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Anwendung eines Temperatursummen‐Modells auf Bestandsdynamik und Bekämpfung von Sorghum halepense (L.) Pers
Author(s) -
VITTA J. I.,
LEGUIZAMÓN E. S.
Publication year - 1991
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1991.tb01745.x
Subject(s) - rhizome , tiller (botany) , sorghum , agronomy , crop , biomass (ecology) , mathematics , weed , population , shoot , field experiment , biology , yield (engineering) , horticulture , botany , physics , sociology , thermodynamics , demography
Summary: The dynamics of Sorghum halepense tiller emergence and rhizome biomass were studied in field experiments. The effect of different application dates of a post‐emergence herbicide on crop yield was measured. The relationship between accumulated thermal units (A.T.U.) and the percentage of emerged tillers in soybean was described by a single non‐linear regression model, independent of initial bud density. The estimates of population density were generally higher than those predicted by the original model developed by Satorre, Ghersa & Pataro (1985). In the absence of a crop, the higher the density of the weed the more concentrated the tiller emergence in the early part of the tillering period. The rhizome biomass reached a minimum value at about 230°C days, and was independent of the initial weed density. The maximum herbicide efficiency was achieved when the application was performed closest to the period of minimum rhizome biomass. The results show the feasibility of optimizing S. halepense control by calculating the period f minimum rhizome biomass. Such a criterion ls consistent with the maximization of crop yields.