Volume 02 Issue 05-2022
6
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
02
I
SSUE
05
Pages:
06-12
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
A
BSTRACT
The foreign Ento-Dephol showed a high result when cotton causes open 30-40% while using 0.200 litres
of defoliation for each hectare in order to defoliate cotton artificially.7.0 litres use of defoliation gave better
result regarding the other alternatives.
K
EYWORDS
Types of defoliation and defoliants, cotton leaves dry and semi-dry leaves.
I
NTRODUCTION
It is known that our country is located in the
northernmost part of the globe among the cotton-
growing countries of the world, and hot or rainy
weather in the spring months is late, and cool and
Journal
Website:
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Copyright:
Original
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may be used under the
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commons
attributes
4.0 licence.
Research Article
EFFECTIVENESS OF FOREIGN AND LOCAL DEFOLIANTS ON
THE OPENING OF CUPS
Submission Date:
April 27, 2022,
Accepted Date:
May 07, 2022,
Published Date:
May 18, 2022
Crossref doi:
https://doi.org/10.37547/ijasr-02-05-02
Ubaydullaev M.M.
Doctor of Philosophy in Agricultural Sciences, Head of the department, Fergana Polytechnic Institute,
Fergana, Uzbekistan
Mahmutaliyev I.V.
Master student, Ferghana Polytechnic Institute, Fergana, Uzbekistan
Volume 02 Issue 05-2022
7
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
02
I
SSUE
05
Pages:
06-12
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
rainy days in the autumn months begin very early
[1-3]. Therefore, the cultivation of raw cotton
requires the use of advanced technologies and
diligence. Therefore, defoliation of cotton used for
early harvest is important to ensure that the
cotton buds open as soon as possible. In recent
years, several defoliants have been registered
with the State Chemical Commission for cotton
defoliation and approved for use in production
[4-7]. For the most part, these are local
preparations that are now widely used in
production. However, since the active substance
of these local defoliants consists mainly of
chlorate salts, a rapid, i.e. strong, effect on the
plant is observed. To reduce this problem, in
recent years several drugs have been imported
into our country and abroad that have a mild
effect on cotton, belonging to the phenylurea
group, consisting of thidiazuron-diuron. Testing
the effectiveness of these new foreign defoliants
is one of the most urgent problems today [8-11].
R
ESEARCH METHODOLOGY
According to current tasks, in 2018-2020, our
research will be carried out at the Scientific and
Experimental Station of the Research Institute of
Cotton Growing, Seed Growing and Agricultural
Technology of the Kuva district of the Fergana
region. Groundwater was carried out in soil
conditions to a depth of 1.6-1.8 meters [12-17]. In
the experiment, 8 variants of each variety were
obtained and placed in 3 repetitions.
Experimental variants of cotton varieties C8290
and C6775 were used at opening times of 30-40%
and 50-60% of the established norms of the above
defoliants and their optimal norms and terms of
application were determined. bread machine"
(1981), "Methodology for conducting field
experiments" (2007) and "Methodology for
testing cotton defoliants" (2007), adopted by the
State Chemical Commission of the Republic of
Uzbekistan [18-21].
R
ESEARCH RESULTS AND DISCUSSION
According to the results of phenological
observation and analysis, the S-8290 cotton stalks
cultivated on the meadow soils of Ferghana are in
the control variant for defoliation (not defoliated)
at 30-40% of the opening time. After 14 days, the
number of open cocoons was 67.3%, half-open
cocoons 1.8%, and cocoon opening process
32.5%.
As a guideline, the number of holes opened 14
days after defoliation in the studied variant using
liquid CMD defoliant at a rate of 8.0 l/ha in this
area was 79.9%, half-open 1.5%, opening rate
43.2%, which is 10.7% higher than in the control.
The highest results on the effect of defoliants on
the opening of cotton buds were obtained when
using the defoliant EntoDefol at a dose of 0.200
l/ha, the opening of buckets was 85.8%, the half-
opening was 1.4% and the opening rate was
50.0%, which is 17.5 % higher than in control.
Also in the variants with the standard defoliant
FanDEF-excellent 7.0 l/ha, cocoon opening was
82.9%, semi-open 1.0%, and the opening rate was
47.6%. % higher than the standard (Liquid XMD
Volume 02 Issue 05-2022
8
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
02
I
SSUE
05
Pages:
06-12
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
8.0 l/ha), the pore opening was 3.0% higher and
the opening rate was 4.4% higher.
Figure 1. Effect of defoliants on the opening and opening speed of cotton buds in the cotton variety C-8290.
