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Alarming tracks!


, : Alarming tracks!. Weibulls Gras tips 18: 11-14

Considerable damage was done to a football pitch when snow was removed by a tractor-mounted shovel at a time when the soil and grass were frozen. The track marks of the machine persisted for many weeks. The turf was shorn to a 2- to 3- mm high stubble; mechanical damage to the grass also occurred from the ice crystals in the tissues and was followed by fungal infection.

US$29.90


Other references

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Davies, P.E.; Sloane, R.D., 1987: Characteristics of the spawning migrations of brown trout salmo trutta l. and rainbow trout salmo gairdneri richardson in great lake tasmania australia. Upstream spawning migrations of mature brown trout, Salmo trutta, and rainbow trout, S. gairdneri, were studied in Liawenee Canal, Great Lake from 1949 to 1985. Brown trout migrations normally occurred from early April to mid-May and rainbow trout...

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Mercier, Jean, 1946: Remarques a propos dEchinides representants du genre Diplocidaris Desor. Diplocidaris. with crenu-lated tubercles, leads to a var. with smooth tubercles. There are similar examples in many genera, e, g., Paracidaris. P. florigemma is distinct from Alpicidaris cureti because of the existence of crenulations on the tuber...

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Schwartz S.H., 1992: Universals in the content and structure of values theoretical advances and empirical tests in 20 countries. Zanna, M P (Ed ) Advances in Experimental Social Psychology, Vol 25 Ix+394p Academic Press, Inc : San Diego, California, Usa; London, England, Uk Illus 1-65

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