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THE EFFECT OF NITROGEN FERTILIZER AND CLIPPING FREQUENCY UPON THE YIELD AND IN VITRO DIGESTIBILITY OF INTERMEDIATE WHEATGRASS
Author(s) -
Ashford R.,
Troelsen J. E.
Publication year - 1965
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.1365-2494.1965.tb00409.x
Subject(s) - clipping (morphology) , dry matter , fertilizer , nitrogen , agronomy , zoology , yield (engineering) , nitrogen fertilizer , mathematics , chemistry , biology , materials science , philosophy , linguistics , organic chemistry , metallurgy
The effect of rate of nitrogen fertilizer and clipping frequency on total production of dry matter (DM), in vitro digestible organic matter (DOM), and crude protein (CP) was investigated in the first harvest year of intermediate wheatgrass. The highest yields of DM and DOM, but not of CP, were obtained at the longest clipping intervals and at the higher rates of fertilizer application. Fertilizer failed to give satisfactory increases in yield even at very high rates of application when a 2‐week clipping interval was used. The interaction between clipping frequency and fertilizer rate had a highly significant effect on yields of both DM and DOM. A sharp decline in percentage DOM that occurred with increasing length between clippings was offset to some degree by application of N fertilizer. A similar assessment of treatments was obtained from DOM and DM yield data when the grass was fertilized with N, but not when N was deficient. The CP data gave a different assessment of treatments from that obtained from either DOM or DM data.