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Nitrogen fixation by white clover in hill pasture
Author(s) -
HAYSTEAD A.,
LOWE A. G.
Publication year - 1977
Publication title -
grass and forage science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.716
H-Index - 56
eISSN - 1365-2494
pISSN - 0142-5242
DOI - 10.1111/j.1365-2494.1977.tb01414.x
Subject(s) - pasture , nitrogen fixation , perennial plant , agronomy , nitrogen , trifolium repens , biology , ammonium , chemistry , zoology , organic chemistry
An experiment is described in which the amount of nitrogen fixed by the white clover component of a surface‐sown hill sward was determined using small quantities of 15 N‐labelled ammonium sulphate. Between 11 July and 22 August 1974 25 kg ha −1 N was fixed. No evidence of a transfer of N from clover to the associated perennial ryegrass was detectable over this period although the N content of the grass growing with the clover was higher. The relative advantages of the isotope technique and the acetylene reduction assay are discussed.