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Ein mathematisches Modell zur Vorhersage der Samenkeimung von Sorghum halepense (L.) Pers. bei verschiedenen Bodentemperaturen
Author(s) -
ARNOLD R. L. BENECH,
GHERSA C. M.,
SANCHEZ R. A.,
INSAUSTI P.
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.tb01691.x
Subject(s) - seedling , dormancy , sorghum , germination , environmental science , agronomy , breakage , canopy , soil science , atmospheric sciences , physics , biology , botany , materials science , composite material
Summary: A mathematical model to predict Sorghum hale‐pense seedling recruitment dynamics in relation to soil temperature was derived from the experimen‐tal results obtained in a previous investigation. The model is based on the assumption that soil temperature controls seedling recruitment of S. halepense by controlling release from dormancy and germination rate once dormancy breakage has been produced. The previous analysis sup‐plied mathematical functions to describe both the release from dormancy as controlled by tempera‐ture fluctuations, and the response to ‘thermal time’ after dormancy breakage. These relation‐ships were used in the construction of the model. This was tested against experimental field data with two differently aged seedbanks, in two seasons: spring and autumn. In each case in situ germination was monitored in plots with bare soil or soil surface shaded to simulate cover by a canopy. Soil temperature was recorded hourly and was used as an input of the model. A good description of seedling emergence dynamics in the field was obtained with the model, showing that seedling recruitment can be predicted using soil temperature data. The practi‐cal value of the developed model is discussed.