Efficacy of Different Organic Manures and Inorganic Fertilizer on the Yield and Yield Attributes of Boro Rice

This study was conducted to evaluate the efficacy of different organic manure and inorganic fertilizer on the yield and yield attributes of Boro Rice ( Oryza sativa L.). The experiment consisted of 8 treatments, T 0 : Control, T 1 : 100% N 100 P 15 K 45 S 20 (Recommended dose), T 2 : 50% NPKS + 5 t cowdung ha -1 , T 3 : 70% NPKS + 3 t cowdung ha -1 , T4: 50% NPKS + 4 t poultry manure ha -1 , T5: 70% NPKS + 2.4 t poultry manure ha -1 , T 6 : 50% NPKS + 5 t vermicompost ha-1and T 7 : 70% NPKS + 3 t vermicompost ha -1 . At 30, 50, 70, 90 DAT and at harvest stage the tallest plant (24.18, 31.34, 44.67, 67.05 and 89.00 cm) and the greatest number of total tiller per hill (5.43, 11.64, 21.01 and 17.90) at same DAT was recorded from T 5 and the lowest was observed from T 0 in every aspect. The maximum number of effective tillers per hill (13.52), the longest panicle (24.59 cm), maximum number of total grain per plant (97.45), the highest weight of 1000 seeds (21.80 g), the maximum grain yield (7.30 t ha -1 ) and straw yield (7.64 t ha -1 ) was recorded from T 5 treatment whereas the lowest number of effective tillers per hill (6.07) , the shortest panicle (16.45 cm) , the minimum total grain per plant (69.13) , the lowest weight of 1000 seeds (16.73 g), the lowest grain yield (2.06 t ha -1 ) and straw yield (4.63 t ha -1 ) was observed from T0 treatment. Although the highest biological yield was recorded from T 5 treatment but statistically similar result were found from T 3 , T 4 and T 7 treatments. The highest harvest index also recorded for T 5 treatment. It was obvious that yield of rice can be increased substantially with the judicious application of organic manure with chemical fertilizer. Keywords: Cowdung; poultry manure; vermicompost; NPKS; yield; yield contributing characters; boro rice DOI:  http://dx.doi.org/10.3329/agric.v9i1-2.9486 The Agriculturists 2011; 9(1&2): 117-125