Agriculture Reference
In-Depth Information
5.3 RESULTS AND DISCUSSIONS
As our researches show (Table 5.1), the time of emergence of seedlings and further
approach of growth phases and development of potato plants depend on the biologi-
cal features of cultivars, the agrotechnical methods, and the weather conditions that
developed during the vegetation period.
TABLE 5.1
Phenological observations for various cultivars during different time of planting
Volzhanin
Vladikavkazsky
Predgorny
Time of
planting
1
20
38
43
23
42
46
19
36
40
2
17
36
40
20
40
43
16
34
37
3
14
33
37
17
37
39
13
31
33
First, seedlings appeared depending on the early ripening of a cultivar.
According to all planting times, we noted that the emergence of seedlings of culti-
var predgorny occurred 2-3 days earlier than cultivar Volzhanin and 3-6 days earlier
than cultivar Vladikavkazsky.
It is revealed that when the later planting was performed, the higher was the tem-
perature of the soil; thus, the emergence of both seedlings and other phases of develop-
ment of potato plants began earlier.
The bush of potato plant consists of several rather autonomous stalks, whose quan-
tity is a varietal
sign. As a rule, there is a positive dependence between the number of
stalks and quantity of the formed tubers; however, a direct link is quite often absent.
Our studies revealed that potatoes cultivars had unequal quantity of the main stalks in
a bush. According to Table 5.2, this sign depends on the cultivar biology. Special changes
from time of planting have not been noted—0.3-0.6 piece/bush in every cultivar.
TABLE 5.2
Number of stalks and height of plants in dependence on the cultivar and time of
planting in phase of flowering
Volzhanin
Vladikavkazsky
Predgorny
Date of
planting
Height
of plants
(cm)
Number
of stalks
Height of
plants (cm)
Number of
stalks
Height of
plants (cm)
Number
of stalks
1
3.4
57
4.0
59
4.0
60
2
3.6
53
4.2
57
3.9
59
3
3.5
50
4.0
51
3.7
53
Note: 1—15.04; 2—25.04; 3—05.05
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