Weed Dynamics in Acid Saline Pokkali Ecosystem of Kerala

Background: Pokkali is a versatile rice- fish system of cultivation, producing naturally organic rice along the waterlogged coastal regions Kerala. The weed flora fields different from other ecosystems. Diverse appears in low saline phase, when cultivated, but they dry up and decompose high phase. With time, significant deviations have been reported various climatic parameters as result, spectrum has also undergone changes. Methods: Two level stratified surveys anotomical studies were conducted during Kharif 2017 2018 to study five major growing blocks panchayaths (political village units) each block two padasekharams (group farming panchayath selected for surveying. To understand adaptive mechanism weeds soil condition, anatomical performed on individual species. Result: Cyperaceae family dominated ecosystem with more number Diplachne fusca Eleocharis dulcis weeds. Echinochloa crus-galli, dominant earlier survey was found confined very few locations frequency got reduced 80% 12.5%. In addition, Sphenoclea zeylanica observed an emerging notable morphological adaptations. Floating ferns like Najas graminea Hydrilla verticillata caused problems aeration water fields.