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.
Tomatoes in gardens have an advantage over container plants -- they can spread their roots out far and deep in search of water. Even so, the same rule of thumb about even soil moisture applies. Tomato plants need about 1 to 1 1/2 inches of water each week to fruit, according to Ohio State University. There's no need to measure, so long as you maintain an even soil moisture. At the beginning of the growing season, this may mean watering in the morning until the soil is thoroughly damp and remains damp all day.