Investigation of some insects density in organic rice-duck farming

Biodiversity is one of the most important resources on earth, and human activitiesendanger the total number of hole wight species (Rahmann, 2011). Large numbersof those are already extinct or close to being erased. Over the last quarter of the 20thcentury, dramatic declines in both range and abundance of many species associatedwith farmland (Liu et al., 2011). The use of chemical pesticides used in agriculture inaddition water pollution resources reduce biodiversity (insects, plants, fungi, bacteria andanimals) and can cause illness in humans. Farming systems such as organic farming arenow seen by many as a potential solution to this continued loss of biodiversity (Bi et al.,2009). For example, rice-duck (organic farming) mutualism, as a indigenous knowledge,is one form of ecological engineering which makes use of the symbiotic relationshipbetween rice and ducks to more effectively utilize materials, reduce chemical fertilizerand pesticide inputs, increase product safety and overall productivity and decrease thepollutants discharged from rice-fields (Xi and Qin., 2009). The objective of this studywas compare insects density in organic rice-duck farming under field conditions innorthern of Iran.