Claim · model-written summary
With rotational sheep grazing at 376 kg N/ha, Poa annua was the main invader.
- Taxon
- Lolium perenne
Lolium perennee0 - Outcome
- the main invadere3
- Qualifier
- With rotational sheep grazing, at 376 kg N/hae3
Poa annuaNot reportedMaterialGeneCompoundOrgan / stageSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sown swards of Lolium perenne L.”
e3“With rotational sheep grazing, at 376 kg N/ha, the main invader was Poa annua L., although the proportion was low and L. perenne remained the dominant species”
Title
Influence of age and year of growth on the botanical composition and productivity of swards
A. Smith; P. J. Allcock The Journal of Agricultural Science 1985. doi:10.1017/s0021859600056379
Other claims from this paper (19)
- Intervention effect Infrequent cutting with 188 kg N/ha per year allowed a substantial invasion by Agrostis spp. in Lolium perenne swards.
- Observation At 376 kg N/ha under cutting, Agropyron repens was the main invader of Lolium perenne swards.
- Observation At 376 kg N/ha under cutting, Agrostis had a lower proportion in Lolium perenne swards.
- Observation Lolium perenne remained the dominant species under rotational sheep grazing at 376 kg N/ha.
- Observation After cutting at 752 kg N/ha, the swards became dominated by A. repens.
- Association Plant successions with sward age had no influence on the yield or quality of herbage under grazing or cutting.
- Association Year-to-year variation in total dry matter yield was much greater than variation attributable to sward age.
- Association Year variation exceeded age variation in dry matter yield at any one season.
- Association In the most extreme comparison, dry matter yield at one defoliation in one year was 2.8 times the lowest yield at the same season in another year.
- Association Yield at the same season varied by up to 1.5-fold between swards of different ages.
- Association The percentage of digestible organic matter declined with sward age at the first cut at the lowest N level.
- Association Herbage nitrogen concentration increased with sward age at the first cut at the lowest N level, and did not change at higher N levels.
- Association Annual yield of digestible organic matter declined significantly with age at the highest N level.
- Association Annual yield of herbage N did not change significantly with age.
- Intervention effect Young swards gave a higher yield during the first two years after sowing.
- Intervention effect Undisturbed swards gained a small cumulative yield advantage over young swards during ploughing and establishment.
- Association Cumulative DOM and N yields of young swards were not sufficiently different from older swards to suggest an advantage from regular resowing.
- Intervention effect In a theoretical analysis, ploughing and resowing gave little or no advantage in productivity over swards not renovated before age 7.
- Intervention effect In a theoretical analysis, resowing too frequently gave a loss of yield.