Land is an essential input (factor of production) for agriculture, and agriculture is by far the most important economic activity in preindustrial societies.

He strengthened capital availability, an essential and increasingly important economic input, in addition to labour and land improvements.

"Is his input essential right now?"

Thus they provide essential inputs to the design of the system.

Satellite observations are an essential input to numerical weather prediction systems and also assist the human forecaster in the diagnosis of potentially hazardous weather developments.

Our observations rise a fundamental question if E2 is not, in fact, an essential input for trophoblast differentiation.

Irrigation is the essential input to the soil for any vegetation to grow.

In the production of services," Mr. Dean wrote in an article that summarized the other findings, "the consumer often supplies an essential input.

Your views on the points sketched out here will be an essential input for the package, which we will adopt in December.

I would like to take this opportunity to acknowledge again the essential on-going input which the European Parliament is contributing to the work of the conference.