense
shoot growth pointed out better results at the
variants treated with natural complex
fertilizers of boron, where four treatments
were applied (3.06%Nt, 0.64%Pt, 1.63%Kt
at the variant treated with complex boron, in
four treatments). The DM content of leaves
has shown higher values at all the variants
where natural complex fertilizers of boron
were applied. It also increased once with the
number of treatments. The best results were
obtained at the variants treated with
Cupribor and Boron complex, in four
treatments (41.23%). At all the studied
variants, the DM quantity accumulated in
leaves through photosynthesis was higher at
the variants treated with natural complex
fertilizers of Boron in four treatments
(43.7mg DM/dm2/8h at the variant treated
with Cupribor and 47.2mg DM/dm2/8h at
the variant treated with Boron complex). As
concerns the fruit production, there were
significant yield increases at all the variants
fertilized with Boron, but the best results
were obtained at the variants where four
treatments with Folibor (12.2t/ha) and
Boron complex (11.5t/ha) were applied. The
fruit quality was favourably influenced by boron. The obtained fruits had a higher
content of DM, glucose, vitamin C and a
lower content of nitrates.
