摘要：Fluctuation of population density of the earthworm Drawida willsi (Michaelsen) in relation to some climaticand edaphic factors was assessed from a tropical cropland agroecosystem site at Ranchi for a period ofeighteen months. The total density ranged between 75 ± 25.49 (April 2010) to 2115 ± 189.87 m -2 (August2010). Of the various factors studied rainfall, relative humidity, soil moisture, organic carbon and nitrogencontent of the soil showed a significant positive correlation with the total earthworm density. Moisture contentof the soil was considered to be the most important single factor responsible for the population fluctuation ofthe earthworm.
