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Responses of Some Kentucky Bluegrasses to High Temperature and Nitrogen Fertility 1
Author(s) -
Watschke T.L.,
Schmidt R. E.,
Blaser R. E.
Publication year - 1970
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/cropsci1970.0011183x001000040017x
Subject(s) - biology , nitrogen , respiration , poa pratensis , adaptation (eye) , botany , environmental factor , poaceae , zoology , horticulture , chemistry , organic chemistry , neuroscience
Five Kentucky bluegrasses ( Poa pratensis L.) were grown at three temperature regimes: 18 C light and 10 C dark; 27 C light and 18 C dark; 35 C light and 20 C dark; and two N rates (15 and 150 ppm N) in solution culture. High temperature increased respiration rates; consequently, plants with high carbohydrates best supported growth at high temperatures. Bluegrasses originating in warm regions appeared more tolerant of high temperatures because of higher carbohydrate levels, lower NO 3 ‐N absorption, and lower foliar NO 3 ‐N than those from cooler regions. Preconditioning at cool temperatures enhanced tolerance of all grasses to high temperatures. Management of grasses can also influence tolerance to high temperatures; however, genetic adaptation is of most importance for survival at high temperatures.