Received: 30-12-2014 / Accepted: 15-08-2015
The experiment was conducted to invetsigate the effect differentvermicompost levels on growth and yield of ĐTL2 rice variety grown in 2013 and 2014spring seasons atVietnam National University of Agriculture(5, 10, 15, and 20 tons/hain 2013 spring season and5,10, 15, 20and25 tons/hain 2014 spring season).The experiment was arranged in a randomized complete block design (RCBD) with three replications. No significant differencesin agronomic characteristicssuch as growth duration, number of leaves per main stem and effective number of tillers per hill were found withincreased levels of vermicompost dose. However, increasing levels of vermicompost exerted positive effect on physiological characteristics as SPAD index, leaf area and dry matter. Significant yield increase was observed at 10 tons per hectarebeyond which yield increment was insignificant. Highest net income (VND27,596,000per hectare)was obtained in 2014 cropping season with 10 tons vermicompost per hectare. The yield of ĐTL 2 rice variety depends onvermicompost dose expressed in thefollowingregression,y = -0.075x2+ 2.472x + 41.01 with R²= 0.522and optimal vermicompost dose was estimated at16,4 tons per hectare.