ASSESSING THE RESIDUAL EFFECT OF ORGANIC MANURE AND FERTILIZER MANAGEMENT IN T. AMAN RICE

Abstract

A pot experiment was conducted at the net house of the Department of Agronomy, Sher-e- Bangla Agricultural University, Dhaka-1207 during July to December, 2018 in T. aman season to evaluate the residual effect of organic manure and different levels of chemical fertilizer. The experiment consisted of two factors viz- Factor A: Organic manure (3 levels); O 0 : Control (Without organic manure), O 1 : Cowdung and O : Vermicompost and Factor B: Chemical Fertilizer doses (4 levels); F 0 ii 2 = Control(without fertilizer), F = 50% of RDF (Recommended dose of all chemical fertilizer), F 2 = 75% of RDF and F 3 1 = RDF . Cowdung and vermicompost were applied in the pot @ 10 and 5 ton ha -1 during wheat cultivation. Recommended doses of fertilizers such as urea, TSP, MOP and zypsum were applied in the pot @ 90, 55, 60 and 55kgha -1 during T. aman rice cultivation. The experiment was laid out in Completely Randomized Design (CRD) with three replications. Results revealed that residual effect of different organic manure and chemical fertilizer treatment exerted significant effect on most of the yield and yield contributing parameters studied in this experiment. Similarly, most of the traits were also affected significantly due to the combination effect. Among the residual effect of treatments, vermicompost (O ) showed best results in terms of plant height, dry matter, filled grains panicle -1 2 , 1000-grain weight, grain yield, straw yield, biological yield, harvest index. For chemical fertilizer, the treatment F (RDF) showed outstanding performance for getting the better growth and higher yield compared to those of other treatments. Most of the studied traits were also influenced significantly due to the interaction effect of O 2 F 3 but F 2 3 (75% of RDF) treatment also showed similar performance with F The interaction of vermicompost with RDF and 75% of RDF(O 2 F 3 and O 2 F ) showed the higher yield (5.90 and 5.87 t ha -1 2 respectively) which may be attributed to higher number of effective tillers hill - 1 (10.47 and 9.83, respectively), 1000 grain weight (20.60 g and 20.27 g, respectively), grains panicle -1 (102.83 and 99.67, respectively) in this two interaction treatments. Considering the above fact, organic manure O (vermicompost) and chemical fertilizer F 2 (75% of RDF) and combination O 2 F 2 2 could be considered the best fertilizer management practice which reduces the use of 25% chemical fertilizer in BRRI dhan34 cultivation.