Intermediate-day Onions produce bulbs where the total amount of daylight is approximately 12-14 hours, which is the amount mid-section states receive in the summer. Intermediates are also known as day-neutral onions. Long-day Onions produce bulbs where the total amount of daylight is 14-16 hours.
Anaerobic Zone. The anaerobic zone is slightly more intense than the aerobic zone. Anaerobic means without oxygen, so don't be surprised if you are unable to speak except for short words at a time in this zone. The anaerobic zone is 80 to 90 percent of your maximum heart rate.erobic Zone. The aerobic target zone is 70 to 80 percent of your maximal heart rate. Multiply your maximum heart rate by this percentage to determine the intensity you must maintain to remain in this zone.
The oxygen passes into the atmosphere and the hydrogen joins with carbon dioxide to produce biomass. When living things need energy they take in oxygen for respiration. The oxygen returns to the atmosphere in the form of carbon dioxide. Oxygen gas is fairly soluble in water, which makes aerobic life in rivers, lakes and oceans possible. Natural abundance. Oxygen makes up 21% of the atmosphere by volume. This is halfway between 17% (below which breathing for unacclimatised people becomes difficult) and 25% (above which many organic compounds are highly flammable).