Abstract
Abstract Willow ( Salix sp.) sawdust (WS) is used as a component of growing media in horticultural crops and potted plant production in Santa Fe, Argentina. We evaluated the use of the germination bioassay as an indicator of WS maturity/phytotox‐icity by comparing bioassays results with dry matter production of plants growing in the same substrate. Lettuce ( Lactuca sativa L.) seeds were sown on filter paper moistened with extracts of WS composted for different times. Germinated seeds were counted (G) and the radicle growth (L) measured. Germination index (Gi) = G/G 0 × L/L 0 × 100, where G 0 and L 0 are values obtained using distilled water (control). The global germination index (GI) was the Gi average of the 50 and 75% extract dilution. GI of lettuce increased from 5% in the non‐composted WS to 93.3% in the WS composted for 40 days. GI did not change significantly after 40 days of composting. Calendula dry matter production increased from 8 g/plant in non‐composted WS to 17.1 g/plant in WS composted for 40 or 60 days. The addition of nitrogen and pH corrector did not affect GI of the WS growth media but they both increased calendula dry matter production to 21.1–22.7 g/plant when WS composted for 40 or 60 days was used as a growth medium.
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Claims 7
Claim · model-written summary
Lettuce germination index rose from 5% in un-composted willow sawdust to 93.3% after 40 days.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- WS composted for 40 dayse0
- Outcome
- GI of lettucee0
- Direction
- increasede0
- Value
- 93.3%e0
- Qualifier
- 5%e0
- Comparator
- non‐composted WSe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GI of lettuce increased from 5% in the non‐composted WS to 93.3% in the WS composted for 40 days”
Claim · model-written summary
Lettuce germination index showed no significant further change after 40 days of composting.
- Taxon
- lettuceLactuca sativae1
- Outcome
- GIe0
- Direction
- did not changee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GI did not change significantly after 40 days of composting”
e1“GI of lettuce increased”
Claim · model-written summary
Calendula dry matter rose from 8 to 17.1 g per plant in willow sawdust composted 40 or 60 days.
- Treatment
- WS composted for 40 or 60 dayse0
- Outcome
- dry matter productione0
- Direction
- increasede0
- Value
- 17.1 g/plante0
- Qualifier
- 8 g/plante0
- Comparator
- non‐composted WSe0
CalendulaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Calendula dry matter production increased from 8 g/plant in non‐composted WS to 17.1 g/plant in WS composted for 40 or 60 days”
Claim · model-written summary
Nitrogen addition did not affect germination index.
- Taxon
- lettuceLactuca sativae1
- Treatment
- nitrogene0
- Outcome
- GIe0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The addition of nitrogen and pH corrector did not affect GI of the WS growth media”
e1“GI of lettuce increased”
Claim · model-written summary
pH corrector addition did not affect germination index.
- Taxon
- lettuceLactuca sativae1
- Treatment
- pH correctore0
- Outcome
- GIe0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The addition of nitrogen and pH corrector did not affect GI of the WS growth media”
e1“GI of lettuce increased”
Claim · model-written summary
Nitrogen addition increased calendula dry matter to 21.1–22.7 g per plant in mature compost.
- Treatment
- nitrogene1
- Outcome
- calendula dry matter productione0
- Direction
- increasede0
- Value
- 21.1–22.7 g/plante0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they both increased calendula dry matter production to 21.1–22.7 g/plant when WS composted for 40 or 60 days was used as a growth medium”
e1“The addition of nitrogen and pH corrector”
t0“willow ( Salix sp.) sawdust”
Claim · model-written summary
pH correction increased calendula dry matter to 21.1–22.7 g per plant in mature compost.
- Treatment
- pH correctore1
- Outcome
- calendula dry matter productione0
- Direction
- increasede0
- Value
- 21.1–22.7 g/plante0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they both increased calendula dry matter production to 21.1–22.7 g/plant when WS composted for 40 or 60 days was used as a growth medium”
e1“The addition of nitrogen and pH corrector”
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