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

Abstract

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, T₀: Control, T₁: 100% N₁₀₀P₁₅K₄₅S₂₀ (Recommended dose), T₂: 50% NPKS + 5 t cowdung ha^-1, T₃: 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, T₆: 50% NPKS + 5 t vermicompost ha-1and T₇: 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 T₅ and the lowest was observed from T₀ 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 T₅ 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 T₅ treatment but statistically similar result were found from T₃, T₄ and T₇ treatments. The highest harvest index also recorded for T₅ 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