الفهرس 
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Abstract
This study was carried out at the Department of Agriculture Microbiology, Faculty of Agriculture, Minia University, during the 2004/ 2005 season under greenhouse conditions. Trials were made to evaluate growth, chemical contents as well as proliferation of certain microorganisms in the rhizosphere of two important medicinal plants: fenugreek (Trigonella foenum graecum) and coriander (Coriandrum sativum).
The first step in this work was to evaluate the effect of mineral, biological and organic fertilizers on growth, chemical contents and occurrence of certain microorganisms in the rhizosphere of fenugreek and coriander plants. Results could be summarized as follows:
1- Application of compost and biofertilizers gave the highest records of plant height, fresh and dry weights of fenugreek and coriander plants as compared with mineral fertilizers.
2- Application of biofertilizers gave the highest micorrhizial root infection percentage of the roots of fenugreek and coriander plants and also the highest nodule numbers on fenugreek roots compared to organic or mineral fertilizers.
3- Application of mineral fertilizers gave the highest chemical contents (nitrogen, phosphorus or potassium) of fenugreek and coriander plants compared with the application of organic or biological fertilizer.
4- Application of biological fertilizer gave the highest growth of total microbes, azotobacters P-dissolver and cilicote dissolvers, in the rhizosphere soil of fenugreek and coriander plants compared with the application of organic or mineral fertilizers.
The second step in this work was to evaluate the effect of the treatment in which related mineral fertilizers were substituted by relevant biological fertilizers on growth parameters and chemical contents of fenugreek and coriander plants. Results are summarized as follows
1- Application of mineral fertilizers with inorganic nitrogen substituted by Rhizobium or Azotobacter gave the highest records of plant height, fresh and dry weights of fenugreek and coriander plants, and also the highest nodule numbers on fenugreek roots compared with the application of mineral fertilizer in which phosphorus or potassium were substituted by VA mycorrhizae or by B. circulans.
2- Application of mineral fertilizers in which nitrogen was substituted by Rhizobium or Azotobacter, gave the highest nitrogen content of fenugreek and coriander plants sampled at 60 days.
3- Application of mineral fertilizers in which phosphorus was substituted by VA mycorrhizae gave the highest phosphorus content of fenugreek and coriander plants sampled at 30 days.
4- Application of mineral fertilizers in which potassium was substituted by B. circulans gave the highest potassium content of fenugreek and coriander plants sampled at 45 days from sowing compared with the application of mineral fertilizers in which nitrogen or phosphorus were substituted by Rhizobium, Azotobacter or VA mycorrhizae
The third step in this work was to evaluate the effect of the treatments in which organic fertilizer was combined with different biofertilizers, on growth and chemical contents of fenugreek and coriander plants. Results could be summarized as follows:
1- Application of compost in addition to Rhizobium or Azotobacter gave the highest records of plants height, fresh and dry weights of fenugreek and coriander plants compared with the application of compost combined with VA mycorrhizae or B. circulans.
2- Application of compost in conjugation with Rhizobium or Azotobacter gave the highest nitrogen contents of fenugreek and coriander plants sampled at 60 days after sowing, and also gave the highest total microbial counts, compared with the application of compost combined with VA mycorrhizae or B. circulans.
The final step in this work was to evaluate the effect of mineral or organic fertilizer in addition to inoculation with the triple biofertilizer on growth, chemical contents and occurrence of certain microorganisms in the root zone of fenugreek and coriander plants. Results could be summarized as follows:
1- Application of compost in conjugation with triple biofertilization gave the highest records of plant growth parameters; mycorrhizal root infections, chemical contents and proliferation of certain microorganisms in the root zone of fenugreek and coriander plants, when compared with the application of the recommended full dose of mineral fertilizers beside triple biofertilization.