Abstract
Abstract Stand maintenance of alfalfa ( Medicago sativa L.) relies on the persistence of the original plants. Yield (yield per plant, yield per shoot) and stand components (plants per square meter, shoots per square meter, shoots per plant) were studied in two experiments designed to determine yield response to P on a low P soil (Windthorst fine sandy loam; fine, mixed, thermic, Udic Paleustalfs) near Stephenville, TX. Three preplant incorporated rates of P (0, 29, and 59 kg ha −1 ) and five annual surface broadcast rates of P (0, 7, 15, 29, 59 kg ha −1 ) were applied to two field experiments established in September 1988 and 1989. The experimental design was a split plot in four randomized blocks. Whole plots were incorporated P rates and subplots were annual broadcast P rates. Plants and shoots per square meter were counted 4 and 8 wk after planting in 1988 and 1989, at each harvest in 1989 and 1990, and at the beginning and end of the season in 1991. Relative distribution of root mass to a 90‐cm depth was determined in the fall of 1990 and 1991 for selected treatments. Phosphorus incorporated before planting increased alfalfa dry matter (DM) yields more efficiently than did broadcast P. Plant and shoot densities did not differ among treatments; thus, low yields at low P levels were a function of reduced yield per shoot. Delayed application of P on fall‐planted alfalfa did not affect plant density. Under 0‐P, root mass was concentrated in the upper 20 cm of soil, whereas under adequate to high P, more root mass was distributed throughout the upper 40 to 50 cm.
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Claims 6
Claim · model-written summary
Preplant incorporated phosphorus increased alfalfa dry matter yield more efficiently than broadcast phosphorus.
- Taxon
- alfalfa
Medicago sativae0 - Treatment
- Phosphorus incorporated before plantinge1
- Outcome
- alfalfa dry matter (DM) yieldse1
- Direction
- increasede1
- Comparator
- broadcast Pe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.)”
e1“Phosphorus incorporated before planting increased alfalfa dry matter (DM) yields more efficiently than did broadcast P.”
Claim · model-written summary
Plant and shoot densities did not differ among phosphorus treatments.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- treatmentse1
- Outcome
- Plant and shoot densitiese1
- Direction
- did not differe1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.)”
e1“Plant and shoot densities did not differ among treatments”
Claim · model-written summary
Low phosphorus yield levels reflected lower yield per shoot.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- low P levelse1
- Outcome
- yield per shoote1
- Direction
- reducede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.)”
e1“low yields at low P levels were a function of reduced yield per shoot”
Claim · model-written summary
Delayed phosphorus application did not affect alfalfa plant density.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- Delayed application of Pe1
- Outcome
- plant densitye1
- Direction
- did not affecte1
- Qualifier
- fall‐plantede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.)”
e1“Delayed application of P on fall‐planted alfalfa did not affect plant density.”
Claim · model-written summary
Without phosphorus, alfalfa root mass was concentrated in the upper 20 cm of soil.
- Taxon
- alfalfaMedicago sativae0
- Organ / stage
- roote1
- Treatment
- 0‐Pe1
- Outcome
- root mass was concentrated in the upper 20 cm of soile1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.)”
e1“Under 0‐P, root mass was concentrated in the upper 20 cm of soil”
Claim · model-written summary
Under adequate to high phosphorus, more alfalfa root mass occurred throughout the upper 40 to 50 cm.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- adequate to high Pe1
- Outcome
- root masse1
- Direction
- moree1
- Value
- 40 to 50 cme1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa ( Medicago sativa L.)”
e1“under adequate to high P, more root mass was distributed throughout the upper 40 to 50 cm”
The same questions in other papers
phosphorus · growth · Medicago sativa (alfalfa)Results differ
35 papers in the same direction as this paper · 5 in the opposite direction · 2 reporting no difference from an alternative
- no effect
- positive
- negative
39 papers more in this group
See all 43 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.