2026-06-27http://hdl.handle.net/123456789/182310The increasing pressure on the land of a fast-growing world population has made it necessary to intensify agricultural production. Efficient use of mineral fertilizers has proved to be a quick way of boosting crop yields per unit area of land; however, it must be realized that cost and other constraints frequently deter farmers from using them in adequate quantities and balanced proportions.424application/pdfFAOBook (stand-alone)