Scientific Papers Series A. Agronomy

over an area of 10.5 m 2 with a sowing rate of
500 germinating seeds per sq.m. The lot had
previously been planted with sunflowers. The
used fertilization rate was N 6 P 8 K 8.
The laboratory analyses of the grains were
performed at the Central Scientific Laboratory
of the Agricultural University – Plovdiv. The
analysis of raw protein was made on the
grounds of BDS 13490 and the analysis of fats
was made based on BDS 3412 for cereals. The
quantity of starch was established using a
polarographic method.
The content of ß-glucans has been determined
as % of the dry substance through Mixedlinkage
ß-glucan assay kit (Magazyme,
Ireland), based on the enzyme method
published by McCleary and Codd (McCleary
B. V. and R. Codd, 1991). This method has
been approved by AOAC (Method 995.16) and
AACC (Method 32-23). The chaff among the
oat grains was removed by hand after which the
grains were ground in the laboratory mill until
the size of the particles was under 0.5 mm.
The statistical processing of the experimental
data was performed using SPSS V.9.0 for
Microsoft Windows.
RESULTS AND DISCUSSIONS
The vegetation period 2010-2011 was
favourable for the growth of oats.
The frequent and heavy precipitations in
October delayed the sowing and it was
performed at the end of November and the low
average temperatures of 10.8°C, which is 1.8°C
under the norm, delayed the growth of the
plants (Table 1).
The period of tasseling, blossoming and grain
formation was accompanied by heavy
precipitations and the quantity of rainfall in
May and June was above the norm while the
temperatures were close to the typical longterm
ones. The wax ripeness and the overall
ripeness occur under temperatures that are
1.5°C above the norm as well rainfall that is 5.5
mm above the norm. The combination of these
conditions during the period of formation and
ripening of the grains has a positive influence
on some of the quality indicators of the grain
(Table 2).
Table 1. Average diurnal temperatures in periods of ten days (°C), 2010-2011
Months periods of ten days X XI XII I II III IV V VI VII
I 11.6 12.7 7.0 0.2 4.5 0.7 13.0 13.6 22.3 24.0
II 13.2 11.8 -1.8 4.6 2.9 9.2 10.2 17 22.5 26.7
III 7.8 9.5 2.0 -0.6 0.5 10.8 12.2 20.6 22.3 25.5
Average monthly temperature t°C 10.8 11.3 2.4 1.4 2.7 6.9 11.8 17.1 22.4 25.4
Average for the period 1965-1995 12.6 7.4 2.2 -0.4 2.2 6.0 12.2 17.2 20.9 23.2
Table 2. Amount of the rainfall during the vegetation period (mm), 2010-2011
Months periods of ten days X XI XII I II III IV V VI VII
I 27.9 - 4.4 2.7 - 9.9 2.0 31.3 8.6 6.6
II 48.7 11.0 14.4 4.4 28.1 57.8 16.8 8.4 28.6 7.3
III 42.5 4.4 10.2 17.5 24.0 6.7 - 1.1 4.3 0.7
Monthly amounts 119.1 15.4 28.7 24.6 52.1 74.4 18.8 40.8 41.5 14.6
Average for the period 1965-1995 47 35 36 40 48 44 39 32 36 42
Table 3. Average diurnal temperatures in periods of ten days (°C), 2011-2012
Months periods of ten days X XI XII I II III IV V VI VII
I 15.3 7.3 3.4 -0.2 -4.5 4.1 11.2 19.6 21.3 25.9
II 10.6 1.8 5.1 1.5 -3.1 8.1 14.3 16.5 24.6 27.5
III 8.7 2.4 -1.6 -3.0 3.5 13.2 17.7 16.6 24.9 27.5
Average monthly temperature t°C 11.6 3.8 2.3 -0.6 -1.4 8.4 14.4 17.6 23.6 27.0
Average for the period 1965-1995 12.6 7.4 2.2 -0.4 2.2 6.0 12.2 17.2 20.9 23.2
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