The role of tolerant genotypes and plant nutrients in reducing acid-soil infertility in upland rice ecosystem: an appraisal

Abstract

Acid-soil-related infertility is a major constraint in the humid tropical regions. Soil infertility problems result from low pH, aluminum toxicity, phosphorus deficiency, low silicon and low base saturation, and the interactions between various deficiencies and toxicities. Phosphorus (P) deficiency is identified as a major nutrient deficiency in acid upland soils; and not only are the soils are low in P but also the applied soluble P is rendered unavailable due to reactions with iron and aluminum oxides. Upland rice cultivars differ in tolerance for and adaptation to acid soil conditions. In this paper, recent research on the role of tolerant genotypes adapted to acid soil conditions and plant nutrients, especially P, in reducing acid soil infertility in upland rice is reviewed. Synergy between genetic tolerance and P nutrition seems critical for sustainable productivity enhancement.