Abstract
In production agriculture, weed plants play an important role in yield reduction. Analysis of crop growth can reveal underlying processes of yield loss under weed interference conditions. Therefore, an experiment was conducted in 2011 in order to assess the effect of weed competition on different aspects of dry bean growth. The experiment was a randomized complete block design with 3 replications. Treatments included weed-infested and weed-free periods until 0, 10, 20, 30, 40 and 50 days after crop emergence. Aboveground dry matter and leaf area were measured every two weeks. The functional approach to growth analysis was used to examine temporal patterns in crop growth in weed interference conditions. A negative relationship between weed biomass and dry bean growth indexes was observed. In all treatments, crop biomass had a similar trend and progressively increased over the crop cycle, then after reaching the maximum amount, gradually decreased. The lowest crop biomass (676.60 g m-2) was observed in season-long weed-infested treatment, while the maximum one (1238.82 g m-2) was recorded in season-long weed-free treatment. Relative growth rate (RGR) and net assimilation rate (NAR) had a declining trend during the growing season. Increase in weed-infested periods intensified decrease of them. Effect of weed competition on crop growth was trifle at the early of growing season. Since NAR and RGR represent photosynthesis potential and dry matter accumulation of the crop, their reduction can be the main cause of yield loss.
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Claims 8
Claim · model-written summary
Weed biomass was negatively associated with dry bean growth indexes.
Not reportedDirection
Verbatim
e0“A negative relationship between weed biomass and dry bean growth indexes was observed”
Claim · model-written summary
Crop biomass increased over the crop cycle and then declined after its maximum.
Verbatim
e0“In all treatments, crop biomass had a similar trend and progressively increased over the crop cycle, then after reaching the maximum amount, gradually decreased”
t0“Dry Bean (Phaseolus vulgaris L.)”
Claim · model-written summary
Season-long weed infestation yielded the lowest crop biomass, 676.60 g m-2.
- Taxon
- Dry Beant0
- Treatment
- season-long weed-infested treatmente0
- Interactor
- weede0weed
- Outcome
- crop biomasse0
- Direction
- loweste0
- Value
- 676.60 g m-2e0
Not reportedComparator
Verbatim
e0“The lowest crop biomass (676.60 g m-2) was observed in season-long weed-infested treatment”
t0“Dry Bean (Phaseolus vulgaris L.)”
Claim · model-written summary
Season-long weed freedom yielded the maximum crop biomass, 1238.82 g m-2.
- Taxon
- Dry Beant0
- Treatment
- season-long weed-free treatmente0
- Outcome
- crop biomasse1
- Direction
- maximume0
- Value
- 1238.82 g m-2e0
Not reportedComparator
Verbatim
e0“the maximum one (1238.82 g m-2) was recorded in season-long weed-free treatment”
t0“Dry Bean (Phaseolus vulgaris L.)”
e1“The lowest crop biomass (676.60 g m-2) was observed in season-long weed-infested treatment”
Claim · model-written summary
Relative growth rate and net assimilation rate declined during the growing season.
Verbatim
e0“Relative growth rate (RGR) and net assimilation rate (NAR) had a declining trend during the growing season”
t0“Dry Bean (Phaseolus vulgaris L.)”
Claim · model-written summary
Longer weed-infested periods intensified decreases in RGR and NAR.
- Taxon
- Dry Beant0
- Treatment
- weed-infested periodse0
- Interactor
- weede0weed
- Outcome
- Relative growth rate (RGR) and net assimilation rate (NAR)e1
- Direction
- decreasee0
Not reportedComparator
Verbatim
e0“Increase in weed-infested periods intensified decrease of them”
t0“Dry Bean (Phaseolus vulgaris L.)”
e1“Relative growth rate (RGR) and net assimilation rate (NAR) had a declining trend during the growing season”
Claim · model-written summary
Weed competition had little effect on crop growth early in the season.
Verbatim
e0“Effect of weed competition on crop growth was trifle at the early of growing season”
t0“Dry Bean (Phaseolus vulgaris L.)”
Claim · model-written summary
The authors propose that reduced NAR and RGR can be a main cause of yield loss.
Verbatim
e0“their reduction can be the main cause of yield loss”
e1“Since NAR and RGR represent photosynthesis potential and dry matter accumulation of the crop”
t0“Dry Bean (Phaseolus vulgaris L.)”
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