Season Bio-fertilizertreatment** 0% RRReferencegrain yield(kg·ha−1) Inorganic fertilizer treatment * 25% RR 50% RR AEN*** 100% RR (kg grain yield increase kg−1 N applied) 2008/09 DS BG   12 8 9   BN   23 14 8   BS   17 5 9   Control 4062 13 9 6 2009 WS BG   3 13 5   BN   23 12 8   BS   12 9 9   Control 1902 4 3 3 2010 WS BG   41 28 13   BN   51 39 16   BS   42 26 15   Control 3389 38 20 15 2010/11 DS BG   29 19 15   BN   42 24 14   BS   36 23 14   Control 3801 21 15 12 * RR: Recommended rate: 120-60-60 kg N-P2O5-K2O ha−1 in the DS; 90-30-30 kg N-P2O5-K2O ha−1 in the WS; ** Biofertilizer treatments are described in detail in the text; * ** For the estimation of AEN in each experimental season, the grain yield of the treatment without inorganic fertilizer and biofertilizer (0% RR and Control) was used as reference.

Table 6: Estimated agronomic efficiency (AEN) of applied N depending on the inorganic fertilizer treatment and the biofertilizer used.