caa a22 4500 47711136X CHVBK 20180405111610.0 cr unu---uuuuu 170330e19960201xx s 000 0 eng 10.1007/BF00009334 doi (NATIONALLICENCE)springer-10.1007/BF00009334 Effect of white clover cultivar on apparent transfer of nitrogen from clover to grass and estimation of relative turnover rates of nitrogen in roots [Elektronische Daten] [A. Laidlaw, P. Christie, H. Lee] The apparent transfer of N from clover to associated grass was evaluated over a four year period both on the basis of harvested herbage and by taking account of changes in N in stubble and root (to 10 cm depth) in swards with perennial ryegrass and three different white clover cultivars differing in leaf size. The large leaved Aran transferred 15% of its nitrogen while Huia transferred 24% and the small leaved Kent Wild White transferred 34%. When changes in stubble and root N were taken into account the percentage of N transferred was calculated to be 5% less than in harvested herbage only, as the small leaved types had proportionately more N in the roots and stolons, but the large leaved type was probably more competitive towards the grass. Loss of N from clover roots from July to October was compared to that from grass roots in a grass/white clover sward continuously stocked with steers using a method which incorporated tissue turnover and 15N dilution techniques. Less than 1 mg N m-2 d-1 was lost from the grass roots. In contrast 8 mg m-2 d-1 were estimated to be lost from clover roots while 12 mg N m-2 d-1 were assimilated. It is concluded that clover cultivar and competitive ability on grass have to be taken into account together with the relationship between N turnover in roots and N available for grass growth when modelling N transfer in grass/clover associations. Kluwer Academic Publishers, 1996 Lolium perenne L nationallicence 15N dilution nationallicence nitrogen transfer nationallicence roots Trifolium repens L nationallicence Laidlaw A. Department of Applied Plant Science, Plant Testing Station, Queen's University of Belfast, 50 Houston Road, Crossnacreevy, BT6 9SH, Belfast, UK aut Christie P. Department of Agricultural and Environmental Science, The Queen's University of Belfast, Newforge Lane, BT9 5PX, Belfast, UK aut Lee H. Department of Applied Plant Science, Plant Testing Station, Queen's University of Belfast, 50 Houston Road, Crossnacreevy, BT6 9SH, Belfast, UK aut Plant and Soil Kluwer Academic Publishers 179/2(1996-02-01), 243-253 0032-079X 179:2<243 1996 179 11104 https://doi.org/10.1007/BF00009334 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00009334 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Laidlaw A. Department of Applied Plant Science, Plant Testing Station, Queen's University of Belfast, 50 Houston Road, Crossnacreevy, BT6 9SH, Belfast, UK aut NATIONALLICENCE 700 1- Christie P. Department of Agricultural and Environmental Science, The Queen's University of Belfast, Newforge Lane, BT9 5PX, Belfast, UK aut NATIONALLICENCE 700 1- Lee H. Department of Applied Plant Science, Plant Testing Station, Queen's University of Belfast, 50 Houston Road, Crossnacreevy, BT6 9SH, Belfast, UK aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers 179/2(1996-02-01), 243-253 0032-079X 179:2<243 1996 179 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer