Abstract
Ten substrates were formulated by blending perlite or parboiled fresh rice hulls (PFH) at 20%, 30%, 40%, 50%, or 60% (v/v) with sphagnum peat. After 6 weeks, NH 4 + concentrations were not significantly different among substrates containing perlite and those containing equivalent amounts of PFH. Nitrate concentrations were significantly higher in the 40% perlite substrate than in the 40% PFH substrate, but there were no significant differences in NO 3 - concentrations among the remaining substrates containing equivalent amounts of PFH or perlite. When tomato ( Lycopersicon esculentum Mill . ) was grown in the substrates for 5 weeks, tissue N concentrations were not significantly different between equivalent perlite and PFH-containing substrates. Non-parboiled fresh rice hulls produced organically contained a higher number of viable weed seeds than non-parboiled fresh rice hulls produced conventionally. No weed seeds germinated in the PFH. `Better Boy' tomato, `Bonanza Yellow' marigold ( Tagetes patula L. French M.), `Orbit Cardinal' geranium ( Pelargonium × hortorum L.H. Bailey), `Cooler Blush' vinca ( Catharanthus roseus L.G. Don), `Dazzler Rose Star' impatiens ( Impatiens walleriana Hook. f.), and `Bingo Azure' pansy ( Viola × wittrockiana Gams) were grown in sphagnum peat-based substrates containing perlite or PFH at 10%, 15%, 20%, 25%, 30%, 35%, or 40% (v/v). Dry root weights of vinca and geranium were not significantly different among plants grown in the substrates. Tomato plants grown in 10%, 15%, 25%, 30%, and 35% PFH had significantly higher dry root weights than those grown in equivalent perlite-containing substrates. Impatiens grown in 35% PFH had higher dry root weights than those grown in 35% perlite. Marigold grown in 20% perlite had higher dry root weights than those grown in 20% PFH. However, there were no significant differences in impatiens or marigold dry root weights among the remaining substrates containing equivalent amounts of PFH or perlite. Dry root weights of pansy grown in 10%, 20% 25%, 35%, and 40% perlite were not significantly different from those grown in equivalent PFH-containing substrates. Across substrates, root dry weights of impatiens, marigold, and pansy grown in perlite-containing substrates were not significantly different from those grown in PFH-containing substrates. No significant difference in dry shoot weights of vinca, geranium, impatiens, and marigold occurred between equivalent perlite and PFH-containing substrates. Tomato plants grown in 20% to 40% perlite had significantly higher dry shoot weights than those grown in equivalent PFH-containing substrates. However, dry shoot weights of tomato grown in 10% to 15% perlite were not significantly different from those grown in equivalent PFH-containing substrates. Dry shoot weights of pansy grown in 10%, 25%, 30%, 35%, and 40% perlite were not significantly different from those grown in equivalent PFH substrates.
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Claims 17
Claim · model-written summary
Tomato tissue nitrogen did not differ significantly between equivalent perlite and rice-hull substrates.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- PFH-containing substratese0
- Outcome
- tissue N concentrationse0
- Direction
- not significantly differente0
- Comparator
- perlitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tissue N concentrations were not significantly different between equivalent perlite and PFH-containing substrates”
t0“tomato ( Lycopersicon esculentum Mill . )”
Claim · model-written summary
Vinca root dry weight did not differ significantly among substrates.
VincaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry root weights of vinca and geranium were not significantly different among plants grown in the substrates”
Claim · model-written summary
Geranium root dry weight did not differ significantly among substrates.
GeraniumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry root weights of vinca and geranium were not significantly different among plants grown in the substrates”
Claim · model-written summary
Tomato root dry weight was higher in 10%, 15%, 25%, 30%, and 35% PFH substrates than equivalent perlite substrates.
- Taxon
- TomatoSolanum lycopersicume0
- Treatment
- 10%, 15%, 25%, 30%, and 35% PFHe0
- Outcome
- dry root weightse0
- Direction
- significantly highere0
- Comparator
- equivalent perlite-containing substratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants grown in 10%, 15%, 25%, 30%, and 35% PFH had significantly higher dry root weights than those grown in equivalent perlite-containing substrates”
Claim · model-written summary
Impatiens root dry weight was higher in 35% PFH than 35% perlite.
ImpatiensOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Impatiens grown in 35% PFH had higher dry root weights than those grown in 35% perlite”
Claim · model-written summary
Marigold root dry weight was higher in 20% perlite than 20% PFH.
