A collection of nine investigations for students enabling them to follow those transformations occurring in the soil which result in the recycling of nitrogen and the maintenance of fertility.

Experiments include:

• Nitrogen fixation by Azotobacter and Rhizobium
• Hydrolysis of proteins - gelatine - casein - blood protein
• Deamination of peptone
• Oxidation of ammonia and nitrite
• Denitrification of Nitrate

The kit contains:

• Mannitol Salts Medium
• Nutrient Gelatine
• Peptone Water
• Agricultural Dried Blood
• Glucose Yeast Extract
• Nutrient Casein Agar
• Crystal Violet Solution
• Nitrate Formation Medium
• Nitrate Broth Medium
• Ammonium Test Strips
• Nitrate Test Strips
• Full instructions

Additional materials required (not included):

• Petri Dishes
• Air dried soil
• Pipettes
• Sterile inoculating loop
• Test Tubes (sterilised)
• Parafilm
• Cotton Wool
• Glass Microscope Slides