Influence of Planting Date and Microsite on Weed Dynamics in Sugarcane in Sri Lanka

Experiments were conducted in Sri Lanka to compare weed seedling emergence in three sugarcane plots of 0.1 ha planted in October 1995, January 1996, and April 1996. In each plot, weed seedling emergence was monitored for 20 wk in five permanent quadrats on each of three microsites: on ridges, in fur...

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Bibliographic Details
Published in:Weed science 2007-01, Vol.55 (1), p.23-29
Main Authors: Witharama, W. R. G, Naylor, Robert E. L, Whytock, G. P
Format: Article
Language:English
Subjects:
Ageratum conyzoides
Agronomy. Soil science and plant productions
Biological and medical sciences
buried seeds
crop-weed competition
Dactyloctenium aegyptium
Emergence
fallow
Fallowing
field experimentation
Fundamental and applied biological sciences. Psychology
hydrothermal time
Isachne
Isachne globosa
Millet
Panicum maximum
Parasitic plants. Weeds
Physical properties
Physics, chemistry, biochemistry and biology of agricultural and forest soils
Phytopathology. Animal pests. Plant and forest protection
Planting
planting date
Principal components analysis
Rain
rainfall
Seedling emergence
Seedlings
soil moisture
soil physical properties
Soil science
soil water
Sugar cane
sugarcane
Swamps
temperature
tillage
Water and solute dynamics
WEED BIOLOGY AND ECOLOGY
Weeds
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Summary:Experiments were conducted in Sri Lanka to compare weed seedling emergence in three sugarcane plots of 0.1 ha planted in October 1995, January 1996, and April 1996. In each plot, weed seedling emergence was monitored for 20 wk in five permanent quadrats on each of three microsites: on ridges, in furrows, and on adjacent fallow land. Soil moisture (0 to 5 cm) and soil temperature (at 2.5 cm) were also recorded. Only crowfootgrass, swamp millet, and guineagrass (all grasses) occurred in all nine planting time-by-microsite combinations. About half of all seedlings emerging over the three planting times were swamp millet, and the next most frequent species was tropic ageratum. The composition of the emerged flora was similar on ridges and in furrows, but more seedlings emerged in the furrows than on the ridges. The highest number of emerged seedlings and of species occurred on adjacent fallow land. The major factor influencing seedling emergence appeared to be soil moisture.
ISSN:0043-1745
1550-2759
DOI:10.1614/WS-05-110.1