Volume 02 Issue 05-2022
18
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
02
I
SSUE
05
Pages:
18-22
SJIF
I
MPACT
FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
ABSTRACT
The new Ento-Dephol showed a high result when cotton causes open 30-40% while using 0.20 litres of defoliation for
each hectare to defoliate cotton artificially.7.0 litres use of defoliation gave better results regarding the other
alternatives.
KEYWORDS
Types of defoliation and defoliants, cotton leaves dry and semi-dry leaves.
INTRODUCTION
It is known that the amount of defoliants used in
cotton has a negative effect on the quality of fibre and
seeds if it is exceeded, but if it is used in small amounts,
it does not give the expected effect, ie the cost is
wasted [1-7]. With this in mind, the development of
acceptable standards for new defoliants is a pressing
issue. In this regard, the President of the Republic of
Uzbekistan Sh.M.Mirziyoev on August 21, 2017, No. PQ-
Research Article
DETERMINATION OF APPROPRIATE NORMS AND TERMS OF
DEFOLIANTS
Submission Date:
April 27, 2022,
Accepted Date:
May 07, 2022,
Published Date:
May 18, 2022
Crossref doi:
https://doi.org/10.37547/ajast/Volume02Issue05-04
Ubaydullaev M.M.
Doctor of Philosophy in Agricultural Sciences, Head of the department, Fergana Polytechnic Institute, Fergana,
Uzbekistan
Toyirov. U.T.
Assistant, Fergana Polytechnic Institute, Fergana, Uzbekistan
Journal
Website:
https://theusajournals.
com/index.php/ajast
Copyright:
Original
content from this work
may be used under the
terms of the creative
commons
attributes
4.0 licence.
Volume 02 Issue 05-2022
19
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
02
I
SSUE
05
Pages:
18-22
SJIF
I
MPACT
FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
3229 "On comprehensive organizational measures for
the timely and effective conduct of cotton defoliation
in 2017" on the non-destructive harvesting of cotton
grown this year», The measures for the quality of
cotton defoliation are clearly indicated [8-11]. From this
point of view, it is important to develop standards for
the use of new mild-acting defoliants, taking into
account the sharp differences in the properties of
defoliants created in recent years, climate change and
mechanization of harvesting operations. Research
methodology. Based on the above current tasks, our
research on the topic for 2018-2019 will be carried out
at the Scientific Experimental Station of the Research
Institute of Cotton Breeding, Seed Production and
Agrotechnology in the Kuva district of the Fergana
region. Was carried out in soil conditions at a depth of
-1.8 m [12-19].
MATERIALS AND METHODS
In the experiment, 8 variants were obtained for each
variety and placed in 3 iterations. In the selected
variants of cotton varieties, S8290 and S6775 in the
period of 30-40% and 50-60% of the time of opening the
above criteria of the above defoliants were applied,
and the optimal norms and duration of their use were
determined. Methods of conducting field experiments
”(2007) and“ Guidelines for testing cotton defoliants
”adopted by the State Chemical Commission of the
Republic of Uzbekistan (1993, 1994, 2004) [20-25].
Research results. Observations and analyzes showed
that the background defoliation was not carried out
when defoliating S-8290 cotton stalks at 30-40%
opening time, ie in the control variant, the natural
shedding of leaves 14 days after defoliation was 7.5%,
and green leaves 88.7%. In the variant of liquid chlorate-
magnesium defoliant used as a standard at the rate of
8.0 l / ha, it was found that after 14 days of defoliation,
about 78.5% of cotton leaves were shed. The highest
results in Ento-Defol defoliant were observed in the
case of cotton leaf shedding of around 87.5% after 14
days of defoliation in the variant used at the rate of
0.20 l / ha. It should be noted that the defoliation
efficiency of the new Ento-Defol defoliant at the rate
of 0.20 l / ha compared to the control variant and Liquid
XMD defoliant (8.0 l / ha) at the time of opening of
cocoons of S-8290 cotton variety by 30-40%. it became
clear that more leaves had fallen. In the study, the
highest results were obtained in the variant of FanDef-
excellent defoliant at the rate of 7.0 l / ha.
When defoliation of the second S-6775 cotton variety
in the experiment was carried out at 30-40% opening, it
was noted that in the Control variant of the
background, the natural shedding of leaves after 14
days of defoliation was 9.9% and green leaves 86.7%
[24-27]. In the variant of liquid chlorate-magnesium
defoliant used as a standard at the rate of 8.0 l / ha, up
to 75.5% of cotton leaves were shed 14 days after
defoliation.
Volume 02 Issue 05-2022
20
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
02
I
SSUE
05
Pages:
18-22
SJIF
I
MPACT
FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
Fig. 1. When 30-40% of C8090 cotton stalks are opened.
The highest results in Ento-Defol defoliant were
obtained with 0.20 l / ha in the supported variant, Up
to 2.3% of the leaves were preserved in a semi-dried
cotton bush.
Fig. 2. Fig. 1. When 30-40% of C6775 cotton stalks are opened.
It should be noted that in the variants of this new Ento-
Defol defoliant used at the rate of 0.20 l / ha, the
defoliation efficiency was higher than that of the
Control variant and the Liquid XMD defoliant (8.0 l /
ha). Based on the results of scientific research
conducted in the conditions of grassland soils of the
Fergana region, the following conclusions can be
made.
CONCLUSION
Studies have shown that in the variant of Ento-Defol
defoliant applied to 0.20 l / ha when the buds of the S-
8290 cotton variety were opened by 30-40%, more leaf
shedding was affected. It was also found that leaf
shedding was also high in the variant where Fan Def-
excellent defoliant was used at a rate of 7.0 l / ha. The
Volume 02 Issue 05-2022
21
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
02
I
SSUE
05
Pages:
18-22
SJIF
I
MPACT
FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
rate of 0.20 l / ha of Ento-Defol defoliant and 7.0 l / ha
of FanDEF-excellent defoliant had a high effect on leaf
shedding even when the S-6775 cotton buds were
opened by 30-40%.
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