ON OPTIMAL DEPTH OF PLANTING PINE SEEDLINGS AT THEIR LANDING ON THE SANDY SOILS IN THE GREEN ZONE OF KYIV



D. F. Brovko, O.F. Brovko, F.M. Brovko

Анотація


It is shown that on sandy soils Scots pine seedlings take root at 83-96%. In
this case, the highest survival rate (96 %) was observed in the seedlings which
were sealed trunks in sand to a depth of 8 cm with simultaneous local application
of a landing slot 0.5 kg loess loam. In the same version, 11-year-old pine
seedlings had dendrometric indicators on 56,0-92,3% higher and accumulated
phytomass at 552.2% more than seedlings, grown at checkout.
Scots pine, sand, survival, seedlings, saplings, phytomass.
On sandy soils that formed as a result of human activities within the green
zone of Kyiv, the survival rate of seedlings of pine in some way affects the depth
of wrapping them in the propagating slot. Thus, planting seedlings with depth of
seal root collar to a depth of 2 cm, as recommended for zonal soils of Polissia,
provides survival rate of seedlings of pine at 82.8 %, and in the case of local slot
propagating in addition loess loam (0.5 kg) survival rate of seedlings growing at 4
% and is 86.2 %. It should be noted that a significant impact on the survival rate
of seedlings of pine was observed in the variant where seedlings immerse
deepest (8 cm), and propagating cranny during planting of loess-like loam. In this
embodiment, seedling survival rate was 16 % higher than in controls and was
96.2 %, higher than the standard rates for the region zonal soil studies (91 %).
Local entering of loam in combination with different depth of planting
seedlings on the second year after the crops on the sands significantly affects
their dendrometric characteristics. In particular, in embodiments where the
propagating crannies of loam in pine seedlings formed larger number of skeletal
roots (4-6) than in controls (3 pcs.). And they were on 8-15 % longer than the
sands where seedlings grown without making loam (29,9±1,35 cm). The
measures affected also on the number and the length of the needle in the 2-year


seedlings of pine. Thus, the plants that grew under control there were 267±14,6
needles, and their average length was 2.6 cm. When making local loam amount
needles increased by 27 % and their length increased by 8 %. The largest
number of needles (404±32,4), while their average length of 3.9 cm was
observed in 2-year seedlings of pine trees, which were planted to a depth of 5
cm. In the embodiment where seedlings immersed in sand to a depth of 8 cm,
lower needles (in sand), shrunken, hence the number of seedlings on seedlings
was 9 % lower than the control and was 243±14,6 pc.
However, needles remaining were 42% longer than controls, indicating that
the formation of the growing plants for better water regime. Height and diameter
of seedlings dominated the controls on 17,4-36,9 % and 10,0-43,3 %
respectively. In pine seedlings grown in the background making local loam as
root mass (at 3,3-41,0 %) and weight of needles (for 29,8-113,8 %) was higher
than in seedlings grown under control and the maximum accumulation of
phytomass (5,01±0,38 g) was observed in seedlings, which immersed to a depth
of 5 cm.
The dendrometric characteristics of seedlings in 11-year-old plantations
were at 56,0-92,3 % higher than the control, in version of the deepest wrapping
(8 cm). However, it should be noted that when grown on sand, in seedlings
breached due to natural features on laying generative buds. In particular, the
plants, the lateral shoots were observed apical buds without lateral buds, lateral
buds with one or two lateral buds and shoots of plants in the central pine with 5
lateral buds, some are lagging behind in development, which indicates the
presence of physiological disturbances in the flow y plant processes. It should
also be noted that the central buds shoots of 11-year-old pine seedlings that
were cultured on sandy soils, there was abundant selection of resin, which is a
visual display of their affection by Pissodes pini L. and indicates a significant
weakening of seedlings growing on sandy soils. The seedlings at control
accumulated the minimum mass (39,14±1,36 g) in 11-year-old plantations.
Significantly higher values of biomass (232,11±4,02 g and 259,17±11,97 g) were
observed in versions, where plants landed a hollow sand to 5 and 8 cm.

So, to provide regulatory survival rate (91-96 %) pine seedlings, improve
dendrometric characteristics and performance (at 40-92 %) and to increase the
accumulation of phytomass (by 360-624 %) on the sandy soils in the researching
region may be due to deep planting them in sand (5, 8 cm) with simultaneous
introduction to local propagating crannies of loess loam (0.5 kg).


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