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Explain and Evaluate the Impact of the Ways in Which Agriculture Has Increased Net Productivity.

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Explain and evaluate the impact of the ways in which agriculture has increased net productivity.

Agricultural ecosystems are made up of largely domesticated animals and plants to be used as food for mankind. There are considerable losses of energy at each trophic level of a food chain and since humans are often at the third or fourth trophic level, the energy we receive is only a small proportion available from the sun at the start of the food chain.
Agriculture tries to ensure that as much of the available energy from the sun is transferred to human by increasing the productivity of a food chain.

Productivity is defined as: the rate at which something is produced e.g. Plants are called producers because they produce chemical energy.
The rate at which plants assimilate this chemical energy is called gross productivity.
Gross productivity is measured for a given area during a given period of time, usually in kJm-2 year-1. Typically around 20% of this chemical energy is used by the plant for respiration. The remainder is known as net productivity which is available to the primary consumer in the food chain
Net productivity:
Net productivity = Gross productivity - Respiratory losses.

There are two main factors affecting net productivity:

- Efficiency of the crop carrying out photosynthesis: efficiency is improved if all the necessary conditions are supplied and there are no limiting factors.

- Area of ground covered by leaves of the crop.

In a natural ecosystem, productivity is relatively low as there is only solar energy and no additional energy input whereas in an agricultural ecosystem, additional energy is used to increase the productivity of a crop by reducing the effect of limiting factors.

Natural Ecosystem
Agricultural Ecosystem
Solar energy - no additional input.
Solar energy plus energy from food and fossil fuels.
Lower

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