Understanding Organic and Inorganic Fertilizers

摘要

In regions of the world where crop yields are extremely high, farmers add large amounts of fertilizer, usually in the form of a commercial product, which they purchase at considerable expense from a farm supply dealer. In much of the world such capital-intensive agriculture is impossible because of its high cost and often would be unwise due to the uncertainty of rainfall, insufficient length of growing season, or possible lack of demand for the crop at harvest. Nevertheless, addition of some fertilizer may be economically justified. The decision as to whether or not to use fertilizer to increase crop yield is described in the report.