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Growth and Nitrate Assimilation in Oats as Influenced by Temperature 1
Author(s) -
Peterson David M.,
Schrader L. E.
Publication year - 1974
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1974.0011183x001400060025x
Subject(s) - panicle , cultivar , biology , avena , dry matter , agronomy , shoot , sowing , nitrate , poaceae , leaf blade , horticulture , ecology
The effects of several day/night temperature regimes on growth and nitrate assimilation of three cultivars of oat ( Avena sativa L.) plants from planting until panicle emergence were studied. Panicles emerged first in ‘Jaycee,’ then in ‘Portal,’ and last in ‘Froker’ at all temperatures. More tillers were formed at 13/13 C day/night temperatures than at warmer temperatures, except that Froker tillered most at 28/23 C. At cooler temperatures, Jaycee had more tillers than the other cultivars, and at warm temperatures, Froker had the most. Dry weights of culm plus leaf sheath fractions were similar for all cultivars, but dry weights of leaf blade fractions were greater for Froker than for Portal or Jaycee. This difference increased with increasing temperature. Reduced‐N (total‐N minus nitrate‐N) concentrations of vegetative parts at panicle emergence did not vary greatly with cultivar or with temperature, except at the high and low extremes. Reduced‐N concentrations of leaf blades were higher than those of culms and leaf sheaths. Froker exceeded the other cultivars in total reduced‐N per shoot, especially at warmer temperatures, largely because of greater leaf blade dry matter.