Do Crop Rotations in Rice Reduce Weed and Echinochloa spp. Infestations? Recommendations for Integrated Weed Control

The species belonging to the genus Echinochloa represent main weeds in rice fields worldwide. Heavy soils are especially appropriate for this crop that is often grown monoculture. A drought period 2012 impeded farmers from sowing some parts of region Aragon (northeastern Spain) and, unusually, they seeded alternative crops such as winter cereal, fescue (Festuca arundinacea), ryegrass (Lolium multiflorum) and lucerne (Medicago sativa). total 20 were selected, which had been monocrop until 2011 several sequences established afterwards; weed vegetation was recorded spring, summer autumn 2014-16 find out if rotations reduced infestations. Winter cereal with highest soil cover; difficulties installation probably due heavy textures. spp. plants found stubble after having previous two years before that; forage fields, small earing adapted mowing detected. Recommendations Integrated Weed Management arise observations ploughing seed shed emerged plants, assuring a high density crops, efficient herbicide control fields.