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.
Lettuce is one of the best vegetables for growing in containers. Lettuce roots monopolize the top few inches of soil to form their leaves. As long as it gets regular water, lettuce can thrive in salad trays as shallow as 4â (10 cm).Grandmothers who used to grow lettuce in old dresser drawers knew this.rowing lettuce is easy in any good garden soil. Incorporate 2-3â (5-8 cm) of garden compost or composted manure in the bed at planting time. If youâre not using manure, for really luxurious growth you can add an organic nitrogen source at the time of planting.