Abstract
Abstract Soil acidity is a major cause of reduced yields of alfalfa ( Medicago sativa L.) in the southeastern United States. The purpose of this study was to determine if alfalfa could be grown successfully on acid soils if sufficient Ca, N, Mo, and surface lime were provided. ‘Arc’ alfalfa was planted in March 1985 in a split‐plot design on an Aquic Fragiudult soil. Treatments included surface and incorporated dolomitic lime at either 6.5 or 13.0 Mg ha −1 , gypsum at 13.0 Mg ha −1 . In addition, each plot was split, with half of the plot receiving 224 kg N ha −1 and half receiving no N. Compared to the control, surface application of lime increased yields of alfalfa in both 1985 and 1986. Yields increased in response to addition of either N or Mo, indicating the importance of Mo in establishing the alfalfa nodule system for N assimilation. Soil pH averaged 4.8 and 6.7, and exchangeable AI averaged 2 and 21 mg kg −1 in the surface 5 cm of the limed and unlimed plots, respectively. The results of this study indicate that surface lime application is adequate for alfalfa establishment and production on acid soils, and that reduced N fixation appears to be a major limiting factor to growth of alfalfa on acid soils.
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Claims 7
Claim · model-written summary
Surface application of lime increased alfalfa yields compared with the control in both 1985 and 1986.
- Taxon
- alfalfa
Medicago sativae0 - Treatment
- surface application of limee1
- Outcome
- yieldse1
- Direction
- increasede1
- Qualifier
- in both 1985 and 1986e1
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil acidity is a major cause of reduced yields of alfalfa ( Medicago sativa L.) in the southeastern United States”
e1“Compared to the control, surface application of lime increased yields of alfalfa in both 1985 and 1986”
Claim · model-written summary
Nitrogen addition of 224 kg N ha −1 increased alfalfa yields compared with no N.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- 224 kg N ha −1e6
- Outcome
- yieldse2
- Direction
- increasede2
- Comparator
- no Ne6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil acidity is a major cause of reduced yields of alfalfa ( Medicago sativa L.) in the southeastern United States”
e2“Yields increased in response to addition of either N or Mo, indicating the importance of Mo in establishing the alfalfa nodule system for N assimilation”
e6“each plot was split, with half of the plot receiving 224 kg N ha −1 and half receiving no N”
Claim · model-written summary
Molybdenum addition increased alfalfa yields compared with the control.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil acidity is a major cause of reduced yields of alfalfa ( Medicago sativa L.) in the southeastern United States”
e1“Compared to the control, surface application of lime increased yields of alfalfa in both 1985 and 1986”
e2“Yields increased in response to addition of either N or Mo, indicating the importance of Mo in establishing the alfalfa nodule system for N assimilation”
Claim · model-written summary
Soil pH averaged 4.8 and 6.7 in the surface soil of the limed and unlimed plots, respectively.
- Taxon
- alfalfaMedicago sativae0
- Outcome
- Soil pHe3
- Value
- 4.8 and 6.7e3
- Qualifier
- limed and unlimed plotse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil acidity is a major cause of reduced yields of alfalfa ( Medicago sativa L.) in the southeastern United States”
e3“Soil pH averaged 4.8 and 6.7, and exchangeable AI averaged 2 and 21 mg kg −1 in the surface 5 cm of the limed and unlimed plots, respectively”
Claim · model-written summary
Exchangeable Al averaged 2 and 21 mg kg −1 in the surface soil of the limed and unlimed plots, respectively.
- Taxon
- alfalfaMedicago sativae0
- Outcome
- exchangeable AIe3
- Value
- 2 and 21 mg kg −1e3
- Qualifier
- limed and unlimed plotse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil acidity is a major cause of reduced yields of alfalfa ( Medicago sativa L.) in the southeastern United States”
e3“Soil pH averaged 4.8 and 6.7, and exchangeable AI averaged 2 and 21 mg kg −1 in the surface 5 cm of the limed and unlimed plots, respectively”
Claim · model-written summary
Reduced N fixation appears to be a major limiting factor to alfalfa growth on acid soils.
- Taxon
- alfalfaMedicago sativae0
- Outcome
- growth of alfalfae4
- Qualifier
- reduced N fixatione4
- Setting
- acid soilse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil acidity is a major cause of reduced yields of alfalfa ( Medicago sativa L.) in the southeastern United States”
e4“reduced N fixation appears to be a major limiting factor to growth of alfalfa on acid soils”
Claim · model-written summary
Surface lime application is adequate for alfalfa establishment and production on acid soils.
- Taxon
- alfalfaMedicago sativae5
- Treatment
- surface lime applicatione5
- Outcome
- establishment and productione5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“surface lime application is adequate for alfalfa establishment and production on acid soils”
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See all 50 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.