Which principle addresses the idea that not all land uses can be allocated separately?

The principle that addresses the idea that not all land uses can be allocated separately is the Principle of Consistent Use. This principle emphasizes the interconnectedness of land uses and asserts that various land uses must be compatible with one another to ensure sustainability and efficiency. In practical terms, this means that when zoning and planning for land use, decision-makers must consider how different uses interact and impact each other. For example, residential areas must coexist with commercial zones while minimizing negative effects like noise or pollution.

In contrast to the correct answer, the other principles focus on different aspects of land management. The Principle of Surplus Productivity, for example, deals with maximizing the output from a limited resource, while the Principle of Substitution refers to the idea of replacing one resource with another in production. Lastly, the Principle of Competition highlights how various land uses compete for the same resources or market space, but does not inherently address the compatibility or integration of those uses. Therefore, the Principle of Consistent Use is the most relevant framework for understanding the necessity of integrated land-use planning.