Oxygen & Roots - Root zone temperature, Parsnip, Pythium
Micro-organisms - Soil life rhizobacterias, Asparagus, Viruses
Nutrients - Interaction between nutrients, Spinach, Broad mites
CO2 - The role of Carbon Dioxide, Bonsai trees, Springtails
Organic - Organic certification, Bio & mineral fertilisers, Soya, Nematodes...
Growing systems - Run-to-Waste, Rockwool, Garlic, Thrips
Light - Light & Flowering, Red & far red light, Mint, Aphids
Plagues & Diseases - Botrytis crop killer, Ginger, Preventing infections