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EFFECTS OF TWO LEVELS OF APPLIED NITROGEN ON THE GROWTH OF S37 COCKSFOOT IN SMALL SIMULATED SWARDS IN A CONTROLLED ENVIRONMENT
Author(s) -
Ryle G. J. A.
Publication year - 1970
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.1365-2494.1970.tb00601.x
Subject(s) - shoot , dry weight , nitrogen , zoology , horticulture , biology , botany , agronomy , chemistry , organic chemistry
Two contrasting levels of N were applied in natrient solution to dense stands of cocksfoot plants grown in tins in controlled‐environment cabinets. During a 12‐week period of growth in a constant environment a full growth analysis was carried out. High N caused a three‐ or four‐fold increase in total dry weight per unit area by doubling shoot number and increasing shoot weight by approximately 60%. The increase in shoot weight arose mainly from a large Increase in leaf and sheath weight per shoot; root weight per shoot was for the most part negatively affected by high N. The large positive effect of N on leaf weight resulted from the development of slightly wider and much longer leaves, which had a similar or greater weight per unit area of leaf than equivalent leaves from the low‐N treatment. The effect of high N on total dry weight was the consequence of a superior NAR and, in the first half of the experiment, a superior LAR. The physiological implications of the effects of high levels of applied N on DM production in the field are discussed. ice and analyses.