Development of Fertilizer Recommendation for Aquatic Taro (Colocasia esculenta) in Grey Terrace Soil

A field experiment was conducted to find out optimum doses of N, P, K and S for yield maximization of aquatic taro (Colocasia esculenta) during the summer seasons of 2008- 2009 and 2010-2011 in Grey Terrace Soil (poorly drained, grey, and silty) of Gazipur. There were four levels of nitrogen (0, 75, 100 and 125 kg ha-1), four levels of phosphorus (0, 30, 45 and 60 kg ha-1), four levels of potassium (0, 80, 100 and 120 kg ha-1) and four levels of sulphur (0, 10, 20 and 30 kg ha-1). The experiment was laid out in a randomized complete block design with three replications. The yield attributes and yield of aquatic taro were significantly increased by the application of NPKS fertilizers. The highest stolon yields (25.60 and 28.16 t ha-1 for 2008-09 and 2010-11, respectively) were found in N100P45K100S20 kg ha-1 combination. From the regression analysis, it could be concluded that around 110- 50-105-24 kg ha-1 N-P-K-S was the optimum dose for the production of aquatic taro in Grey Terrace Soil of Gazipur.