Allelopathic influence of sunflower [electronic resource]: II- allelopathic influence of chopped sunflower stems on wheat and two wheat weeds.

Includes references.

Pot experiments were conducted during 1998/99 and 1999/2000 seasons, at greenhouse of Agriculture Faculty, Tanta University, at Kafr ElSheikh, Egypt. Experiments were designed to determine the allelopathic influence of chopped-sunflower stems (mixed with clay soil at levels of 0, 2, 4, 6, 8 and I 0% w/w) on germination, growth, grain yield and its attributes of wheat as well as germination and growth of two wheat-weeds [canary grass (Phalaris minor, Retz.) and wild oats (Avena fatua, L.)J. Experimental design was a completely randomized with 12 replicates. The important findings could be summarized as follows: * Incorporating of chopped sunflower into pots soil above 8% (w/w) significantly affected the final germination percentage of wheat grains only in the 1st season, only as compared with control at 12 days from sowing. However, increasing the level of chopped-sunflower above 4% significantly decreased seed germination of the two weeds and delayed their initiation in both seasons. * Germination speed and mean germination time indices of wheat were significantly affected by increasing sunflower debris level above 6%, while those of the two weed species were significantly affected by increasing the level above 2%. * Dry weight (g/plant) of wheat wassignificantly decreased by increasing sunflower debris rate above 4%, while dry weight of canary grass and wild oats was gradually suppressed by increasing the debris rate above 2% as compared with control.

Summary in Arabic.

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