Abstract
The use of residues from coffee production to obtain biochar is a sustainable approach, which aims to minimize the environmental impact of these materials. In this study, the effect of adding coffee straw biochar on the physiological quality of lettuce and sorghum seeds was investigated. Thus, the objective of this work was to study the effect of adding different concentrations of coffee biochar in the substrate composition on the physiological quality of lettuce (Lactuca sativa) and sorghum (Sorghum bicolor) seeds. The experimental design used was completely randomized, with five concentrations of biochar (0; 7.5; 15; 30 and 60%), conducted with four replications of 25 seeds. The use of biochar in the concentrations studied does not provide an increase in the average germination percentage and vigor of lettuce and sorghum seeds. The increase in the concentration of biochar caused less seed vigor, suggesting a toxic effect. For seed germination, there was no significant difference between lettuce and sorghum species, regardless of treatment. For the germination speed index, sorghum seeds have higher means, except for the treatment with the addition of 15% coffee straw biochar. Lettuce seeds have higher shoot length averages, except for treatment with 100% commercial substrate. The sorghum seeds have higher mean root length and dry mass than lettuce, regardless of the treatment.
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Claims 7
Claim · model-written summary
Biochar did not increase lettuce seed germination percentage or vigor.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- biochar in the concentrations studiede0
- Outcome
- average germination percentage and vigore0
- Direction
- does not provide an increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of biochar in the concentrations studied does not provide an increase in the average germination percentage and vigor of lettuce and sorghum seeds”
Claim · model-written summary
Biochar did not increase sorghum seed germination percentage or vigor.
- Treatment
- biochar in the concentrations studiede0
- Outcome
- average germination percentage and vigore0
- Direction
- does not provide an increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of biochar in the concentrations studied does not provide an increase in the average germination percentage and vigor of lettuce and sorghum seeds”
Claim · model-written summary
Increasing biochar concentration reduced seed vigor.
- Taxon
- lettuceLactuca sativat0
- Treatment
- concentration of biochare0
- Outcome
- seed vigore0
- Direction
- lesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase in the concentration of biochar caused less seed vigor”
t0“lettuce and sorghum”
Claim · model-written summary
Germination did not differ significantly between lettuce and sorghum.
- Taxon
- lettuce and sorghumLactuca sativa
Sorghume0 - Outcome
- seed germinatione0
- Direction
- no significant differencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For seed germination, there was no significant difference between lettuce and sorghum species, regardless of treatment”
Claim · model-written summary
Sorghum had higher germination speed index except with 15% biochar.
- Outcome
- germination speed indexe0
- Direction
- highere0
- Qualifier
- except for the treatment with the addition of 15% coffee straw biochare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the germination speed index, sorghum seeds have higher means, except for the treatment with the addition of 15% coffee straw biochar”
Claim · model-written summary
Lettuce had higher shoot length except with commercial substrate.
- Taxon
- LettuceLactuca sativae0
- Outcome
- shoot lengthe0
- Direction
- highere0
- Qualifier
- except for treatment with 100% commercial substratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce seeds have higher shoot length averages, except for treatment with 100% commercial substrate”
Claim · model-written summary
Sorghum had greater root length and dry mass than lettuce.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sorghum seeds have higher mean root length and dry mass than lettuce, regardless of the treatment”
The same questions in other papers
biochar · growth · SorghumResults differ
3 papers in the same direction as this paper · 11 in the opposite direction
- positive
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See all 15 papers →biochar · growth · Lactuca sativa (garden lettuce)Results differ
10 papers in the same direction as this paper · 41 in the opposite direction
- negative
- positive
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See all 52 papers →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.