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Lincoln University (2013)

Grazing management and pasture production of tall fescue-legume mixtures in dryland pastures

Jusoh, Shokri

Titre : Grazing management and pasture production of tall fescue-legume mixtures in dryland pastures

Auteur : Jusoh, Shokri

Université de soutenance : Lincoln University

Grade : Doctor of Philosophy (PhD) 2013

Résumé partiel
Pasture production and composition and liveweight gain of sheep grazing tall fescue-clover and perennial ryegrass-clover dryland pastures at Lincoln, Canterbury was examined in four experiments from May 2008 to December 2010. Four objectives were identified to (i) quantify the pasture production, growth, persistence, composition, (ii) pasture nutritive value and liveweight gain of sheep grazed cultivars of tall fescue, white, strawberry and subterranean clover at high and low P and S fertility, to determine the (iii) effect of time of grazing in autumn on subterranean clover growth was determined, and (iv) effect of spring defoliation management on tall fescue cultivars and perennial ryegrass pastures grown with white and strawberry clover. Experiment 1 examined the interactive effects of tall fescue cultivar (Continental, cultivar Advance, versus Mediterranean, cultivar Flecha), sown clover species (subterranean clover versus a combination of white and strawberry clover) and soil fertility (high P and S fertilizer versus low fertilizer P and S) on annual and seasonal DM production, botanical composition, plant density and morphology. Annual DM production was greater in Advance (7790 kg DM/ha) than Flecha (6871 kg DM/ha) in year 1 and Flecha (8367 kg DM/ha) than CA (7547 kg DM/ha) in year 2. Annual DM production of the legume component was greater in subterranean clover pastures than perennial clover pastures in both year 1 (945kg DM/ha v 539 kg DM/ha) and year 2 (1457kg DM/ha v 1042 kg DM/ha). Survival of strawberry clover in perennial clover pastures was poor with a low percentage (< 1 % DM) in pasture after 2 years. The percentage of clover in pastures was generally greater in Flecha than Advance. Annual DM production was greater at high than low fertility in both year 1 (8734kg DM/ha v 7828 kg DM/ha) and year 2 (7134 kg DM/ha v 6834 kg DM/ha). This primarily reflected greater grass growth at high fertility as legume growth was unaffected by soil fertility. Experiment 2 examined the interactive effects of tall fescue cultivar (Advance versus Flecha) and soil fertility (high P and S fertilizer versus low fertilizer P and S) on pasture nutritive value and liveweight gain of ewes and lambs in spring and ewe hoggets in autumn.

Mots clés : tall fescue ; white clover ; strawberry clover ; subterranean clover ; grazing ; Trifolium repens ; Trifolium subterraneum ; Trifolium fragiferum ; Lolium perenne ; Festuca arundinacea ; Schedorus phoenix ; seeding population ; DM production ; LWG ; 0703 - Crop and Pasture Production ; 070204 - Animal Nutrition

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Page publiée le 18 juin 2013, mise à jour le 7 août 2017