Abstract
SYNOPSIS Recent expansion of the timber industry into areas previously used for agronomic production has, in many cases, resulted in poor growth of Pinus patula and P. elliottii seedlings and in certain instances complete stand failure. A bioassay study was initiated to evaluate the efficacy of soluble fertiliser in ameliorating the allelopathic effects of a water soluble corn (Zea mays) stover extract on the growth of lettuce (Lactuca sativa) seedlings. In addition, a potted trial was undertaken to evaluate the influence of nitrogen (N) and phosphorus (P) fertiliser sources in overcoming P. patula mortality on soil previously under agricultural production. Lettuce root mass and length was significantly reduced in the presence of the corn stover extract. However, partial recovery in root mass was achieved with additions of a soluble fertiliser. The main effect of fertiliser additions was the stimulation of lettuce shoot growth. The application of 100 mg/kg N to P. patula seedlings grown in pots resulted in highly significant increases in shoot growth. In addition, steam sterilisation and the use of various commercially available fertiliser sources resulted in significant increases in shoot growth over those treatments receiving no fertilisation. No significant response to P additions was observed. Results from foliar analyses clearly indicated that seedlings growing on untreated soil were N deficient (1,05% N). Foliar phosphorus was considered to be sufficient for adequate pine growth. The evidence indicates that the poor performance of P. patula seedlings growing on ex-agricultural lands can be amended by the application of N and that this may be the primary factor affecting stand establishment on these sites.
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Claims 11
Claim · model-written summary
Corn stover extract significantly reduced lettuce root mass.
- Taxon
- Lettuce
Lactuca sativae0 - Treatment
- corn stover extracte0
- Outcome
- root masse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce root mass and length was significantly reduced in the presence of the corn stover extract”
Claim · model-written summary
Corn stover extract significantly reduced lettuce root length.
- Taxon
- LettuceLactuca sativae0
- Treatment
- corn stover extracte0
- Outcome
- lengthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce root mass and length was significantly reduced in the presence of the corn stover extract”
Claim · model-written summary
Soluble fertiliser partially restored lettuce root mass.
- Taxon
- lettuceLactuca sativae1
- Treatment
- additions of a soluble fertilisere0
- Outcome
- root masse0
- Direction
- partial recoverye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“partial recovery in root mass was achieved with additions of a soluble fertiliser”
e1“lettuce (Lactuca sativa) seedlings”
Claim · model-written summary
Fertiliser stimulated lettuce shoot growth.
- Taxon
- lettuceLactuca sativae0
- Treatment
- fertiliser additionse0
- Outcome
- lettuce shoot growthe0
- Direction
- stimulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertiliser additions was the stimulation of lettuce shoot growth”
Claim · model-written summary
Nitrogen application significantly increased pine shoot growth.
- Taxon
- P. patula
Pinus patulae0 - Treatment
- 100 mg/kg Ne0
- Outcome
- shoot growthe0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of 100 mg/kg N to P. patula seedlings grown in pots resulted in highly significant increases in shoot growth”
Claim · model-written summary
Steam sterilisation significantly increased pine shoot growth over no fertilisation.
- Taxon
- Pinus patulaPinus patulat0
- Treatment
- steam sterilisatione0
- Outcome
- shoot growthe0
- Direction
- increasese0
- Comparator
- no fertilisatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“steam sterilisation and the use of various commercially available fertiliser sources resulted in significant increases in shoot growth over those treatments receiving no fertilisation”
t0“Pinus patula”
Claim · model-written summary
Commercial fertilisers significantly increased pine shoot growth over no fertilisation.
- Taxon
- Pinus patulaPinus patulat0
- Treatment
- various commercially available fertiliser sourcese0
- Outcome
- shoot growthe0
- Direction
- increasese0
- Comparator
- no fertilisatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“various commercially available fertiliser sources resulted in significant increases in shoot growth over those treatments receiving no fertilisation”
t0“Pinus patula”
Claim · model-written summary
Phosphorus additions elicited no significant response.
- Taxon
- Pinus patulaPinus patulat0
- Treatment
- P additionse0
- Outcome
- responsee0
- Direction
- No significant responsee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant response to P additions was observed”
t0“Pinus patula”
Claim · model-written summary
Untreated pine seedlings were nitrogen deficient at 1,05% N.
- Taxon
- Pinus patulaPinus patulat0
- Treatment
- untreated soile0
- Outcome
- N deficiente0
- Value
- 1,05% Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedlings growing on untreated soil were N deficient (1,05% N)”
t0“Pinus patula”
Claim · model-written summary
Foliar phosphorus was sufficient for pine growth.
- Taxon
- Pinus patulaPinus patulat0
- Outcome
- Foliar phosphoruse0
- Qualifier
- sufficient for adequate pine growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar phosphorus was considered to be sufficient for adequate pine growth”
t0“Pinus patula”
Claim · model-written summary
Authors infer that nitrogen application can improve poor pine establishment on former agricultural land.
- Taxon
- P. patulaPinus patulae0
- Outcome
- amended by the application of Ne0
- Setting
- ex-agricultural landse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“poor performance of P. patula seedlings growing on ex-agricultural lands can be amended by the application of N”
The same questions in other papers
Zea mays subsp. mays · growth · Lactuca sativa (garden lettuce)Results agree
2 papers in the same direction as this paper
- negative
- negative
nitrogen · growth · Pinus patula (Mexican weeping pine)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
fertilization · growth · Lactuca sativa (garden lettuce)Positive and negative results
201 papers in the same direction as this paper · 45 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- negative
244 papers more in this group
See all 248 papers →botanical · growth · Lactuca sativa (garden lettuce)Positive and negative results
156 papers in the same direction as this paper · 114 in the opposite direction
- positive
- positive
- positive
267 papers more in this group
See all 271 papers →fertilization · growth · Pinus patula (Mexican weeping pine)Results agree
1 paper in the same direction as this paper
- positive
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.