Impact of pasture height and herbage mass on suppression of variegated thistle in North Island East Coast hill country
| Autor: | R.M. Greenfield, Emma Noakes, Ants H.C. Roberts, C. A. Cameron, Tim Rhodes, Renee Grigson, Sue M. Zydenbos, K. N. Tozer |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
East coast food.ingredient geography.geographical_feature_category Soil Science 04 agricultural and veterinary sciences Plant Science 01 natural sciences Pasture food Geography Agronomy 040103 agronomy & agriculture Thistle 0401 agriculture forestry and fisheries Agronomy and Crop Science Ecology Evolution Behavior and Systematics 010606 plant biology & botany Nature and Landscape Conservation |
| Zdroj: | Journal of New Zealand Grasslands. 82:83-90 |
| ISSN: | 2463-2880 2463-2872 |
| Popis: | Variegated thistle in East Coast North Island hill country reduces pasture and livestock productivity. To quantify the impact of increasing amounts of pasture cover (herbage mass) on this weed, variegated thistle seeds were hand-sown in autumn into pasture swards that ranged in height from 0 cm (bare ground) to 12 cm, on an East Coast property near Gisborne. Sward height was maintained by mowing without damaging the thistle plants. Increasing pasture cover reduced thistle emergence, height, diameter, biomass, survival, and seed production. By early June, 7 weeks after sowing, thistle emergence was greatest from bare ground and from maintaining a pasture at a height of 3 cm (>1100 kg DM ha-1 in autumn) and declined with increasing pasture height. By December, thistle height, diameter, biomass, flowerhead production and survival were highest in the bare ground treatment (thistle biomass ≈760 g plant-1), much lower in the 3-cm pasture height treatment (≈20 g plant-1), negligible in the 6-cm (>1600 kg DM/ha) and nil in the 8-cm (>1800 kg DM ha-1) and 12-cm (>2700 kg DM ha-1) pasture treatments (P |
| Databáze: | OpenAIRE |
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