Claim · model-written summary
Young swards gave a higher yield during the first two years after sowing.
- Taxon
- Lolium perenne
Lolium perennee0 - Treatment
- Young swardse1
- Outcome
- yielde1
- Direction
- highere1
- Qualifier
- during the first two years after sowinge1
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sown swards of Lolium perenne L.”
e1“Young swards gave a higher yield during the first two years after sowing, but the advantage was lost in the period of ploughing and establishment, during which time the undisturbed swards achieved a small advantage in cumulative yield”
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 With rotational sheep grazing at 376 kg N/ha, Poa annua was the main invader.
- 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 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.