Owing to the potential hazardous effect on one hand, and the expensive costs of the
nitrogenous mineral fertilizers on the other hand, serious attempts are exerted nowadays to look for more suitable substitutes for such fertilizers. Organic untraditional sources such as chicken manure tea, urea sulfate, urea formaldehyde and the farmyard manure tea beside of biofertilivcrs were tried herein to fulfill such a target. This was executed through a pot experimcnt conducted on a sand clay soil and a clayey one packed uniformly in pots of 4 kg soil each. The pots were divided into two groups. The first group received nitrogen in the form of the different aforementioned untraditional fertilizers. The second group of pots was treated with the above mentioned materials in the presence of nitrogen fixing bacteria i.e. Azotobacter chrococcum (Azr), Arospirillum brasilense(Azs)and Bacillus meguterium as phosphorus dissolving bacteria. The aforementioned untraditional fertilizers were added to enrich the soil mainly with nitrogen at three rates corresponding to 60,90 and 120 kg N fed-1.The maize plants were sampled at end of the experiment and the plant materials were washed with distilled water, oven dried at 70○C and dry matter yields were recorded. The dried plant materials were sampled and wet digested with a mixture of perchloric and sulfuric acids to determine the concentrations of N,P ,K,Fe,Mn and Zn,
Results showed that there were significant differ among the studied untraditional
fertilizers with the chicken manure tea being, of the most pronounced effect on dry matter
yield and nutrients uptake. Such a finding was true whether for the plants grown on the
sandy clay loam soil or the clayey one. Likewise, significantly differences were detected among the used rates of the applied N regardless of its source, The interaction effects between source and rate of the applied N were also of significant effect on dry matter yield of maize, similarly, the interaction effects between each of the N -source and biofertilization rate of the applied nitrogen and the biofertilization treatment and among source, rate of N and the biofertilization treatment were of significant effects on maize dry matter yield and the uptake of the considered nutritive elements i.e. N, P, K, Fe, Mn and Zn. |
