Abstract
Abstract Tall fescue is an important temperate grassland species globally, but in many regions the effects of drought, heat and poor grazing management, reduce its persistence in summer. Furthermore, poor ground cover and low tiller population density (TP) in winter result in low radiation capture and thus limited potential to increase the low growth rates at that time. Knowledge of the effect of fertilization, defoliation managements and establishment methods on demography of tall fescue would help to improve sward management for better persistence and winter growth. Accordingly, an experiment was carried out in Pergamino, Argentina, to study the effects of two N‐ fertilizer levels, two grazing frequencies and two seeding row arrangements upon tall fescue TP demography. Herbage mass, tiller appearance (TA) and death rates were measured over 3 years. Seasonal fluctuations in TA and death rates determined well‐defined periods of increase and decrease in TP density. Maximum values were found at the end of winter and minimum ones at the end of spring, after the reproductive period. Nitrogen shortage and high herbage mass limited TA. Tiller death rate followed TA rate and was affected by nitrogen supply and defoliation frequency in the same way that TA was. Sowing arrangement affected tiller demography at the beginning of the experiment.
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Claims 8
Claim · model-written summary
Tiller population density values were maximal at the end of winter.
- Taxon
- tall fescue
Lolium arundinaceumt0 - Outcome
- valuese1
- Direction
- Maximume1
- Qualifier
- at the end of wintere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tall fescue”
e1“Maximum values were found at the end of winter and minimum ones at the end of spring, after the reproductive period”
Claim · model-written summary
Tiller population density values were minimal at the end of spring, after the reproductive period.
- Taxon
- tall fescueLolium arundinaceumt0
- Outcome
- valuese1
- Direction
- minimume1
- Qualifier
- at the end of spring, after the reproductive periode1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tall fescue”
e1“Maximum values were found at the end of winter and minimum ones at the end of spring, after the reproductive period”
Claim · model-written summary
Nitrogen shortage limited tiller appearance.
- Taxon
- tall fescueLolium arundinaceumt0
- Treatment
- Nitrogen shortagee3
- Outcome
- TAe3
- Direction
- limitede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tall fescue”
e3“Nitrogen shortage and high herbage mass limited TA”
Claim · model-written summary
High herbage mass limited tiller appearance.
- Taxon
- tall fescueLolium arundinaceumt0
- Treatment
- high herbage masse3
- Outcome
- TAe3
- Direction
- limitede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tall fescue”
e3“Nitrogen shortage and high herbage mass limited TA”
Claim · model-written summary
Tiller death rate was affected by nitrogen supply in the same way as tiller appearance.
- Taxon
- tall fescueLolium arundinaceumt0
- Treatment
- nitrogen supplye4
- Outcome
- Tiller death ratee4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tall fescue”
e4“Tiller death rate followed TA rate and was affected by nitrogen supply and defoliation frequency in the same way that TA was”
Claim · model-written summary
Tiller death rate was affected by defoliation frequency in the same way as tiller appearance.
- Taxon
- tall fescueLolium arundinaceumt0
- Treatment
- defoliation frequencye4
- Outcome
- Tiller death ratee4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tall fescue”
e4“Tiller death rate followed TA rate and was affected by nitrogen supply and defoliation frequency in the same way that TA was”
Claim · model-written summary
Tiller death rate followed the tiller appearance rate.
- Taxon
- tall fescueLolium arundinaceumt0
- Outcome
- Tiller death ratee4
- Comparator
- TA ratee4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tall fescue”
e4“Tiller death rate followed TA rate and was affected by nitrogen supply and defoliation frequency in the same way that TA was”
Claim · model-written summary
Sowing arrangement affected tiller demography at the beginning of the experiment.
- Taxon
- tall fescueLolium arundinaceumt0
- Treatment
- Sowing arrangemente5
- Outcome
- tiller demographye5
- Qualifier
- at the beginning of the experimente5
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tall fescue”
e5“Sowing arrangement affected tiller demography at the beginning of the experiment”
The same questions in other papers
nitrogen · yield · Lolium arundinaceum (tall fescue)Positive and negative results
4 papers in the same direction as this paper · 26 in the opposite direction
- positive
- positive
- positive
27 papers more in this group
See all 31 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.