Abstract
Abstract Fall regrowth of alfalfa ( Medicago sativa L.) frequently is harvested for hay in the southern plains. Possible detrimental effects of harvesting from mid‐September to late November have not been studied. The objective of this research was to determine the effects of fall cutting dates on root total nonstructural carbohydrate (TNC) concentrations, productivity, and stand persistence of semi‐dormant, dryland alfalfa in the southern plains. From 1978 to 1980, five fall cutting date treatments were imposed on a 4‐year‐old stand of ‘Kanza’ and 2‐year‐old stands of ‘Arc’ and ‘Liberty’ alfalfas grown under dryland conditions on a fine, mixed thermic, Pachic Arguistolls (McClain silt loam). Three harvests per season were made at 10 to 25% bloom prior to the fall cutting date treatments which were made at fourth harvest of the season. Root carbohydrate analyses were made on roots dug 7 December of each year. Forage yields were taken during each growing season subsequent to fall cutting date treatments with a residual harvest taken in April 1981. Stand densities were determined at initiation of the study in 1978 and each fall thereafter. Final stand densities were determined in May 1981. Only forage yields were determined for Liberty. Fall cutting date treatments had little effect on root carbohydrate reserves. Roots dug in 1978 had higher TNC percentages than those dug in 1979 or 1980; however, fall cutting date treatments significantly influenced TNC concentrations only in the fall of 1979. Fall cutting date treatments had a greater effect on first harvest in the subsequent spring than on total yields. Total yields for each season and total yields over the duration of the study for each cultivar indicate that harvesting could take place at any fall date with little effect on productivity in subsequent years. Stands of all cultivars declined over the course of study and at the conclusion of the study in May, 1981 there were no differences in stand persistence that could be attributed to fall cutting date treatments.
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Claims 8
Claim · model-written summary
Fall cutting dates had little effect on alfalfa root carbohydrate reserves.
- Taxon
- alfalfa
Medicago sativae1 - Treatment
- Fall cutting date treatmentse0
- Outcome
- root carbohydrate reservese0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fall cutting date treatments had little effect on root carbohydrate reserves”
e1“alfalfa ( Medicago sativa L.)”
Claim · model-written summary
Roots dug in 1978 had higher TNC percentages than those dug in 1979 or 1980.
- Taxon
- alfalfaMedicago sativae1
- Organ / stage
- Rootse0
- Outcome
- TNC percentagese0
- Direction
- highere0
- Comparator
- 1979 or 1980e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Roots dug in 1978 had higher TNC percentages than those dug in 1979 or 1980”
e1“alfalfa ( Medicago sativa L.)”
Claim · model-written summary
Fall cutting dates significantly influenced TNC concentrations only in fall 1979.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- fall cutting date treatmentse0
- Outcome
- TNC concentrationse0
- Qualifier
- only in the fall of 1979e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fall cutting date treatments significantly influenced TNC concentrations only in the fall of 1979”
e1“alfalfa ( Medicago sativa L.)”
Claim · model-written summary
Fall cutting dates affected first harvest the next spring more than total yields.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- Fall cutting date treatmentse0
- Outcome
- first harvest in the subsequent springe0
- Direction
- greater effecte0
- Comparator
- total yieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fall cutting date treatments had a greater effect on first harvest in the subsequent spring than on total yields”
e1“alfalfa ( Medicago sativa L.)”
Claim · model-written summary
Harvesting at any fall date had little effect on subsequent productivity.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- harvesting could take place at any fall datee0
- Outcome
- productivity in subsequent yearse0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“harvesting could take place at any fall date with little effect on productivity in subsequent years”
e1“alfalfa ( Medicago sativa L.)”
Claim · model-written summary
Stands of all cultivars declined over the study.
- Taxon
- alfalfaMedicago sativae1
- Material
- all cultivarse0
- Outcome
- Standse0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stands of all cultivars declined over the course of study”
e1“alfalfa ( Medicago sativa L.)”
Claim · model-written summary
Final stand persistence did not differ by fall cutting date.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- fall cutting date treatmentse0
- Outcome
- stand persistencee0
- Direction
- no differencese0
- Qualifier
- in May, 1981e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at the conclusion of the study in May, 1981 there were no differences in stand persistence that could be attributed to fall cutting date treatments”
e1“alfalfa ( Medicago sativa L.)”
Claim · model-written summary
The authors concluded fall harvesting can occur at any date with little later productivity effect.
- Taxon
- alfalfaMedicago sativae1
- Outcome
- harvesting could take place at any fall datee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“harvesting could take place at any fall date with little effect on productivity in subsequent years”
e1“alfalfa ( Medicago sativa L.)”
The same questions in other papers
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