Abstract
Weeds are major obstacles in the successful cultivation of cotton. Many weeds have fast growth; hence they offer severe competition with crops especially in the initial stage. Manual weeding is time-consuming, expensive and tedious. A judicious combination of chemical and cultural methods of weed control seems necessary for effective control of weeds and for the best possible utilization of costly inputs which would ultimately result in higher yields. Therefore, a field experiment was planned and conducted at Agronomy Instructional Farm, Chimanbhai Patel College of Agriculture, Sardarkrushinagar Dantiwada Agricultural University, Sardarkrushinagar, Gujarat (India) during kharif 2022 to study the “Effect of weed control treatments on weeds and physiology of Bt cotton grown under North Gujarat agroclimatic conditions of India” on loamy sand soil. The experiment was conducted in a randomized block design with three replications and ten treatments. The Bt cotton variety GTHH 49 was sown manually at a row-to-row distance of 120 cm and 45 cm between plant to plant. Different weed control treatments significantly affected the dry weight of total weeds across the crop growth stages. After weed free plot, the minimum dry weight of total weeds at 25 and 50 DAS was observed under pendimethalin 1000 g/ha as PE + pyrithiobac sodium + quizalofop ethyl 100 (60 + 40) g/ha as PoE at 25 DAS (T 5 ). After weed free plot, the dry weight of total weeds at 75 DAS was found minimum under pyrithiobac sodium + quizalofop ethyl 100 (60 + 40) g/ha as PoE at 25 DAS + IC fb HW at 50 DAS (T 8 ), which had significantly reduced the dry weight of total weeds compared to all other treatments except weed free plot. The maximum dry weight of total weeds at 25, 50, and 75 DAS was observed under a weedy check plot and was significantly higher than all other weed control treatments. Physiological parameters of the crop viz., leaf area index, leaf area duration, chlorophyll content index, and PS Ⅱ quantum were reported maximum under weed-free plot followed by pyrithiobac sodium + quizalofop ethyl 100 (60 + 40) g/haas PoE at 25 DAS + IC fb HW at 50 DAS. The seed cotton yield was reported significantly higher under weed free plot over all other weed control treatments except T 8 which was adjudged at par with weed- free plot. Based on the results of the experiment, it is concluded that T 8 controlled weeds effectively in Bt cotton and gave higher seed cotton yield and net return under North Gujarat conditions.
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Claims 8
Claim · model-written summary
Different weed control treatments significantly affected the dry weight of total weeds across the crop growth stages in Bt cotton.
- Taxon
- Bt cottone1
- Material
- GTHH 49e1
- Treatment
- weed control treatmentse2
- Interactor
- total weedse2weed
- Outcome
- dry weight of total weedse2
- Setting
- Agronomy Instructional Farme0
Not reportedComparatorDirection
Verbatim
e0“a field experiment was planned and conducted at Agronomy Instructional Farm, Chimanbhai Patel College of Agriculture”
e1“The Bt cotton variety GTHH 49 was sown manually”
e2“Different weed control treatments significantly affected the dry weight of total weeds across the crop growth stages”
Claim · model-written summary
Pyrithiobac sodium plus quizalofop ethyl PoE at 25 DAS with IC fb HW at 50 DAS (T8) gave the minimum total weed dry weight at 75 DAS, significantly lower than all other treatments except the weed-free plot.
- Taxon
- Bt cottone1
- Material
- GTHH 49e1
- Treatment
- pyrithiobac sodium + quizalofop ethyl 100 (60 + 40) g/ha as PoE at 25 DAS + IC fb HW at 50 DASe4
- Interactor
- total weedse4weed
- Outcome
- dry weight of total weeds at 75 DASe4
- Direction
- minimume4
- Comparator
- all other treatments except weed free plote5
- Setting
- Agronomy Instructional Farme0
Verbatim
e0“a field experiment was planned and conducted at Agronomy Instructional Farm, Chimanbhai Patel College of Agriculture”
e1“The Bt cotton variety GTHH 49 was sown manually”
e4“the dry weight of total weeds at 75 DAS was found minimum under pyrithiobac sodium + quizalofop ethyl 100 (60 + 40) g/ha as PoE at 25 DAS + IC fb HW at 50 DAS (T 8 )”
e5“which had significantly reduced the dry weight of total weeds compared to all other treatments except weed free plot”
Claim · model-written summary
The weedy check plot had the maximum total weed dry weight at 25, 50 and 75 DAS, significantly higher than all other weed control treatments.
Verbatim
e0“a field experiment was planned and conducted at Agronomy Instructional Farm, Chimanbhai Patel College of Agriculture”
e1“The Bt cotton variety GTHH 49 was sown manually”
e6“The maximum dry weight of total weeds at 25, 50, and 75 DAS was observed under a weedy check plot and was significantly higher than all other weed control treatments”
Claim · model-written summary
The weed-free plot gave the maximum leaf area index, leaf area duration and chlorophyll content index of the crop.
- Taxon
- Bt cottone1
- Material
- GTHH 49e1
- Treatment
- weed-free plote7
- Outcome
- leaf area index, leaf area duration, chlorophyll content indexe7
- Direction
- maximume7
- Setting
- Agronomy Instructional Farme0
Not reportedComparator
Verbatim
e0“a field experiment was planned and conducted at Agronomy Instructional Farm, Chimanbhai Patel College of Agriculture”
e1“The Bt cotton variety GTHH 49 was sown manually”
e7“Physiological parameters of the crop viz., leaf area index, leaf area duration, chlorophyll content index, and PS Ⅱ quantum were reported maximum under weed-free plot”
Claim · model-written summary
The weed-free plot gave the maximum PS II quantum of the crop.
- Taxon
- Bt cottone1
- Material
- GTHH 49e1
- Treatment
- weed-free plote7
- Outcome
- PS Ⅱ quantume7
- Direction
- maximume7
- Setting
- Agronomy Instructional Farme0
Not reportedComparator
Verbatim
e0“a field experiment was planned and conducted at Agronomy Instructional Farm, Chimanbhai Patel College of Agriculture”
e1“The Bt cotton variety GTHH 49 was sown manually”
e7“Physiological parameters of the crop viz., leaf area index, leaf area duration, chlorophyll content index, and PS Ⅱ quantum were reported maximum under weed-free plot”
Claim · model-written summary
The seed cotton yield under the weed-free plot was significantly higher than under all other weed control treatments except T8.
Verbatim
e0“a field experiment was planned and conducted at Agronomy Instructional Farm, Chimanbhai Patel College of Agriculture”
e1“The Bt cotton variety GTHH 49 was sown manually”
e2“The seed cotton yield was reported significantly higher under weed free plot over all other weed control treatments except T 8 which was adjudged at par with weed- free plot”
Claim · model-written summary
T8 gave seed cotton yield at par with the weed-free plot.
Verbatim
e1“The Bt cotton variety GTHH 49 was sown manually”
e4“the dry weight of total weeds at 75 DAS was found minimum under pyrithiobac sodium + quizalofop ethyl 100 (60 + 40) g/ha as PoE at 25 DAS + IC fb HW at 50 DAS (T 8 )”
e5“The seed cotton yield was reported significantly higher under weed free plot over all other weed control treatments except T 8 which was adjudged at par with weed- free plot”
e6“which was adjudged at par with weed- free plot”
Claim · model-written summary
T8 controlled weeds effectively in Bt cotton and gave higher seed cotton yield and net return under North Gujarat conditions.
Not reportedComparator
Verbatim
e2“T 8 controlled weeds effectively in Bt cotton and gave higher seed cotton yield and net return under North Gujarat conditions”
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