Abstract
Abstract Environmental stresses adversely affect alfalfa (Medicago sativa L.) forage quality through altered plant development; however, the effects of soil nutrient stress on forage quality are not well known. The objective of this study was to determine what effect low soil phosphorus (P) had on alfalfa forage quality. Three preplant incorporated rates of P (0, 29, or 59 kg/ha) followed by five topdressed (during each production year) rates of P (0, 7, 15, 29, or 59 kg/ha)were applied to alfalfa established in two experiments in fall of 1988 and 1989. At each harvest in 1989 and 1990, mean stage by weight (MSW) was determined and forage samples were taken for neutral detergent fiber (NDF) and in vitro true digestibility (IVTD) analysis. In the 0‐ to 15‐cm soil layer, soil P concentrations averaged 6, 11, and 22 mg/kg of dry soil with 0, 29, and 59 kg P, respectively, incorporated. Soil P was not changed in the 15‐ to 30‐cm soil layer. Alfalfa herbage increased in P concentration with increasing P fertility level at some, but not all, harvests analyzed. Alfalfa maturity at harvest and NDF concentration increased with increasing P fertilizer rate, whereas IVTD decreased. Differences among treatments in NDF and IVTD probably were due to differences in plant maturity. Notes Contribution from the Texas Agricultural Experiment Station as Paper No. TA30473.
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Claims 6
Claim · model-written summary
In the upper soil layer, soil P concentrations averaged 6, 11, and 22 mg/kg of dry soil with 0, 29, and 59 kg P incorporated, respectively.
- Taxon
- alfalfa
Medicago sativat0 - Treatment
- 0, 29, and 59 kg P, respectively, incorporatede1
- Outcome
- soil P concentrationse1
- Direction
- increaseinferrede1
- Value
- 6, 11, and 22 mg/kg of dry soile1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e1“soil P concentrations averaged 6, 11, and 22 mg/kg of dry soil with 0, 29, and 59 kg P, respectively, incorporated”
Claim · model-written summary
Soil P was not changed in the deeper soil layer under alfalfa.
- Taxon
- alfalfaMedicago sativat0
- Outcome
- Soil Pe1
- Direction
- not changede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e1“Soil P was not changed”
Claim · model-written summary
Alfalfa herbage P concentration increased with increasing P fertility level at some, but not all, harvests analyzed.
- Taxon
- AlfalfaMedicago sativae1
- Treatment
- increasing P fertility levele1
- Outcome
- P concentratione1
- Direction
- increasede1
- Qualifier
- at some, but not all, harvests analyzede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Alfalfa herbage increased in P concentration with increasing P fertility level at some, but not all, harvests analyzed”
Claim · model-written summary
Alfalfa maturity at harvest and NDF concentration increased with increasing P fertilizer rate.
- Taxon
- AlfalfaMedicago sativae1
- Treatment
- increasing P fertilizer ratee1
- Outcome
- maturity at harvest and NDF concentratione1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Alfalfa maturity at harvest and NDF concentration increased with increasing P fertilizer rate”
Claim · model-written summary
In vitro true digestibility (IVTD) of alfalfa decreased with increasing P fertilizer rate.
- Taxon
- AlfalfaMedicago sativae1
- Treatment
- increasing P fertilizer ratee1
- Outcome
- IVTDe1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Alfalfa maturity at harvest and NDF concentration increased with increasing P fertilizer rate, whereas IVTD decreased”
Claim · model-written summary
The authors infer that differences among P treatments in NDF and IVTD probably were due to differences in plant maturity.
- Taxon
- alfalfaMedicago sativat0
- Outcome
- NDF and IVTDe1
- Qualifier
- differences in plant maturitye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e1“Differences among treatments in NDF and IVTD probably were due to differences in plant maturity”
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