Abstract
Recent studies showing a lack of response by alfalfa (Medicago sativa L.) to phosphorus (P) fertilization have raised concerns about the efficacy of commonly used P fertilizer materials in the southwestern United States. Studies were conducted between 1982 and 1985 in southeastern New Mexico to evaluate (i) alfalfa yield response to different P sources, (ii) the effect of P fertilizer source on forage total nitrogen (N) content and leafiness, and (iii) the effect of P fertilizer source on soil test P. Nine P sources were applied annually from 1982 through 1984 at a rate of 58 kg P/ha. Alfalfa was grown during 1985 without fertilization to examine the residual effect of P sources. Triple superphosphate (TSP) and monoammonium phosphate (MAP) gave the highest alfalfa forage yields over the 3‐year application period, but no residual fertilizer effects were observed when fertilization was discontinued. Fertilization did not affect forage leafiness. Except for a small N response in forage total N content in 1984, neither P nor concomitant applied N had a significant effect on forage N content over the 3‐year period. Phosphorus fertilization significantly increased average soil test P for the 3‐year period, but there were no significant differences between treatments. Currently used P materials (TSP and MAP) still appear to be the most efficacious for alfalfa production.
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Claims 9
Claim · model-written summary
Triple superphosphate gave among the highest alfalfa forage yields over three application years.
- Taxon
- alfalfa
Medicago sativat0 - Treatment
- Triple superphosphate (TSP)e0
- Outcome
- alfalfa forage yieldse0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Triple superphosphate (TSP) and monoammonium phosphate (MAP) gave the highest alfalfa forage yields over the 3‐year application period”
t0“alfalfa”
Claim · model-written summary
Monoammonium phosphate gave among the highest alfalfa forage yields over three application years.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- monoammonium phosphate (MAP)e0
- Outcome
- alfalfa forage yieldse0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Triple superphosphate (TSP) and monoammonium phosphate (MAP) gave the highest alfalfa forage yields over the 3‐year application period”
t0“alfalfa”
Claim · model-written summary
No residual fertilizer effects were observed after fertilization stopped.
- Taxon
- alfalfaMedicago sativat0
- Outcome
- residual fertilizer effectse0
- Direction
- noe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no residual fertilizer effects were observed when fertilization was discontinued”
t0“alfalfa”
Claim · model-written summary
Fertilization did not affect forage leafiness.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- Fertilizatione0
- Outcome
- forage leafinesse0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilization did not affect forage leafiness”
t0“alfalfa”
Claim · model-written summary
Forage total nitrogen showed a small nitrogen response in 1984.
- Taxon
- alfalfaMedicago sativat0
- Outcome
- forage total N contente0
- Qualifier
- in 1984e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a small N response in forage total N content in 1984”
t0“alfalfa”
Claim · model-written summary
Aside from 1984, applied phosphorus and concomitant nitrogen had no significant effect on forage nitrogen content.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- P nor concomitant applied Ne0
- Outcome
- forage N contente0
- Direction
- neithere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“neither P nor concomitant applied N had a significant effect on forage N content over the 3‐year period”
t0“alfalfa”
Claim · model-written summary
Phosphorus fertilization significantly increased average soil test phosphorus.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- Phosphorus fertilizatione0
- Outcome
- soil test Pe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus fertilization significantly increased average soil test P for the 3‐year period”
t0“alfalfa”
Claim · model-written summary
Soil test phosphorus did not differ significantly among fertilizer treatments.
- Taxon
- alfalfaMedicago sativat1
- Outcome
- soil test phosphorust0
- Direction
- no significant differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were no significant differences between treatments”
t0“soil test phosphorus”
t1“alfalfa”
Claim · model-written summary
The authors judged TSP and MAP the most efficacious materials for alfalfa production.
- Taxon
- alfalfaMedicago sativae0
- Outcome
- most efficacious for alfalfa productione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Currently used P materials (TSP and MAP) still appear to be the most efficacious for alfalfa production”
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See all 22 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.