Abstract

A field experiment was conducted in two consecutive seasons (2009 and 2010) to assess the effect of two microbial fertilizers, chicken manure, urea and their possible combinations on the performance of a maize variety (Hudeiba 45). The bio fertilizers used were Azospirillum brasilense (A), Azotobacter sp (B) and chicken manure (CM) at a rate of 7t/ha). Urea (46% N) was applied at rates of 120kg/ha (N) and 40kg/ha (T). The combinations used were Azospirillum brasilense with urea (A+T), Azotobacter sp with urea (B+T), A+CM and B+CM in addition to control. The field experiment was laid out in a Randomized Complete Block Design with four replicates. Four seeds were sown in holes with 20 cm between holes in 4×4 m² plots with 5 ridges 70 cm apart. Sowing was carried out in the last week of October in 2009 and the first week of November in 2010. The fertilizers were applied on one side of the ridge and plants were irrigated at seven days intervals. Data were collected on cob length, cob diameter, number of rows/cob, number of seeds/row, 100-grain weight, grain yield/plant and grain yield/ha. Data were collected for yield components at physiological maturity and for grain yield after harvesting. The moisture, ash, fat, crude fiber, crude protein, tannins and carbohydrates contents of the grains were determined. Results showed that biofertilizers have significantly (p < 0.05) increased crop productivity. CM increased the grain yield (t/h) by 20 and 30% over the control in 2009 and 2010, respectively. Application of chicken manure solely or in combinations with Azosprillum barasilence or Azotobacter sp have also increased grain yield and its components. The combinations of N₂ fixer inoculants with manure and/or urea improved grain quality of maize under field conditions.

Key words:  Azosprillum barasilence, Azotobacter sp, maize, chicken manure, grain yield.