A biological hazard is one originating from an organism that is foreign (in presence or concentration) to the organism being affected. Many biological hazards are associated with food, including certain viruses, parasites, fungi, bacteria, and plant and seafood toxins.hree people crossing the Atlantic in a rowboat face a hazard of drowning... Three hundred people crossing the Atlantic in an ocean liner face the same hazard of drowning... The risk to each individual per crossing is given by the probability of the occurrence of an accident in which he or she drowns...
The best soil mix for your container-grown vegetables is one that is well-drained, well-aerated and has a pH that is close to neutral. Soil-containing or soilless potting mixes offer all of these features.
I'm a tomato fanatic and grow them primarily for food, not for looks, so I put one plant per container (unless it an Earthbox or an enormous container or raised bed). Lots of people suggest growing herbs and other plants in the pot too. Not me. It's hard enough to give tomatoes the consistent amount of moisture they need without throwing in other plants that will compete for the water. Also, fill up that large container with a good quality potting soil and make sure you have good drainage.