Against the second background of experience, i.e.
in the period of 50-60% opening of S-8290, the
results of the analysis showed that the number of
openings after 14 days in the control variant was
73.1%, half-open 1.0%. the percentage of opening
of the bags was 16.9%, which is confirmed by the
analysis. According to the experimental system, in
the variant using the standard (Liquid XMD 8.0),
there were 85.0% opened cocoons, 0.9% half-
opened and 30.4% opening rate. The best results
in the experimental variants were noted on the
EntoDefol defoliant variant using a high dose of
0.150 l/ha, the open rate reached 95.1% after 14
days of defoliation, the open ratio was 38.7%.
During the same period, the cup opening rate
increased by 21.8-8.3%, respectively, compared
to the control and standard (Liquid XMD 8.0).
Opening of cocoons was achieved with high
efficiency on the defoliant variant FanDEF-
excellent at a rate of 6.0 l/ha and a degree of
opening of 31.2%. During this period, the cup
opening rate increased compared to the control
and standard (Liquid XMD 8.0), by 14.3-0.8%,
respectively. It should be noted that the opening
and speed of cotton variety S-8290 increased
slightly with the use of EntoDefol defoliant at a
high rate of 0.200 l/ha at an opening of 30-40%.
In the subsequent period (50-60%), high results
were observed when using the defoliant
EntoDefol at an average of 0.150 l/ha. It can be
concluded that low levels of defoliants also have a
positive effect on the morphophysiological
maturity of cotton buds [22-26].
Also in the experiment, the number of cotton buds
of the second grade C-6775, which opened after
14 days in the background control variant with
opening times of 30-40% and 50-60%,
respectively, was 64.3-71.9%. half of the openings
Volume 02 Issue 05-2022
9
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
02
I
SSUE
05
Pages:
06-12
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
were 3.5%-1.5%, and the section opening ratio
was 30.2-19.8%.
Figure 2. Influence of defoliants on the opening and opening speed of cotton buds in the cotton
variety C-6775
In the variant with the use of the standard
defoliant (Liquid XMD 8.0), in accordance with
the opening time of cotton buds, open buds were
76.2-85.1%, half-opened buds - 2.1-0.7%, and the
opening rate was 41.6-31 .7. % and the difference
in the opening speed with the control was 11.4–
11.9%. High results in the experiment were
0.200-7.0% of the defoliant EntoDefol and
FanDEF-excellent in proportion to the opening
time of the cups (30-40; 50-60%); Obtained from
the used options at the rate of 0.150-6.0 l/ha. This
means that the number of cocoons opened 14
days after defoliation is 84.8-81.3%, respectively;
94.2-89.9%, disclosure rate 49.3-48.2%; 40.6-
34.8%, semi-open cups 2.0-1.6%; 0.9-1.1%.
During this period, the opening rate of the cups
was higher than the control and the standard
(Liquid CMD 8.0 l/ha) and, accordingly (30-40%)
19.1-7.7%; 13.9-2.5%, (50-60) 20.8-15.0%;
Increased by 8.9-3.1%.
F
INDINGS
Thus, the effect of defoliants on the opening of
cotton buds was effective in both varieties. In
other words, cotton varieties S-8290 and S-6775,
which are being tested, are most open to cotton
with a defoliation period of 30-40 and 50-60%. by
0.150-0.200 l/ha and defoliant FanDEF-excellent
by 6.0-7.0 l/ha. Thus, to obtain a fabulous, high-
quality cotton crop from cotton varieties C-8290
and C-6775 cultivated in the pasture soils of the
Fergana region, and to increase the efficiency of
defoliation when they are adapted to manual and
-20
0
20
40
60
80
100
-2
0
2
4
6
8
10
opening of cotton buds
дефолиациядан олдин
Очилган кўсаклар, %
дефолиациядан олдин
дефолиациядан 7 кундан
сўнг Очилган кўсаклар, %
дефолиациядан олдин
дефолиациядан 7 кундан
сўнг Очилиш тезлиги,%
дефолиациядан 14 кундан
сўнг Очилган кўсаклар, %
дефолиациядан 14 кундан
сўнг Очилиш тезлиги,%
Volume 02 Issue 05-2022
10
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
02
I
SSUE
05
Pages:
06-12
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
machine harvesting, use the new defoliants
EntoDefol and FanDEF-excellent to get a quality
crop without increasing the cost:
•
Cotton varieties C-8290 and C-6775 have
defoliant EntoDefol at a dose of 0.200 l/ha
and defoliant FanDEF-excellent at a dose
of 7.0 l/ha with an opening of 30-40%;
•
it is recommended to use defoliant
EntoDefol at the rate of 0.150 l/ha and
defoliant FanDEF-excelling at the rate of
6.0 l/ha at 50-60% opening of cotton
varieties.
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