Laboratory bioassay was conducted to assess the effects of wheat (Triticumaestivum) crop density on weed control of annual ryegrass (Lolium rigidum).Increasing the density of allelopathic wheat strongly ameliorated its competitiveness and significantly inhibited the growth of annual ryegrass. The increased wheat density steadily decreased the total root length and total root surface area of ryegrass, however,the root diameter of ryegrass increased. The roots of annual ryegrass were thinner than wheat. Interactions between the wheat and annual ryegrass greatly influenced the annual ryegrass root length and diameter within 0.180-0.225 mm and within 0.225-0.270 mm. In addition, root distribution and dominance in different diameter class waswheat density dependent and uneven. The increased root diameter and decreased rootlength and surface area of rye grass may be due to strong allelopathic effects of wheat(significant quantity of allelochemicals were produced at middle and high densities).This might led to the suppression of annual ryegrass growth.
|Number of pages||12|
|Publication status||Published - Jan 2011|