Mills, AnnamariaSmith, MalcolmMoot, Derrick2018-03-262016-01-012016Mills, A.M., Smith, M.C., & Moot, D.J. (2016). Relationships between dry matter yield and height of rotationally grazed dryland lucerne. Journal of New Zealand Grasslands, 78, 185-196. Available from https://www.grassland.org.nz/publications/nzgrassland_publication_2832.pdf2463-2872https://hdl.handle.net/10182/9195Between 2009/2010 and 2014/2015 a total of 711 destructive paired samples of total dry matter yield (kg DM/ha) and lucerne height were taken from a grazed dryland lucerne monoculture experiment at Ashley Dene, Canterbury, New Zealand. These were used to develop relationships suitable for on-farm estimates of lucerne. For pre-graze yields, the variation accounted for increased from 59%, based on lucerne height alone, to 84% for the 14 Year/Season combinations. For postgrazing residual DM yields, inclusion of Year as a factor increased the R2 from 0.39 to 0.65. Pre-graze data were also grouped into spring, summer and autumn. These relationships accounted for 54-60% of the observed variation in dryland lucerne. In spring the multiplier was ~95 kg DM/cm and this dropped to ~75 kg DM/cm for heights measured in the summer. In autumn the multiplier was ~55 kg DM/cm. Lack of stability in the relationships over time could reflect environmental conditions and changes in stand density which height measurements alone cannot account for.pp.185-196enCopyright © The author(s) and NZGA.alfalfadry matter yield estimatesheightMedicago sativa L.regression analysisJournal Article10.33584/jnzg.2016.78.504ANZSRC::0703 Crop and Pasture ProductionANZSRC::070302 Agronomy2463-2880