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- Title
Rhizome depth: the critical factor in winter survival of Sorghum halepense (L.) Pers. (Johnson grass).
- Authors
Warwick, S. I.; Phillips, D.; Andrews, C.
- Abstract
Two biotypes of <em>Sorghum halepense</em> (L.) Pers., (Johnson grass) one which overwinters and one which does not overwinter from rhizomes at the northern limit of their North American ranges, were compared for rhizome production, rhizome survival and physiological tolerance to cold. The two biotypes differed in both the amount and depth of rhizome production under field conditions, with the non-overwintering biotype producing very few rhizomes 20 cm below the soil surface. Rhizome survival was clearly related to depth of burial for both biotypes. Survival was much reduced in the top 20 cm of soil and increased at greater depths to nearly 100% survival at depths of 40 to 50 cm. Differences in rhizome survival were apparent between the two biotypes and under the two climatic conditions tested, with greatly reduced survival of the overwintering biotype in the more extreme northern field plot. Similar levels of cold hardiness were observed in both hardened seedlings and rhizomes of the two biotypes. These levels were low and, in general, would not provide major protection against freezing temperatures.
- Subjects
SORGHUM; JOHNSON grass; SEEDLINGS; FORAGE plants; TEMPERATURE
- Publication
Weed Research, 1986, Vol 26, Issue 6, p381
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1986.tb00721.x