Abstract
A field experiment was conducted during two consecutive seasons of rabi 2004- 05 and 2005-06 at S. V. Agricultural College Farm, Tirupati in the southern agro-climatic zone of Andhra Pradesh to study the effect of different planting patterns (75 x 16 cm, 60 x 20 cm, 75 x 20 cm and 60 x 25 cm) and weed control practices [weedy check, hand weeding (HW) twice at 15 and 30 days after sowing (DAS), pre-emergence application of atrazine @1 kg/ha+HW at 30 DAS, pre-emergence application of atrazine @ 1 kg/ha+postemergence application of paraquat @ 0.5 kg/ha at 30 DAS] on the weed growth and performance of sweet corn. Results revealed that planting pattern of 60 x 20 cm recorded the lowest density, dry weight and nutrient uptake of weeds with the highest leaf area index, dry matter production and nutrient uptake of sweet corn. It was, however, on par with 75 x 16 cm. Though the yield attributes viz., cob length, green cob weight (with husk) and number of kernels/cob were significantly higher with 60 x 25 cm, the narrow row spacing and higher number of 83,333 plants/ha with 60 x 20 cm resulted in the highest yield of green cob (13.9 and 13.1 t/ha) and green fodder (17.6 and 16.7 t/ha) with enhanced monetary returns (benefit : cost ratio of 3.43 and 3.23) during 2004 and 2005, respectively. All the three weed control practices were more or less equally effective in suppressing the weed growth and were superior to weedy check. Integrated weed management practice of pre-emergence application of atrazine @ 1 kg/ha+HW at 30 DAS recorded distinctly lower weed count, dry weight and nutrient uptake of weeds, improved the crop growth stature, yield attributes, in turn resulted in the highest green cob (14.2 and 13.4 t/ha) and fodder yield (18.0 and 17.1 t/ha) of sweet corn, which were found to be at par with pre-emergence application of atrazine @ 1 kg/ha+post-emergence application of paraquat @ 0.5 kg/ha and HW twice at 15 and 30 DAS. Weeds in the best treatment as pre-emergence of atrazine+HW at 30 DAS recorded 42.3, 54.0 and 46.2% lesser uptake of nitrogen, phosphorus and potassium, respectively, over weedy check during 2004-05, whereas it was lesser to the extent of 47.4, 65.4 and 44.2% during 2005-06.
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Claims 14
Claim · model-written summary
The 60 x 20 cm pattern had the lowest weed density, dry weight and nutrient uptake.
- Taxon
- sweet cornt0
- Treatment
- 60 x 20 cme0
- Outcome
- density, dry weight and nutrient uptake of weedse0
- Direction
- loweste0
Not reportedComparator
Verbatim
e0“planting pattern of 60 x 20 cm recorded the lowest density, dry weight and nutrient uptake of weeds”
t0“sweet corn”
Claim · model-written summary
The 60 x 20 cm pattern had the highest sweet corn leaf area index, dry matter production and nutrient uptake.
- Taxon
- sweet corne0
- Treatment
- 60 x 20 cme2
- Outcome
- leaf area index, dry matter production and nutrient uptakee0
- Direction
- higheste0
Not reportedComparator
Verbatim
e0“with the highest leaf area index, dry matter production and nutrient uptake of sweet corn.”
e2“planting pattern of 60 x 20 cm”
Claim · model-written summary
The 60 x 25 cm pattern significantly increased cob length, green cob weight and kernels per cob.
- Taxon
- sweet cornt0
- Treatment
- 60 x 25 cme0
- Outcome
- cob length, green cob weight (with husk) and number of kernels/cobe0
- Direction
- highere0
Not reportedComparator
Verbatim
e0“cob length, green cob weight (with husk) and number of kernels/cob were significantly higher with 60 x 25 cm”
t0“sweet corn”
Claim · model-written summary
The 60 x 20 cm pattern gave the highest green cob yield in 2004 and 2005.
- Taxon
- sweet cornt0
- Treatment
- 60 x 20 cme0
- Outcome
- yield of green cobe0
- Direction
- higheste0
- Value
- 13.9 and 13.1 t/hae0
Not reportedComparator
Verbatim
e0“60 x 20 cm resulted in the highest yield of green cob (13.9 and 13.1 t/ha)”
t0“sweet corn”
Claim · model-written summary
The 60 x 20 cm pattern gave the highest green fodder yield in 2004 and 2005.
