Abstract
Rhizomes of quackgrass [Agropyron repens(L.) Beauv.] and johnsongrass [Sorghum halepense(L.) Pers.] were buried at various depths in the soil in the fall of 1972 and 1973, then removed at different times for viability tests. Quackgrass rhizomes retained viability at 2 cm where the coldest temperatures were −17 C. Johnsongrass rhizomes survived the winter at depths of 20 cm or more, and were killed at temperatures below about −9 C. Quackgrass rhizomes had a higher concentration of lipids and higher proportions of unsaturated fatty acids than did johnsongrass rhizomes. This difference may contribute to the superior cold tolerance of the quackgrass rhizomes.
Publisher
Cambridge University Press (CUP)
Subject
Plant Science,Agronomy and Crop Science
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