Effect of organic manure, biofertilizers, inorganic nitrogen and zinc on growth and yield of rabi rice (Oryza sativa L.)

摘要

Field experiments were conducted during rabi 1995-96 and 1996-97 to study the effect of organic and inorganic nitrogen with zinc on growth and yield of rice. The study revealed that application of either green manure (Sesbania aculeata at 6.25 t ha~(-1) or FYM 12.5 t ha~(-1) combined with Azospirillum (2 kg ha~(-1)) significantly increased the growth attributes than the combined application of Azolla (1 t ha~(-1)). Among the levels of N (112.5, 150 and 187.5 kg ha~(-1)) with or without 25 kg ZnSO4 ha~(-1), combined application of 187.5 kg N ha~(-1) + 25 kg ZnSO4 ha~(-1) though recorded significantly the higher growth attributes it was comparable with 150 kg N ha~(-1) + 25 kg ZnSO4 ha~(-1). Application of GM with Azospirillum recorded significantly shorter period for 50 per cent flowering, highest number of productive tillers m~(-2), filled grains per panicle, panicle length and grain yield (5282 and 5218 kg ha~(-1)) in both the years. Eventhough the highest level of N (187.5 kg ha~(-1)) along with Zn application recorded significantly higher yield attributes and yield (5516 and 5376 kg ha~(-1)) it was comparable with 150 kg N ha~(-1) with Zn.