Abstract:
Allelopathic effects of aqueous whole plant leachates of dominant weed (Cyperus difformis and Echinochloa crusgalli) and non dominant weed (Paspalum paspaloides and Sagittaria trifolia) were examined by foliar application on biochemical and physiological growth and yield parameters of paddy rice (Tarom variety) of northern Iran. Spraying aqueous whole plants leachates (5%) showed that the content of phenols in flag leaf of treated crop was significantly increased by whole leachates of Cyperus difformis and Echinochloa crusgalli at P=0.05 by ANOVA. The content of total chlorophyll in flag leaf of treated crop was significantly decreased by whole leachates of Cyperus difformis and Sagittaria trifolia. This study also showed that whole plant leachates of selected weeds did not show much inhibitory effect on growth parameters (number of total tillers pot-1, plant height and elongation of flag leaf). On the contrary, elongation of panicle and total grain fill panicle-1 were inhibited by foliar application of whole selected weeds. In case of number of effective tillers pot-1, Cyperus difformis along with Sagittaria trifolia significantly hampered the number of effective tillers pot-1 only; while 1000 grain weight and the number of grain panicle-1 were not affected by whole leachates of all treatments. However, whole plant leachates of Cyperus difformis and Sagittaria trifolia strongly hampered grain yield of Tarom variety as compared with control by 30.4 and 29.6%, respectively.
Page(s):
123-129
DOI:
DOI not available
Published:
Journal: Pakistan Journal of Weed Science Research, Volume: 15, Issue: 2--3, Year: 2009