MANAGEMENT OF MINERAL NITROGENOUS FERTILIZERS AND MAKING USE OF BIOFERTILIZERS THROUGH DIFFERENT GENOTYPES OF WHEAT

Abstract

This study was carried out at El- Ismailia Agricultural Research Station, Egypt during the three successive seasons started from 1996/97 and lasted

1998/99.

The objective of this investigation was to study the relationship between different newely wheat genotypes and higher response to use biofertilizers plus reducing amounts of mineral nitrogenous fertilizer. Secondly, the effect of biofertilizer on yield and yield components through half diallelic crosses. The ten locally developed wheat varieties; Giza155, Giza 164, Giza

167, Sakha69, Sakha8, Gemmeiza1, Gemmeiza3, Sahell, Sids6 and Sids7 were evaluated during the season 1996/1997.for their response to the different nitrogen fertilization treatments A, B, C, and D. in a randomized complete blocks design with three replications. The mineral nitrogen fertilizer used was ammonium sulfate 20.5% N, while the Cerealin (Bacillus polymyxa) was used in the biofertilizer treatments. Six parents were chosen according to the results of the first season, i.e.

Sids 7, Gemmeiza3, Sakha 69, Giza164, Gizal67 and Gemmeizal. Were grown 1997/1998 season for more studies under such conditions and to be crossed in all possible combinations without reciprocals, to obtain fifteen diallel crosses. Nitrogenase activity in the soil samples surroundings roots of each variety in each treatment were determined as an indicator for biofertilization response (microbial activity). The six genotypes and their fifteen F 1 hybrids were grown under the

same fertilization treatments A, B, C and D, using the same experimental design and replicates