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.
Potting Soil. Commercial all-purpose potting soil and be used as the soil base for your Christmas cactus, but must be amended to improve drainage and promote aeration. Mix one-part potting soil to one-part builder's sand or perlite.This creates a porous soil suitable for succulents.sing garden soil to make potting medium for Christmas cacti requires sterilizing the soil first to prevent injuries to the plant from soil-borne pathogens. Subject the soil to a temperature of 160 degrees Fahrenheit for 30 minutes.