Competition between maize and barnyard grass (Echinochloa crus-galli) at different moisture regime
1998
Martinkova, Z. | Honek, A. (Vyzkumny Ustav Rostlinne Vyroby, Prague-Ruzyne (Czech Republic))
Competition between a natural stand of barnyard grass Echinochloa crus-galli and a maize crop was studied during two years. The combined biomass of maize and barnyard grass increased with soil water availability. Maize shoot weight decreased with increase in root biomass of barnyard grass (which is a product of plant number per area and individual root weight) and decreasing soil water availability. Barnyard grass density was greatest when the water capacity of soils was low. Root weight and the proportion of dry matter allocated to roots (root to shoot ratio) was correlated with individual size of barnyard grass plants. Weight of barnyard grass plants decreased but root to shoot ratio increased with decreasing soil water availability. Root competition was the major factor decreasing maize weight while above ground competition was of minor importance.
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