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Die Anwendung eines Temperatur‐Zeit‐Modells zurVerbesserung der Effektivitätvon Herbizidan‐wendungen bei Sorghum halepense (L.) Pers
Author(s) -
GHERSA C. M.,
SATORRE E. H.,
ESSO M. L.,
PATARO A.,
ELIZAGARAY R.
Publication year - 1990
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.1365-3180.1990.tb01699.x
Subject(s) - rhizome , sorghum , biomass (ecology) , population , degree (music) , agronomy , biology , horticulture , botany , environmental science , mathematics , physics , demography , sociology , acoustics
Summary: The dynamics of sprout emergence and rhizome populations of Sorghum halepense (L.) Pers. were followed in two field experiments. In addition, the herbicide dalapon was applied at various stages during rhizome development and the degree of control was evaluated. Rhizome biomass oscillated during the growth cycle, whereas the number of rhizome sprouts increased asymptotically until mid‐summer. Observed values were compared against those predicted from a thermal calendar model. The dynamics of the rhizome population was predicted accurately in both experiments, but only in one of them was the prediction of the sprout emergence satisfactory. The degree of control differed markedly between herbicide applications at various intervals during population development. Best results were obtained from applications when rhizome biomass was at a minimum. The time of minimum biomass was predicted by a thermal calendar model. The advantages of using the thermal calendar model to determine the time of herbicide application, and the possible influence of the distribution of the rhizome population in the soil profile on the predictions of the model, are discussed.