Strategies to Enhance the Efficiency of Phosphate Fertilizers

Abstract

Phosphorus (P) is a crucial nutrient for crop growth, but its unavailability due to fixation in the soil significantly hampers crop productivity. A low efficiency of P utilization, ranging between 10-20%, results in accumulation of P in the soil, and continuous fertilization exacerbates this degree of P fixation. Given that rock phosphate, the primary source of inorganic P, is a finite resource, there is a looming risk of its depletion in the near future. Consequently, it is essential to enhance the P use efficiency of native soil resources to counteract the dwindling use of raw materials for P fertilizer production. To address this challenge, various innovations and technologies have been developed and are increasingly being adopted in agriculture worldwide. These innovations aim to reduce the conversion of soluble P from conventional phosphate fertilizers into unavailable forms in the soil. One such solution is the use of enhanced-efficiency fertilizers, which include a range of phosphate fertilizers designed to inhibit P fixation. These fertilizers come in different forms, such as chemically modified, controlled-release, blend, multifunctional, and synergistic phosphate fertilizers, each contributing to improved P availability and utilization by plants.