Abstract
The effects of four rates of N and P fertilizers applied in the spring to alfalfa and crested wheatgrass, grown singly and in mixture, at three ages of stand were investigated. N fertilizer increased yields and protein content of the grass in the year of application regardless of age of stand; the effect in subsequent years depended upon the level of yield in the year of application. The results indicated that grass should be fertilized with N every year at a rate related to the amounts of N removed from the soil in the preceding year. N fertilizer also increased the yield of the mixture in the year of application. The proportion of alfalfa in the hay mixture decreased with age and with applications of N fertilizer. This effect of N fertilizer was brought about by changes in the absolute yield of the grass component but not that of the alfalfa component of the mixture. The management of the mixture is affected by management of the grass component and any increases in yield and quality of the grass are at the expense of the alfalfa. P fertilizer slightly increased the P content of all forages, regardless of age of stand, both in the year of application and in the succeeding years, but did not increase yields.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
N fertilizer increased crested wheatgrass yields and protein content in the year of application, regardless of stand age.
- Taxon
- CRESTED WHEATGRASS
Agropyron cristatumt0 - Treatment
- N fertilizere1
- Outcome
- yields and protein contente1
- Direction
- increasede1
- Qualifier
- in the year of application regardless of age of stande1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“N fertilizer increased yields and protein content of the grass in the year of application regardless of age of stand”
t0“CRESTED WHEATGRASS”
Claim · model-written summary
The N fertilizer effect on crested wheatgrass in later years depended on the yield level of the application year.
- Taxon
- CRESTED WHEATGRASSAgropyron cristatumt0
- Outcome
- effect in subsequent yearse2
- Qualifier
- depended upon the level of yield in the year of applicatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“the effect in subsequent years depended upon the level of yield in the year of application”
t0“CRESTED WHEATGRASS”
Claim · model-written summary
Crested wheatgrass should be fertilized with N every year at a rate related to the N removed from the soil the year before.
- Taxon
- CRESTED WHEATGRASSAgropyron cristatumt0
- Treatment
- at a rate related to the amounts of N removed from the soil in the preceding yeare3
- Outcome
- fertilized with N every yeare3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“grass should be fertilized with N every year at a rate related to the amounts of N removed from the soil in the preceding year”
t0“CRESTED WHEATGRASS”
Claim · model-written summary
N fertilizer increased the yield of the alfalfa and crested wheatgrass mixture in the year of application.
- Taxon
- ALFALFA AND CRESTED WHEATGRASSt0
- Treatment
- N fertilizere4
- Outcome
- yield of the mixturee4
- Direction
- increasede4
- Qualifier
- in the year of applicatione4
Not reportedComparator
Verbatim
e4“N fertilizer also increased the yield of the mixture in the year of application”
t0“ALFALFA AND CRESTED WHEATGRASS”
Claim · model-written summary
N fertilizer applications decreased the alfalfa proportion in the hay mixture.
- Taxon
- alfalfa
Medicago sativat0 - Treatment
- applications of N fertilizere5
- Outcome
- proportion of alfalfa in the hay mixturee5
- Direction
- decreasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“The proportion of alfalfa in the hay mixture decreased with age and with applications of N fertilizer”
t0“ALFALFA AND CRESTED WHEATGRASS”
Claim · model-written summary
The alfalfa proportion in the hay mixture decreased with stand age.
- Taxon
- alfalfaMedicago sativat0
- Outcome
- proportion of alfalfa in the hay mixturee5
- Direction
- decreasede5
- Qualifier
- with agee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“The proportion of alfalfa in the hay mixture decreased with age and with applications of N fertilizer”
t0“ALFALFA AND CRESTED WHEATGRASS”
Claim · model-written summary
The N fertilizer effect on the mixture came from changes in grass yield, not alfalfa yield.
- Taxon
- alfalfaMedicago sativae6
- Treatment
- N fertilizere6
- Outcome
- absolute yield of the grass component but not that of the alfalfa componente6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“This effect of N fertilizer was brought about by changes in the absolute yield of the grass component but not that of the alfalfa component of the mixture”
t0“ALFALFA AND CRESTED WHEATGRASS”
Claim · model-written summary
Increases in grass yield and quality came at the expense of alfalfa.
- Taxon
- alfalfaMedicago sativae7
- Outcome
- yield and quality of the grasse7
- Direction
- increasese7
- Qualifier
- at the expense of the alfalfae7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“any increases in yield and quality of the grass are at the expense of the alfalfa”
t0“ALFALFA AND CRESTED WHEATGRASS”
Claim · model-written summary
P fertilizer slightly increased the P content of forages, regardless of stand age and season.
- Taxon
- foragese0
- Treatment
- P fertilizere0
- Outcome
- P contente0
- Direction
- increasede0
- Qualifier
- regardless of age of stand, both in the year of application and in the succeeding yearse0
Not reportedComparator
Verbatim
e0“P fertilizer slightly increased the P content of all forages, regardless of age of stand, both in the year of application and in the succeeding years, but did not increase yields”
Claim · model-written summary
P fertilizer did not increase forage yields.
Not reportedComparator
Verbatim
e0“P fertilizer slightly increased the P content of all forages, regardless of age of stand, both in the year of application and in the succeeding years, but did not increase yields”
The same questions in other papers
fertilization · yield · Agropyron cristatum (crested wheatgrass)Results differ
9 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
8 papers more in this group
See all 12 papers →fertilization · yield · Medicago sativa (alfalfa)Positive and negative results
150 papers in the same direction as this paper · 30 in the opposite direction · 3 reporting no difference from an alternative
- negative
- positive
- negative
180 papers more in this group
See all 184 papers →fertilization · quality: protein · Agropyron cristatum (crested wheatgrass)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.