Abstract
Abstract The establishment of productive alfalfa ( Medicago sativa L.) stands is greatly dependent on competition by other plant species and on the seedling development of the forage legume. The objective of this study was to determine the effects of weed control methods in combination with N fertilization rate on seedling growth and nodulation of alfalfa. ‘Saranac’ alfalfa was established on check (no weed control), handweeded, and herbicide 4‐(2,4‐ dichlorophenoxy)butyric acid + 2,2‐dichloropropionic acid (2,4‐DB ‐f‐ dalapon) plots with N applied at 0, 25, 50 or 100 kg/ha at emergence of the forage legume. Dry matter (DM) yields of alfalfa in the first cutting were significantly increased by N applications of 25 to 50 kg/ha over the check in two out of three experiments. Nitrogen applied at seeding did not influence the DM yields of the second cutting. On plots treated with 2,4‐DB and dalapon, the DM yields of alfalfa in the first cutting were 30 to 81% and 11 to 78% of those of check and handweeded plots, respectively. In the second cutting, DM yields of alfalfa were not affected by the method of weed control. Weed growth was significantly increased by applied N in one experiment only. Nodule size was reduced by N applications of 50 and 100 kg/ha. Similarly, the number of nodules per plant was decreased in one experiment. Percent total N of alfalfa tissue was increased by applied N in the first cutting of two experiments. In the second cutting, high N rates resulted in a lower N content of alfalfa tissue which coincided with poor nodulation. The N rate ✕method of weed control interactions for most criteria were not statistically significant.
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Claims 12
Claim · model-written summary
Applying 25 to 50 kg/ha N increased first-cut alfalfa dry matter yield versus check in two of three experiments.
- Taxon
- alfalfa
Medicago sativae0 - Treatment
- N applications of 25 to 50 kg/hae0
- Outcome
- Dry matter (DM) yields of alfalfa in the first cuttinge0
- Direction
- increasede0
- Qualifier
- two out of three experimentse0
- Comparator
- checke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry matter (DM) yields of alfalfa in the first cutting were significantly increased by N applications of 25 to 50 kg/ha over the check in two out of three experiments.”
Claim · model-written summary
Nitrogen at seeding did not influence second-cut alfalfa dry matter yield.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- Nitrogen applied at seedinge0
- Outcome
- DM yields of the second cuttinge0
- Direction
- did not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa”
e0“Nitrogen applied at seeding did not influence the DM yields of the second cutting.”
Claim · model-written summary
Alfalfa first-cut dry matter yield on 2,4-DB and dalapon plots was 30 to 81% of check plots.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- 2,4‐DB and dalapone0
- Outcome
- DM yields of alfalfa in the first cuttinge0
- Value
- 30 to 81%e0
- Comparator
- checke0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On plots treated with 2,4‐DB and dalapon, the DM yields of alfalfa in the first cutting were 30 to 81% and 11 to 78% of those of check and handweeded plots, respectively.”
Claim · model-written summary
Alfalfa first-cut dry matter yield on 2,4-DB and dalapon plots was 11 to 78% of handweeded plots.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- 2,4‐DB and dalapone0
- Outcome
- DM yields of alfalfa in the first cuttinge0
- Value
- 11 to 78%e0
- Comparator
- handweeded plotse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On plots treated with 2,4‐DB and dalapon, the DM yields of alfalfa in the first cutting were 30 to 81% and 11 to 78% of those of check and handweeded plots, respectively.”
Claim · model-written summary
Weed control method did not affect second-cut alfalfa dry matter yield.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- method of weed controle0
- Outcome
- DM yields of alfalfae0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa”
e0“In the second cutting, DM yields of alfalfa were not affected by the method of weed control.”
Claim · model-written summary
Applied N significantly increased weed growth in one experiment only.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- applied Ne0
- Outcome
- Weed growthe0
- Direction
- increasede0
- Qualifier
- one experiment onlye0
Not reportedInteractorInteractor roleComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa”
e0“Weed growth was significantly increased by applied N in one experiment only.”
Claim · model-written summary
N applications of 50 and 100 kg/ha reduced alfalfa nodule size.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- N applications of 50 and 100 kg/hae0
- Outcome
- Nodule sizee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa”
e0“Nodule size was reduced by N applications of 50 and 100 kg/ha.”
Claim · model-written summary
Alfalfa nodule number per plant decreased in one experiment.
- Taxon
- AlfalfaMedicago sativat0
- Outcome
- number of nodules per plante0
- Direction
- decreasede0
- Qualifier
- one experimente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa”
e0“Similarly, the number of nodules per plant was decreased in one experiment.”
Claim · model-written summary
Applied N increased alfalfa tissue percent total N at first cutting in two experiments.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- applied Ne0
- Outcome
- Percent total N of alfalfa tissuee0
- Direction
- increasede0
- Qualifier
- first cutting of two experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Percent total N of alfalfa tissue was increased by applied N in the first cutting of two experiments.”
Claim · model-written summary
High N rates lowered alfalfa tissue N content at second cutting.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- high N ratese0
- Outcome
- N content of alfalfa tissuee0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the second cutting, high N rates resulted in a lower N content of alfalfa tissue which coincided with poor nodulation.”
Claim · model-written summary
Lower alfalfa tissue N content under high N at second cutting coincided with poor nodulation.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- high N ratese0
- Outcome
- N content of alfalfa tissuee0
- Direction
- lowere0
- Qualifier
- poor nodulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the second cutting, high N rates resulted in a lower N content of alfalfa tissue which coincided with poor nodulation.”
Claim · model-written summary
N rate by weed control method interactions were not statistically significant for most criteria.
- Taxon
- AlfalfaMedicago sativat0
- Outcome
- N rate ✕method of weed control interactionse0
- Qualifier
- most criteriae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa”
e0“The N rate ✕method of weed control interactions for most criteria were not statistically significant.”
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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.