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The Effects of Temperature and Rainfall on Emergence and Growth of Eight Weeds

  • Emily S. Nussbaum (a1), Allen F. Wiese (a1), Donald E. Crutchfield (a1), Ellis W. Chenault (a1) and Dwane Lavake (a1)...

Abstract

From 1976 to 1981, emergence date, height, and dry weight per plant were taken for eight weed species grown at Bushland, TX, at two stand densities. Height and dry weight per plant were related to precipitation and degree-days for air and soil temperatures using base temperatures of 10, 15.5, or 21 C. Kochia [Kochia scoparia (L.) Schrad. ♯ KCHSC] emerged early in March and was followed by poison suckleya [Suckleya suckleyana (Torr.) Rydb. ♯ SUKSU], sunflower (Helianthus annuus L. ♯ HELAN), and common cocklebur (Xanthium pensylvanicum Wallr. ♯ XANPE) in early April. Buffalobu(Solanum rostratum Dunal. ♯ SOLCU), puncturevine (Tribulus terrestris L. ♯ TRBTE), lanceleaf sage (Salvia reflexa Hornem. ♯SALRE), and barnyardgrass (Echinochloa crus-galli L. Beauv. ♯ECHCG) emerged in late April. The weeds began to increase in height during May but plants did not start increasing in weight until June. Kochia, common cocklebur, and sunflower grew tallest, produced most dry matter, made most efficient use of water, and weighed most per plant. Heat unit accumulations were strongly correlated with plant height.

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Keywords

The Effects of Temperature and Rainfall on Emergence and Growth of Eight Weeds

  • Emily S. Nussbaum (a1), Allen F. Wiese (a1), Donald E. Crutchfield (a1), Ellis W. Chenault (a1) and Dwane Lavake (a1)...

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