Verbatim
e0“Marigold grown in 20% perlite had higher dry root weights than those grown in 20% PFH”
Claim · model-written summary
At remaining rates, impatiens root dry weight did not differ between equivalent PFH and perlite substrates.
- Treatment
- PFHe0
- Outcome
- impatiense0
- Direction
- no significant differencese0
- Qualifier
- remaining substratese0
- Comparator
- perlitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were no significant differences in impatiens or marigold dry root weights among the remaining substrates containing equivalent amounts of PFH or perlite”
Claim · model-written summary
At remaining rates, marigold root dry weight did not differ between equivalent PFH and perlite substrates.
Verbatim
e0“there were no significant differences in impatiens or marigold dry root weights among the remaining substrates containing equivalent amounts of PFH or perlite”
Claim · model-written summary
Pansy root dry weight did not differ at 10%, 20%, 25%, 35%, and 40% perlite versus equivalent PFH rates.
Verbatim
e0“Dry root weights of pansy grown in 10%, 20% 25%, 35%, and 40% perlite were not significantly different from those grown in equivalent PFH-containing substrates”
Claim · model-written summary
Across substrates, impatiens root dry weight did not differ between perlite and PFH.
- Treatment
- perlite-containing substratese0
- Outcome
- root dry weights of impatiense0
- Direction
- not significantly differente0
- Comparator
- PFH-containing substratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Across substrates, root dry weights of impatiens, marigold, and pansy grown in perlite-containing substrates were not significantly different from those grown in PFH-containing substrates”
Claim · model-written summary
Across substrates, marigold root dry weight did not differ between perlite and PFH.
Verbatim
e0“Across substrates, root dry weights of impatiens, marigold, and pansy grown in perlite-containing substrates were not significantly different from those grown in PFH-containing substrates”
Claim · model-written summary
Across substrates, pansy root dry weight did not differ between perlite and PFH.
Verbatim
e0“Across substrates, root dry weights of impatiens, marigold, and pansy grown in perlite-containing substrates were not significantly different from those grown in PFH-containing substrates”
Claim · model-written summary
Vinca, geranium and impatiens shoot dry weight did not differ between equivalent perlite and PFH substrates.
- Treatment
- PFH-containing substratese0
- Outcome
- dry shoot weights of vinca, geranium, impatiense0
- Direction
- No significant differencee0
- Comparator
- perlitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant difference in dry shoot weights of vinca, geranium, impatiens, and marigold occurred between equivalent perlite and PFH-containing substrates”
Claim · model-written summary
Marigold shoot dry weight did not differ between equivalent perlite and PFH substrates.
Verbatim
e0“No significant difference in dry shoot weights of vinca, geranium, impatiens, and marigold occurred between equivalent perlite and PFH-containing substrates”
Claim · model-written summary
Tomato shoot dry weight was higher with 20% to 40% perlite than equivalent PFH.
- Taxon
- TomatoSolanum lycopersicume0
- Treatment
- 20% to 40% perlitee0
- Outcome
- dry shoot weightse0
- Direction
- significantly highere0
- Comparator
- equivalent PFH-containing substratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants grown in 20% to 40% perlite had significantly higher dry shoot weights than those grown in equivalent PFH-containing substrates”
Claim · model-written summary
Tomato shoot dry weight did not differ at 10% to 15% perlite versus PFH.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- 10% to 15% perlitee0
- Outcome
- dry shoot weightse0
- Direction
- not significantly differente0
- Comparator
- equivalent PFH-containing substratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dry shoot weights of tomato grown in 10% to 15% perlite were not significantly different from those grown in equivalent PFH-containing substrates”
Claim · model-written summary
Pansy shoot dry weight did not differ at specified perlite rates versus equivalent PFH.
Verbatim
e0“Dry shoot weights of pansy grown in 10%, 25%, 30%, 35%, and 40% perlite were not significantly different from those grown in equivalent PFH substrates”
The same questions in other papers
growing medium · growth · ImpatiensPositive and negative results
7 reporting no difference from an alternative
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- positive
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See all 8 papers →growing medium · nutrient: content · Solanum lycopersicum (tomato)Positive and negative results
6 papers in the same direction as this paper · 34 reporting no difference from an alternative
- positive
- positive
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See all 41 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.