Abstract
A field experiment was conducted during 1998-2002 to study the effect of preceding crops and tillage systems on population dynamics of weeds in sugarcane crop and its yield and quality in relation to weed management. The sugarcane crop faced intense competition with sedges (abundance index >4) at tillering stage (60 days after planting) irrespective of preceding crops, viz wheat (Triticum aestivum L. emend. Fiori & Paol.) or Indian mustard [Brassica juncea (L.) Czernj. & Cosson], and tillage systems, viz conventional or minimum. At the onset of grand growth (120 days after planting), the weed flora was influenced with the extent of rainfall, as grasses took over the field (abundance index > 4) from sedges in the second crop cycle that received good rainfall. Indian mustard as preceding crop caused significantly higher weed density in sugarcane (60.1 and 67.5/m² in 1999-2000 and 2000-01) compared with that after wheat (47.4 and 58.1/m²) at 60 days after planting. Effect of tillage systems on weed density and dry matter production in sugarcane crop was, however, inconsistent over the crop stages and seasons. Significantly higher cane yield owing to management of weeds through hoeing (64.1 and 84.7 tonnes/ha) as well as herbicides (58 and 70.4 tonnes/ha) was obtained over weedy check (49.9 and 33.9 tonnes/ha) that caused 22.1 and 59.9% loss in cane yield during the first and second crop cycles respectively.
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Claims 8
Claim · model-written summary
Sedges strongly competed with sugarcane at tillering regardless of preceding crop or tillage.
- Taxon
- sugarcanee0
- Organ / stage
- tillering stagee0
- Outcome
- intense competition with sedgese0
- Value
- 60 dayse0
CarexOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sugarcane crop faced intense competition with sedges (abundance index >4) at tillering stage (60 days after planting) irrespective of preceding crops”
Claim · model-written summary
With good rainfall in the second crop cycle, grasses replaced sedges as dominant weeds in sugarcane.
- Taxon
- sugarcanet0
- Interactor
- grassese0weed
- Outcome
- grasses took over the fielde0
- Qualifier
- second crop cycle that received good rainfalle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grasses took over the field (abundance index > 4) from sedges in the second crop cycle that received good rainfall”
t0“sugarcane”
Claim · model-written summary
Indian mustard as preceding crop raised sugarcane weed density relative to wheat at 60 days.
Verbatim
e0“Indian mustard as preceding crop caused significantly higher weed density in sugarcane (60.1 and 67.5/m² in 1999-2000 and 2000-01) compared with that after wheat (47.4 and 58.1/m²) at 60 days after planting”
Claim · model-written summary
Tillage effects on weed density in sugarcane were inconsistent across stages and seasons.
Not reportedComparator
Verbatim
e0“Effect of tillage systems on weed density and dry matter production in sugarcane crop was, however, inconsistent over the crop stages and seasons”
Claim · model-written summary
Tillage effects on weed dry matter production in sugarcane were inconsistent across stages and seasons.
Not reportedComparator
Verbatim
e0“Effect of tillage systems on weed density and dry matter production in sugarcane crop was, however, inconsistent over the crop stages and seasons”
Claim · model-written summary
Hoeing significantly raised cane yield over the weedy check in both crop cycles.
Verbatim
e0“Significantly higher cane yield owing to management of weeds through hoeing (64.1 and 84.7 tonnes/ha) as well as herbicides (58 and 70.4 tonnes/ha) was obtained over weedy check (49.9 and 33.9 tonnes/ha)”
t0“sugarcane”
Claim · model-written summary
Herbicides significantly raised cane yield over the weedy check in both crop cycles.
Verbatim
e0“Significantly higher cane yield owing to management of weeds through hoeing (64.1 and 84.7 tonnes/ha) as well as herbicides (58 and 70.4 tonnes/ha) was obtained over weedy check (49.9 and 33.9 tonnes/ha)”
t0“sugarcane”
Claim · model-written summary
Weeds caused sugarcane yield losses of 22.1 and 59.9% in the first and second crop cycles.
Verbatim
e0“weedy check (49.9 and 33.9 tonnes/ha) that caused 22.1 and 59.9% loss in cane yield during the first and second crop cycles respectively”
t0“sugarcane”
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.