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Gross primary production consists of the amount of light energy that is converted to chemical energy by photosynthesis per unit of time. This chemical energy is going to two places-- respiration and growth of new biomass. Net primary production omits the energy used in respiration... just the energy going to new plant growth.

Mathematically: (R = respiration)

NPP = GPR - R

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14y ago
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11y ago

gross is the money you get paid before the government takes part of it. net is the amount you actually take home to spend.

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Q: What is the difference between net productivity and gross productivity?
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