Abstract
Understanding how the seed production of rhizomatous, perennial grasses responds to fall N application is important for agronomic practices. In this study, a split‐plot design with three replicates was used to determine the impacts of time of N application in fall (early‐vegetative stage, mid‐vegetative stage, or end of the growing season) and the N application rate (0, 28, and 56 kg N ha –1 ) on seed production in Leymus chinensis (Trin.) Tzvel. In contrast to N applied at the end of the growing season, N application at the early‐vegetative stage significantly increased the inflorescence number (28%) but had little influence on the seed number per inflorescence and 1000‐seed weight. Compared with the 0 kg N ha –1 treatment, the highest N application rate significantly increased the inflorescence number (118%), the seed number per inflorescence (65%), the 1000‐seed weight (9%), and the fall tiller density (121%). The increased inflorescence number was closely associated with the increased number of fall tillers and the ratio of reproductive growth to vegetative growth in these tillers. All fall tillers had the ability to head in the following year if there was enough precipitation at the end of the growing season and during the winter. The results suggest that the method of first applying N during the early fall and then watering at the end of the growing season will greatly improve the seed yield in L. chinensis .
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Claims 9
Claim · model-written summary
Early fall nitrogen increased inflorescence number by 28% relative to end-of-season application.
Verbatim
e0“In contrast to N applied at the end of the growing season, N application at the early‐vegetative stage significantly increased the inflorescence number (28%)”
t0“Leymus chinensis”
Claim · model-written summary
Early fall nitrogen had little influence on seed number per inflorescence and 1000-seed weight.
- Taxon
- Leymus chinensisLeymus chinensist0
- Treatment
- N application at the early‐vegetative stagee0
- Outcome
- seed number per inflorescence and 1000‐seed weighte0
- Direction
- little influencee0
Not reportedComparator
Verbatim
e0“N application at the early‐vegetative stage significantly increased the inflorescence number (28%) but had little influence on the seed number per inflorescence and 1000‐seed weight”
t0“Leymus chinensis”
Claim · model-written summary
The highest nitrogen rate increased inflorescence number by 118% relative to zero nitrogen.
Verbatim
e0“Compared with the 0 kg N ha –1 treatment, the highest N application rate significantly increased the inflorescence number (118%), the seed number per inflorescence (65%), the 1000‐seed weight (9%), and the fall tiller density (121%)”
t0“Leymus chinensis”
Claim · model-written summary
The highest nitrogen rate increased seed number per inflorescence by 65% relative to zero nitrogen.
Verbatim
e0“Compared with the 0 kg N ha –1 treatment, the highest N application rate significantly increased the inflorescence number (118%), the seed number per inflorescence (65%), the 1000‐seed weight (9%), and the fall tiller density (121%)”
t0“Leymus chinensis”
Claim · model-written summary
The highest nitrogen rate increased 1000‐seed weight by 9% relative to zero nitrogen.
Verbatim
e0“Compared with the 0 kg N ha –1 treatment, the highest N application rate significantly increased the inflorescence number (118%), the seed number per inflorescence (65%), the 1000‐seed weight (9%), and the fall tiller density (121%)”
t0“Leymus chinensis”
Claim · model-written summary
The highest nitrogen rate increased fall tiller density by 121% relative to zero nitrogen.
Verbatim
e0“Compared with the 0 kg N ha –1 treatment, the highest N application rate significantly increased the inflorescence number (118%), the seed number per inflorescence (65%), the 1000‐seed weight (9%), and the fall tiller density (121%)”
t0“Leymus chinensis”
Claim · model-written summary
Inflorescence number was closely associated with fall tiller number and the reproductive-to-vegetative growth ratio.
Verbatim
e0“The increased inflorescence number was closely associated with the increased number of fall tillers and the ratio of reproductive growth to vegetative growth in these tillers.”
t0“Leymus chinensis”
Claim · model-written summary
All fall tillers could head the following year given sufficient precipitation.
- Taxon
- Leymus chinensisLeymus chinensist0
- Organ / stage
- fall tillerse0
- Outcome
- ability to head in the following yeare0
- Qualifier
- enough precipitation at the end of the growing season and during the wintere0
Not reportedDirection
Verbatim
e0“All fall tillers had the ability to head in the following year if there was enough precipitation at the end of the growing season and during the winter.”
t0“Leymus chinensis”
Claim · model-written summary
The authors suggest early fall nitrogen followed by late-season watering to improve seed yield.
- Taxon
- Leymus chinensisLeymus chinensist0
- Treatment
- first applying N during the early fall and then watering at the end of the growing seasone0
- Outcome
- seed yielde0
- Direction
- improvee0
Verbatim
e0“first applying N during the early fall and then watering at the end of the growing season will greatly improve the seed yield in L. chinensis”
t0“Leymus chinensis”
The same questions in other papers
nitrogen · yield · Leymus chinensisResults agree
13 papers in the same direction as this paper
- positive
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See all 14 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.