sodininkystė ir daržininkystė 25(4)

Tree vigour. Tree vigour as measured by trunk cross-sectional area at the end
of the eight growing season was significantly affected by rootstocks. P 8–13 produced
the largest trees for both cultivars and was 25% larger than St. Julien A on
‘Opal’ and 7% larger on ‘Reine Claude’. The smallest trees were produced on Ferlenain
for the cultivar ‘Opal’ and on Fereley for ‘Reine Claude’ (Tables 3 and 4).
These rootstocks gave significant smaller trees on both cultivars compared with the
standard St. Julien A.
Table 4. Effect of rootstocks on trunk cross sectional area, cumulative yield, cumulative
yield efficiency, average fruit weight, soluble solids and tree survival for the cultivar
‘Reine Claude GF 1119’ at the end of the eight growing season
4 lentelë. Poskiepiø átaka slyvø veislës ‘Reine Claude GF 1119’ kamieno skerspjûvio
plotui, suminiam derliui, suminiam produktyvumui, vidutinei vaisiaus masei, tirpioms
sausosioms medþiagoms ir vaismedþio iðlikimui aðtuntojo augimo sezono pabaigoje
Rootstock
Poskiepis
Trunk
crosssectional
area
Kamieno
skerspjûvio
plotas,
cm 2
Cumulative
yield (kg
per tree)
Suminis
derlius,
kg medis -1
Cumulative
yield
efficiency
Suminis
produktyvumas
, kg cm -2
Mean
fruit
weight
Vidutinë
vaisiaus
masë, g
Soluble
solids
Tirpios
sausosios
medžiagos,
%
Tree
survival
Vaismedžio
išlikimas, %
Ferlenain 63.7 14.2 0.276 23.1 22.3 80
Ferciana 84.6 10.1 0.155 22.8 20.1 100
Fereley 60.5 10.1 0.211 20.3 19.3 100
P 8-13 85.8 9.8 0.156 21.5 18.7 83
St. Julien A 80.3 9.1 0.143 20.8 20.5 100
LSD. P = 0.05% 14.5 2.0 0.037 NS 2.9 -
Yield. The first minor crop was harvested in the third leaf for the cultivar ‘Opal’,
which was the most productive cultivar. It gave three times larger crop than ‘Reine
Claude’ on the average for the six cropping years. The ‘Reine Claude’ trees came
two years later into production than ‘Opal’. The harvest time for ‘Opal’ was the
second half of August depending on the years and ‘Reine Claude’ one month later.
For ‘Opal’ the rootstock St. Julien A came slower into production than the other
rootstocks. There were rather small differences between the different rootstocks in
productivity: However, the rootstock Ferlenain produced significant larger crop than
the other rootstocks for ‘Reine Claude’ and lower for ‘Opal’.
Yield efficiency. Yield efficiency was calculated for each rootstock on the basis
of yield and trunk cross sectional area. Trees on Fereley were the most yield efficient
for ‘Opal’ and Ferlenain for ‘Reine Claude’. The Ferlenain rootstock was the
least efficient for ‘Opal’ and St. Julien A for ‘Reine Claude’. In general the efficiency
reflected the yields obtained.
Fruit quality. Important quality components like fruit weight and soluble solids
were not much influenced by the different rootstocks. The rootstocks did not have
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