NDLI: Weed emergence as influenced by soil moisture and air temperature

Content Provider	Springer Nature Link
Author	Calado, José M. G. Basch, Gottlieb Carvalho, Mário
Copyright Year	2008
Abstract	Emergence of weed seedlings depends on soil environmental conditions; mainly temperature and moisture, with the latter being fundamental and particularly important in environments which are characterised by irregular amounts and distribution of rainfall throughout the year. Thus, this study looks at the influence of soil moisture and air temperature on the emergence of weed seedlings. The experiment was carried out under controlled environmental conditions, using rings filled with samples of undisturbed topsoil (0–2.5 cm and 0–5 cm deep) of a Luvisol. There were four moisture levels that were maintained constant, with several repetitions (16–20). The results indicate that the maximum population density of weed plants was obtained with soil moisture near field capacity. With regard to the depth of the soil containing the seeds which contributed towards optimising population density, it was noted that the first 2–3 cm of undisturbed soil were critical for maximising the population. The emergence of seedlings was modelled using data from the 5 cm topsoil with soil moisture close to field capacity. This model indicates that a mean daily temperature sum of 446°C, which under Mediterranean autumn conditions represent a period of approximately one month, is needed, in order to obtain 80% of potential autumn-winter plant density, relative to the observed potential.
Starting Page	81
Ending Page	88
Page Count	8
File Format	PDF
ISSN	16124758
Journal	Journal of Pest Science
Volume Number	82
Issue Number	1
e-ISSN	16124766
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-10-15
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Emergence Population density Potential population Weeds Forestry Ecology Plant Sciences Plant Pathology Agriculture
Content Type	Text
Resource Type	Article
Subject	Ecology Plant Science Ecology, Evolution, Behavior and Systematics Insect Science Agronomy and Crop Science

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