Premium
Nitrogen studies in Lolium perenne grown for seed I. Level of application
Author(s) -
HEBBLETHWAITE P. D.,
IVINS J. D.
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.tb01434.x
Subject(s) - lolium perenne , perennial plant , agronomy , nitrogen , yield (engineering) , biology , crop , livestock , zoology , chemistry , physics , ecology , organic chemistry , thermodynamics
In field trials in 1971–73, perennial ryegrass cv. S23 and S24 were given up to 200 kg ha −1 nitrogen (N) and dry weight, seed yields and seed yield components measured. Optimum levels of applied N ranged from 80 kg ha −1 , where livestock had grazed the crop in the establishment year or where residual N levels were about 70 kg ha −1 , to 120 kg ha −1 where residual N was low. Application of more than 120 kg ha −1 did not increase yields further because of increased lodging and increased production of vegetative tillers. Seed set was 37–55% in S24 and 25–29% in S23 and was decreased by lodging.