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.
It is important to know what kind of soil the perennials you are using in your containers prefer. If your soil is not in the correct pH range, the plant will not grow well if it grows at all. To make soil more acidic (to lower the pH), add aluminum sulphate or garden sulphur to the soil. This meter will measure the degree of acidity or alkalinity of your soil. 2  It is important to know what kind of soil the perennials you are using in your containers prefer. 3  If your soil is not in the correct pH range, the plant will not grow well if it grows at all.