RRDI_weed_damages සි த Address : Bathalagoda, Ibbagamuwa, Sri Lanka E- Mail : rrdi@doa.gov.lk Telephone : +94 372 258561 Fax : +94 372 259881 Facebook සිංහල தமிழ் Rice-the staple food-weed management Weeds Grow Aggressive than Rice ..... Compete "Underground" Underground parts of weeds spread in a wide area.runnersprostrate growth patternsetcFacilitate absorbance of more water and nutrients from surroundings. "Usurp" Resources Weed species are adapted to low resource conditions.Weeds can survive in such conditions.They also show efficient growth and developmentThis is an advantage against rice plats.This is an advantage against rice plats. Grow Rapidly Growth rate of weed species is higher than that of rice.Rapid development of aerial parts efficiently acquire sunlight.shades rice plants.hinder light aquisition by rice plants.develops microenvironments that facilitate pest lifecycles Compete "Underground" Underground parts of weeds spread in a wide area.runnersprostrate growth patternsetcFacilitate absorbance of more water and nutrients from surroundings. "Usurp" Resources Weed species are adapted to low resource conditions.Weeds can survive in such conditions.They also show efficient growth and developmentThis is an advantage against rice plats.This is an advantage against rice plats. Grow Rapidly Growth rate of weed species is higher than that of rice.Rapid development of aerial parts efficiently acquire sunlight.shades rice plants.hinder light aquisition by rice plants.develops microenvironments that facilitate pest lifecycles Flexible Weeds are biologically and ecologically flexible.Adapt easily to the changing environmental conditions.Can survive even under extreme environmental conditions. Gain and Sacrifice New rice varieties are developed with the aim of providing a better yield.might loose important traits that help them to compete with naturally evolving species.Weeds evolved with environmental pressure.can withstand and adapt to any condition. Biologically Strong Rapid seed germination.Rapid formation of mature seeds, vegetative propagules, or both.Prolific seed production.Seed characteristics that promote wide dispersal, such assmall sizeability to pass unharmed through animal digestive tractsburrs that attach to fur or clothingfeathery structures for wind dispersalSeed dormancy and longevity.Ability to regrow or reproduce from small fragments plant parts.High tolerance to stresses. Flexible Weeds are biologically and ecologically flexible.Adapt easily to the changing environmental conditions.Can survive even under extreme environmental conditions. Gain and Sacrifice New rice varieties are developed with the aim of providing a better yield.might loose important traits that help them to compete with naturally evolving species.Weeds evolved with environmental pressure.can withstand and adapt to any condition. Biologically Strong Rapid seed germination.Rapid formation of mature seeds, vegetative propagules, or both.Prolific seed production.Seed characteristics that promote wide dispersal, such assmall sizeability to pass unharmed through animal digestive tractsburrs that attach to fur or clothingfeathery structures for wind dispersalSeed dormancy and longevity.Ability to regrow or reproduce from small fragments plant parts.High tolerance to stresses.
