Introductory Microbiology (1+1)

Importance of Soil fertility

• Parasitism Is defined as a relationship between organism in which one organism lives in or on another organism. The parasite feeds on the cell, tissues or fluids of another organism the host, which is commonly harmed in the process. The parasite depends upon the light and lives in intimate physical and metabolic contact with the host.
• All major groups of plants, animals and micro organisms are susceptible to attack by microbial parasites. There are many strains of fungi which are parasitic on algae and other fungi by penetration into the host. Viruses which attack bacteria, fungi and actinomycetes are strictly intercellular parasites.
• Protozoans are prove to parasitic attack as well specialized fungi penetrate the protozoans and destroy the cell. In addition to lysis associated with the actions of neighbouring heterotrophs, microorganism may autolyse merely because of nutrient deficiency. Antagonistic interrelationships are also very common among the soil population where by one organisms directly or indirectly affects the activities of another organisms.

  1. Competition among micro organism for available nutrition. This may occur between the same group, as between two types of (B), or between different organic (F, B, A).
  2. Creation of one organic of conditions which are unfavourable for the growth of another (change in pH).
  3. Production by one organic for specific substances which are injurious to growth of other organic alcohols, quinones and antibiotics.
  4. Direct parasitism of one organic upon another various effects of (F) upon (B), and (B) upon (F).