Abstract
The effects of competition of six weed species on growth, nutrient concentration and nutrient content of coffee plant root system under greenhouse conditions were evaluated. Thirty days after coffee seedling transplantation into 12 L pots with soil level area of 6.5 dm². Weeds were transplanted or sowed in these pots, at densities of 0, 1, 2, 3, 4 and 5 plants per pot. The duration of competition (or weedy periods) from weed transplantation or emergence until plant harvesting, at the weed preflowering stage, were (in days): 77 (Bidens pilosa), 180 (Commelina diffusa), 82 (Leonurus sibiricus), 68 (Nicandra physaloides), 148 (Richardia brasiliensis) and 133 (Sida rhombifolia). Dry matter of coffee plants was linearly reduced with increasing B. pilosa and S. rhombifolia density, with pronounced effect of B. pilosa. C. diffusa was the only weed species whose increasing density in the pots did not diminish crop root dry matter. L. sibiricus, N. physaloides and R. brasiliensis reduced root dry matter of coffee plants by 75, 52 and 47%, respectively, as compared to the weed-free treatment, regardless of weed density. Under competition, even though weed species showed lower macronutrient concentration in the roots (except for P), they accumulated 4.2 (N), 12.3 (P), 4.3 (K), 5.5 (Ca), 7.6 (Mg) and 4.4 (S) times more nutrients in the roots than the coffee plants. Crop and weed nutrient concentration, as well as competition degrees greatly varied depending on both weed species and densities.
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Claims 14
Claim · model-written summary
Coffee dry matter declined linearly with increasing B. pilosa density.
- Treatment
- increasing B. pilosae0
- Interactor
- B. pilosa
Bidens pilosae0weed - Outcome
- Dry matter of coffee plantse0
- Direction
- reducede0
CoffeaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry matter of coffee plants was linearly reduced with increasing B. pilosa and S. rhombifolia density, with pronounced effect of B. pilosa.”
Claim · model-written summary
Coffee dry matter declined linearly with increasing S. rhombifolia density.
- Treatment
- S. rhombifolia densitye0
- Interactor
- S. rhombifolia
.jpg?width=60)
Sida rhombifoliae0weed - Outcome
- Dry matter of coffee plantse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Dry matter of coffee plants was linearly reduced with increasing B. pilosa and S. rhombifolia density, with pronounced effect of B. pilosa.”
Claim · model-written summary
Increasing C. diffusa density did not diminish coffee root dry matter.
- Treatment
- increasing densitye0
- Interactor
- C. diffusa
Commelina diffusae0weed - Outcome
- crop root dry mattere0
- Direction
- did not diminishe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“C. diffusa was the only weed species whose increasing density in the pots did not diminish crop root dry matter.”
t0“coffee”
Claim · model-written summary
L. sibiricus reduced coffee root dry matter 75% versus weed-free treatment.
- Treatment
- L. sibiricuse0
- Interactor
- L. sibiricus
Paraleonurus sibiricuse0weed - Outcome
- root dry matter of coffee plantse0
- Direction
- reducede0
- Value
- 75e0
- Comparator
- weed-free treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L. sibiricus, N. physaloides and R. brasiliensis reduced root dry matter of coffee plants by 75, 52 and 47%, respectively, as compared to the weed-free treatment, regardless of weed density.”
Claim · model-written summary
N. physaloides reduced coffee root dry matter 52%.
- Treatment
- N. physaloidese0
- Interactor
- N. physaloides
Nicandra physalodese0weed - Outcome
- root dry matter of coffee plantse0
- Direction
- reducede0
- Value
- 52e0
- Comparator
- weed-free treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L. sibiricus, N. physaloides and R. brasiliensis reduced root dry matter of coffee plants by 75, 52 and 47%, respectively, as compared to the weed-free treatment, regardless of weed density.”
Claim · model-written summary
R. brasiliensis reduced coffee root dry matter 47%.
- Treatment
- R. brasiliensise0
- Interactor
- R. brasiliensis
Richardia brasiliensise0weed - Outcome
- root dry matter of coffee plantse0
- Direction
- reducede0
- Value
- 47%e0
- Comparator
- weed-free treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L. sibiricus, N. physaloides and R. brasiliensis reduced root dry matter of coffee plants by 75, 52 and 47%, respectively, as compared to the weed-free treatment, regardless of weed density.”
Claim · model-written summary
Competing weeds had lower root macronutrient concentrations except P than coffee.
- Organ / stage
- rootse0
- Outcome
- weed species showed lower macronutrient concentration in the rootse0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“weed species showed lower macronutrient concentration in the roots (except for P)”
t0“coffee”
Claim · model-written summary
Competing weeds accumulated 4.2 times more root N than coffee.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they accumulated 4.2 (N), 12.3 (P), 4.3 (K), 5.5 (Ca), 7.6 (Mg) and 4.4 (S) times more nutrients in the roots than the coffee plants.”
Claim · model-written summary
Competing weeds accumulated 12.3 times more root P than coffee.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they accumulated 4.2 (N), 12.3 (P), 4.3 (K), 5.5 (Ca), 7.6 (Mg) and 4.4 (S) times more nutrients in the roots than the coffee plants.”
Claim · model-written summary
Competing weeds accumulated 4.3 times more root K than coffee.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they accumulated 4.2 (N), 12.3 (P), 4.3 (K), 5.5 (Ca), 7.6 (Mg) and 4.4 (S) times more nutrients in the roots than the coffee plants.”
Claim · model-written summary
Competing weeds accumulated 5.5 times more root Ca than coffee.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they accumulated 4.2 (N), 12.3 (P), 4.3 (K), 5.5 (Ca), 7.6 (Mg) and 4.4 (S) times more nutrients in the roots than the coffee plants.”
Claim · model-written summary
Competing weeds accumulated 7.6 times more root Mg than coffee.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they accumulated 4.2 (N), 12.3 (P), 4.3 (K), 5.5 (Ca), 7.6 (Mg) and 4.4 (S) times more nutrients in the roots than the coffee plants.”
Claim · model-written summary
Competing weeds accumulated 4.4 times more root S than coffee.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they accumulated 4.2 (N), 12.3 (P), 4.3 (K), 5.5 (Ca), 7.6 (Mg) and 4.4 (S) times more nutrients in the roots than the coffee plants.”
Claim · model-written summary
Crop and weed nutrient concentrations and competition varied by weed species and density.
- Treatment
- weed species and densitiese0
- Outcome
- Crop and weed nutrient concentration, as well as competition degreese0
- Direction
- variede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop and weed nutrient concentration, as well as competition degrees greatly varied depending on both weed species and densities.”
t0“coffee”
The same questions in other papers
Bidens pilosa · growth · Coffea (coffee)Results agree
1 paper in the same direction as this paper
- negative
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.