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GROWING GOURMET - Anto2ni.it

GROWING GOURMET - Anto2ni.it

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CHAPTER 7<br />

Biological Efficiency:<br />

An Expression of Yield<br />

Mushroom strains vary in their abil<strong>it</strong>y to convert substrate<br />

materials into mushrooms as measured by a simple formula<br />

known as the "Biological Efficiency (B. E.) Formula" originally de-<br />

veloped by the Wh<strong>it</strong>e Button mushroom industry. This formula states<br />

that<br />

• 1 lb. of fresh mushrooms grown from 1 lb. of dry substrate is 100%<br />

biological efficiency.<br />

Considering that the host substrate is moistened to approximately<br />

75% water content and that most mushrooms have a 90% water<br />

content at harvest, 100% B. B. is also equivalent to<br />

• growing 1 lb. of fresh mushrooms for every 4 lbs. of moist sub-<br />

strate, a 25% conversion of wet substrate mass to fresh mushrooms<br />

or<br />

• achieving a 10% conversion of dry substrate mass into dry<br />

mushrooms.<br />

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