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THE EFFECT OF THE GRAZING ANIMAL ON THE N STATUS OF GRASS SWARDS
Author(s) -
Brockman J. S.,
Rope C. M.,
Stevens M. T.
Publication year - 1971
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.1365-2494.1971.tb00666.x
Subject(s) - fertilizer , grazing , agronomy , yield (engineering) , environmental science , soil water , mathematics , zoology , biology , soil science , materials science , metallurgy
Thirty‐one sets of N yield data were considered, taken from seven experiments grazed by sheep. N yield could be explained in terms of fertilizer N rate, an estimate of soil N and an interaction between the two. Fertilizer N increased grass N yield more on grazed swards than on cut swards, and this effect was greatest on soils with high available soil‐N. It is concluded that N recircula‐tion can be substantial on heavily‐stocked swards receiving high rates of fertilizer N, so increasing the efficiency of fertilizer as a source of N in these conditions.