Forage values in the forest 10 substantial sum (fig. 9). During 1949 they spent $65,000,000. While Montana is often called the copper State, the tourists' spending was three times the value of the copper mined that year. 'Actually, more than half of this area is unsuited for timber production.

The pasture is the main productive resource in the south of Chile. The dry matter productivity is related to the environment and efficient resource management. However the interrelationship between the factors involved in pasture productivity is a difficulty due to the large amount of information required to analyze. One way to determine the relationship between pasture productivity and environment is through decision trees models. These models can predict the potential effect of the environment and management applied. The objective of this review is to introduce the use of decision tree model as a tool for pasture management.

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