Toward the Recent Advances in Nutrient Use Efficiency (NUE): Strategies to Improve Phosphorus Availability to Plants

Abstract

Achieving high nutrient use efficiency (NUE) and high crop productivity has become a challenge with increased global demand for food, depletion of natural resources, and deterioration of environmental conditions. Higher NUE by plants could reduce fertilizer input costs, decrease the rate of nutrient losses, and enhance crop yields. Nitrogen and Phosphorus are the most limiting nutrients for crop production in many of the world’s agricultural areas, and their efficient use is important for the economic sustainability of cropping systems. Furthermore, the dynamic nature of N and P in soil-plant systems creates a unique and challenging environment for its efficient management. Although numerous fertilizer recommendation methods have been proposed to improve NUE, technologies and innovative management practices are still lacking. Therefore, maximizing crop phosphorus (P) use efficiency (PUE) would be helpful in reducing the use of inorganic phosphorus fertilizers and their escape in the environment for sustainable agriculture. Improvement of PUE in cropping systems can be achieved through two main strategies: optimizing agronomic practice and breeding nutrient efficient crop cultivars that improves P-acquisition and -utilization efficiency. These strategies are needed for future food security and sustainable agriculture. The major revised points are the following: concept of NUE, application of nutrient stewardship, cereal-legume intercropping, regulating soil pH, etc., for enhancing phyto-availability of P and breeding P-efficient crop cultivars that can produce more biomass with lesser P costs and that acquire more P in P-stress condition. These approaches consider economic, social, and environmental dimensions essential to sustainable agricultural systems and afford a suitable context for specific NUE indicators.