Abstract
With the aim of increasing home-grown crude protein production, a plot experiment was carried out on two dairy farms with five different seed mixtures of red clover (Trifolium pratense) and/or white clover (Trifolium repens) together with grass. The clover constituted in total 20% of the seed weight. There were three further N-application rates. The dry matter and the crude protein yield increased with an increasing proportion of red clover and a decreasing proportion of white clover in the seed mixture. This seems primarily to be an effect of a higher competitive strength of red clover. The red clover proportion in the dry matter seemed to be more dependent on the amount of seed in the mixture than white clover. With increasing N-application the dry matter yield increased, but the crude protein yield decreased. This decrease in crude protein yield was primarily due to an increasing proportion of grass with a low content of crude protein. The crude protein content of red and white clover was high and independent of N-rate during the whole growing season. The crude protein content of the grass increased with increasing N-rate in spring, but in the last part of the growing season the crude protein content decreased with increasing N-rate, which probably was due to a high N-transfer from the clover.
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Claims 11
Claim · model-written summary
Dry matter yield increased as red clover proportion increased and white clover proportion decreased.
- Material
- red clover and a decreasing proportion of white clovere0
- Outcome
- dry matter yielde1
- Direction
- increasede0
TrifoliumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The dry matter and the crude protein yield increased with an increasing proportion of red clover and a decreasing proportion of white clover in the seed mixture”
t0“White and red clover”
e1“With increasing N-application the dry matter yield increased”
Claim · model-written summary
Crude protein yield increased as red clover proportion increased and white clover proportion decreased.
- Material
- red clover and a decreasing proportion of white clovere0
- Outcome
- crude protein yielde0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The dry matter and the crude protein yield increased with an increasing proportion of red clover and a decreasing proportion of white clover in the seed mixture”
t0“White and red clover”
Claim · model-written summary
The authors attribute this yield response mainly to stronger competition by red clover.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This seems primarily to be an effect of a higher competitive strength of red clover”
e1“dry matter and the crude protein yield”
t0“White and red clover”
Claim · model-written summary
Red clover proportion in dry matter seemed more dependent on seed amount in the mixture than white clover proportion.
- Taxon
- red clover
Trifolium pratenset0 - Treatment
- amount of seed in the mixturee0
- Outcome
- red clover proportion in the dry mattere0
- Direction
- more dependente0
- Comparator
- white clovere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The red clover proportion in the dry matter seemed to be more dependent on the amount of seed in the mixture than white clover”
t0“red clover”
Claim · model-written summary
Increasing nitrogen application increased dry matter yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increasing N-application the dry matter yield increased”
t0“White and red clover”
Claim · model-written summary
Increasing nitrogen application decreased crude protein yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increasing N-application the dry matter yield increased, but the crude protein yield decreased”
t0“White and red clover”
Claim · model-written summary
The authors attribute the reduced crude protein yield mainly to more grass with low crude protein content.
- Outcome
- decrease in crude protein yielde0
- Qualifier
- increasing proportion of grass with a low content of crude proteine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This decrease in crude protein yield was primarily due to an increasing proportion of grass with a low content of crude protein”
t0“White and red clover”
Claim · model-written summary
Red and white clover crude protein content was high and independent of nitrogen rate throughout the season.
Verbatim
e0“The crude protein content of red and white clover was high and independent of N-rate during the whole growing season”
Claim · model-written summary
Grass crude protein content increased with nitrogen rate in spring.
- Taxon
- grasse0
- Treatment
- increasing N-ratee0
- Outcome
- crude protein contente0
- Direction
- increasede0
- Qualifier
- springe0
Not reportedComparator
Verbatim
e0“The crude protein content of the grass increased with increasing N-rate in spring”
Claim · model-written summary
Grass crude protein content decreased with nitrogen rate late in the growing season.
- Taxon
- grasse1
- Treatment
- increasing N-ratee0
- Outcome
- crude protein contente0
- Direction
- decreasede0
- Qualifier
- last part of the growing seasone0
Not reportedComparator
Verbatim
e0“in the last part of the growing season the crude protein content decreased with increasing N-rate”
e1“the grass”
Claim · model-written summary
The authors suggest high nitrogen transfer from clover explained the late-season grass protein decline.
Verbatim
e0“which probably was due to a high N-transfer from the clover”
e1“crude protein content decreased with increasing N-rate”
e2“the grass”
The same questions in other papers
nitrogen · quality: protein · TrifoliumPositive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
nitrogen · yield · TrifoliumPositive and negative results
2 papers in the same direction as this paper · 8 in the opposite direction
- negative
- no effect
- negative
7 papers more in this group
See all 11 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.