Full TGIF Record # 241606
Item 1 of 1
Publication Type:
Author(s):Kaerwer, Howard E. Jr.
Author Affiliation:Northrup, King & Co., Minneapolis, Minnesota
Title:Crabgrass seedling emergence near Minneapolis, Minnesota
Other records with the "Turf" Section
Meeting Info.:Chicago, Illinois: December 10-12, 1956
Source:Proceedings: Thirteenth Annual Meeting: North Central Weed Control Conference. 1956, p. 48.
# of Pages:1
Publishing Information:[Lincoln, Nebraska]: [North Central Weed Science Society]
Abstract/Contents:"Air temperatures recorded by the U. S. Weather Bureau at Minneapolis were converted to heat units using a base of 70°F. during 1954, 1955, and 1956. Each degree of the average mean temperature over 70°F. equals one heat unit. Heat units are cumulative. Soil and air temperatures at the Northrup-King Research Farm near Minneapolis were also converted to heat units in 1956, using a base of 70°F. The dates for the first emerged crabgrass plants were June 11th in 1954, June 4 in 1955, and June 9 in 1956. In each instance approximately 25 to 30 heat units had accumulated. The average accumulated soil temperature heat units were slightly greater than the air temperature heat units at the date of emergence in 1956. These results closely parallel W. H. Daniel's observations on crabgrass emergence in the Lafayette, Indiana, area. In each instance initial crabgrass emergence occurred following several days when air temperatures averaged in the 70°'s. In a laboratory study crabgrass emergence occurred in less than three days when a constant temperature of 75°F. was maintained. Approximately four days were necessary when a temperature of 72°F. was used."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Kaerwer, H. E. Jr. 1956. Crabgrass seedling emergence near Minneapolis, Minnesota. p. 48. In Proceedings: Thirteenth Annual Meeting: North Central Weed Control Conference. Chicago, Illinois: December 10-12, 1956. [Lincoln, Nebraska]: [North Central Weed Science Society].
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