Prediction of reproductive initiation from relative ear emergence timing in Lolium perenne L.varieties
During May to June perennial ryegrass varieties predominately comprise of reproductively developing tillers in which the digestibility of the stem falls much faster than the leaf, with associated water‐soluble carbohydrate and protein losses ( Terry and Tilley,1964).Even when at similar digestibilities, leaf has a 20％ higher voluntary DM intake than stem, (Laredo and Minson 1975 ) and so stemmy compositions limit animal intake.Spring defoliation timing is known to interact with the degree of reproductive development to affect stem content in a sward ( Holmes & Hoogendoorn, 1983 ).Using defoliation timing to control stem content has not, however, been wholly effective in practice, partly because the degree of reproductive development can.t be easily assessed prior to visible stem elongation.This study examined the relationship between the timing of reproductive initiation and ear emergence in eight perennial ryegrass varieties and determined the effect of latitude and meteorological conditions on the timing of these growth stages.
ryegrass reproduction initiation heading
G.Hurley M.O Donovan T.J.Gilliland
Dairy Production Research Centre,Teagasc Moorep ark,Fermoy,Co.Cork,Ireland;School of Biological Scie Dairy Production Research Centre,Teagasc Moorep ark,Fermoy,Co.Cork,Ireland School of Biological Sciences,Queens University Bel fast,Northern Ireland;Agri-Food & Biosciences In
国际会议
呼和浩特
英文
2008-06-29（万方平台首次上网日期，不代表论文的发表时间）