The Marijuana Grower's Handbook: The Indoor and Greenhouse by Ed Rosenthal

By Ed Rosenthal

Acknowledged sixth variation: "Revised, multiplied, up-to-date" 1991 ed; disguise very faintly rubbed, edges very calmly rubbed/bumped; edges very faintly dirty; binding tight; conceal and inside intact and intensely fresh; a pleasant reproduction.

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3 ounces, a little less than half a cup (4 ounces). 2 ounces produce 2 cubic feet of C02, 3 ounces produce 5 cubic feet of C02, 6 ounces produce 10 cubic feet of C02. To find out fuel usage, divide the number of BTU's produced by 21,800. 55 pounds of fuel per hour. 21 pounds are needed. To calculate the number of minutes the generator should be on, the amount of fuel needed is divided by the flow rate and multiplied by 60. 9 minutes. The C02 required for at least one grow room was supplied using gas lamps.

There are a number of sources of artificial lighting. Cultivators rarely use in- candescent or quartz halogen lights. They convert only about 29 Chapter 11: Lighting and Lights l0% of the energy they use to light and are considered inefficient. CHART 10-1: FOOTCANDLES 1/60 Second, ASA 100 1/125 Second ASA 100 F-Stop Footcandles F-Stop Footcandles Growers have used fluorescent tubes to provide light for many years. They are inexpensive, are easy to set up, and are very effective. Plants grow and bud well under them.

The plant makes a sugar molecule using light for energy, C02 which is pulled out of the air, and water, which is pulled up from its roots. Scientists believe that early in the Earth's history the atmosphere contained many times the amount of C02 it does today. Plants have never lost their ability to process gas at these high rates. In fact, with the Earth's present atmosphere, plant growth is limited. When plants are growing in an enclosed area, there is a limited amount of C02 for them to use.

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