- Taxon
- sweet corne3
- Treatment
- 60 x 20 cme2
- Outcome
- green foddere0
- Direction
- higherinferrede0
- Value
- 17.6 and 16.7 t/hae0
Not reportedComparator
Verbatim
e0“green fodder (17.6 and 16.7 t/ha)”
e2“planting pattern of 60 x 20 cm”
e3“performance of sweet corn”
Claim · model-written summary
The 60 x 20 cm pattern enhanced monetary returns.
- Taxon
- sweet corne3
- Treatment
- 60 x 20 cme2
- Outcome
- monetary returnse0
- Direction
- enhancede0
- Value
- 3.43 and 3.23e0
Not reportedComparator
Verbatim
e0“enhanced monetary returns (benefit : cost ratio of 3.43 and 3.23)”
e2“planting pattern of 60 x 20 cm”
e3“performance of sweet corn”
Claim · model-written summary
All three weed control practices suppressed weeds relative to the weedy check.
Verbatim
e0“All the three weed control practices were more or less equally effective in suppressing the weed growth and were superior to weedy check.”
t0“sweet corn”
Claim · model-written summary
Atrazine plus hand weeding produced lower weed count, dry weight and nutrient uptake.
- Taxon
- sweet cornt0
- Treatment
- pre-emergence application of atrazine @ 1 kg/ha+HW at 30 DASe0
- Outcome
- weed count, dry weight and nutrient uptake of weedse0
- Direction
- lowere0
Not reportedComparator
Verbatim
e0“pre-emergence application of atrazine @ 1 kg/ha+HW at 30 DAS recorded distinctly lower weed count, dry weight and nutrient uptake of weeds”
t0“sweet corn”
Claim · model-written summary
Atrazine plus hand weeding improved crop growth stature and yield attributes.
- Taxon
- sweet corne3
- Treatment
- atrazine @ 1 kg/ha+HW at 30 DASe2
- Outcome
- crop growth stature, yield attributese0
- Direction
- improvede0
Not reportedComparator
Verbatim
e0“improved the crop growth stature, yield attributes”
e2“pre-emergence application of atrazine @ 1 kg/ha+HW at 30 DAS”
e3“performance of sweet corn”
Claim · model-written summary
Atrazine plus hand weeding gave the highest green cob yield.
- Taxon
- sweet corne3
- Treatment
- atrazine @ 1 kg/ha+HW at 30 DASe2
- Outcome
- green cobe0
- Direction
- higheste0
- Value
- 14.2 and 13.4 t/hae0
Not reportedComparator
Verbatim
e0“highest green cob (14.2 and 13.4 t/ha)”
e2“pre-emergence application of atrazine @ 1 kg/ha+HW at 30 DAS”
e3“performance of sweet corn”
Claim · model-written summary
Atrazine plus hand weeding gave the highest fodder yield.
- Taxon
- sweet corne3
- Treatment
- atrazine @ 1 kg/ha+HW at 30 DASe2
- Outcome
- fodder yielde0
- Direction
- higherinferrede0
- Value
- 18.0 and 17.1 t/hae0
Not reportedComparator
Verbatim
e0“fodder yield (18.0 and 17.1 t/ha)”
e2“pre-emergence application of atrazine @ 1 kg/ha+HW at 30 DAS”
e3“performance of sweet corn”
Claim · model-written summary
Weed nitrogen uptake was 42.3% lower in 2004-05 and 47.4% lower in 2005-06 with atrazine plus hand weeding.
Verbatim
e0“42.3, 54.0 and 46.2% lesser uptake of nitrogen, phosphorus and potassium, respectively, over weedy check during 2004-05, whereas it was lesser to the extent of 47.4, 65.4 and 44.2% during 2005-06.”
t0“sweet corn”
e1“Weeds in the best treatment as pre-emergence of atrazine+HW at 30 DAS recorded”
Claim · model-written summary
Weed phosphorus uptake was reduced by 54.0% and 65.4% in the two seasons.
Verbatim
e0“42.3, 54.0 and 46.2% lesser uptake of nitrogen, phosphorus and potassium, respectively, over weedy check during 2004-05, whereas it was lesser to the extent of 47.4, 65.4 and 44.2% during 2005-06.”
t0“sweet corn”
e1“Weeds in the best treatment as pre-emergence of atrazine+HW at 30 DAS recorded”
Claim · model-written summary
Weed potassium uptake was reduced by 46.2% and 44.2% in the two seasons.
Verbatim
e0“42.3, 54.0 and 46.2% lesser uptake of nitrogen, phosphorus and potassium, respectively, over weedy check during 2004-05, whereas it was lesser to the extent of 47.4, 65.4 and 44.2% during 2005-06.”
t0“sweet corn”
e1“Weeds in the best treatment as pre-emergence of atrazine+HW at 30 DAS recorded”
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