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These are my recommendations for revising the article: Sustainable yield

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Sustainable Yield in Forestry
Sustainable yield is an important component of '''sustainable forest management. ''' In the forestry context it is the largest amount of harvest activity that can occur without degrading the productivity of the stock. '''Although efforts of sustainability date back to the 18th century, issues with the application still arise. There's basic knowledge to keeping a sustainable forest: having to know ecological limits, respecting different social values in regards to the forest, and knowing the importance of obtaining sustainability in a unified manner.'''

Sustainable Yield in Fishery
This concept is important in fishery management, in which sustainable yield is defined as the number of fish that can be extracted without reducing the base of fish stock, and the maximum sustainable yield is defined as the amount of fish that can be extracted under given environmental conditions. In fisheries, the basic natural capital or virgin population, must decrease with extraction. At the same time productivity increases. Hence, sustainable yield would be within the range in which the natural capital together with its production are able to provide satisfactory yield. It may be very difficult to quantify sustainable yield, because every dynamic ecological conditions and other factors not  related to harvesting induce changes and fluctuations in both, the natural capital and its productivity.

Sustainable Yield in Groundwater Applications
In the case of groundwater there is a safe yield of water extraction per unit time, beyond which the aquifer risks the state of overdrafting or even depletion.

