Harvest management based on leaf stage of a tetraploid vs. a diploid cultivar of annual ryegrass
| Autor: | Juan K. Q. Solomon, David J. Lang, Bisoondat Macoon |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
biology Tiller (botany) Forage 04 agricultural and veterinary sciences Lolium multiflorum Management Monitoring Policy and Law biology.organism_classification 01 natural sciences Productivity (ecology) Agronomy Loam 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Stage (hydrology) Cultivar Ploidy Agronomy and Crop Science 010606 plant biology & botany |
| Zdroj: | Grass and Forage Science. 72:743-756 |
| ISSN: | 1365-2494 0142-5242 |
| Popis: | Leaf stage-dependent defoliation is linked to the plant's physiological status and may be a more suitable criterion than time-based intervals for harvesting forage grasses, but no reports of research with annual ryegrass (Lolium multiflorum Lam. var. westerwoldicum) were found. To address this, a 2-year field study was carried out at Raymond, MS, on a Loring silt loam soil (fine-silty, mixed, thermic Typic Fragiudalfs). Forage production, morphological characteristics and nutritive value responses to defoliation based on leaf stage (2, 3 and 4 leaves per tiller) and two residual stubble heights (RSH; 5 and 10 cm) of a tetraploid (“Maximus”) vs. a diploid (“Marshall”) cultivar of annual ryegrass were quantified. Forage harvested, in 2011, increased linearly as leaf stage increased from 7.3 to 8.8 Mg/ha, but during 2012 was least (7.0 Mg/ha) at 3-leaf stage and similar at the other two leaf stages (7.6 Mg/ha). Tiller density was less for Maximus (1,191 tillers/m2) than for Marshall (1,383 tillers/m2). Leaf blade proportion decreased with increasing leaf stage and was greater by 9% for Maximus than for Marshall. Generally, forage nutritive value became less desirable with increasing leaf stage. There was a dichotomy in forage harvested and nutritive value responses, but maximum forage productivity was achieved when annual ryegrass was defoliated at the 4-leaf stage interval. |
| Databáze: | OpenAIRE |
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