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.

Response of interspecific and sativa upland rices to Mali phosphate rock and soluble phosphate fertilizer

“…This could be due to the increased production of organic acids excluded by roots of some crop species that enhance PR dissolution and P availability to the plants (Zapata and Roy 2004). Also, there are varietal differences for tolerance to soil acidity among Oryza sativa rice as reported by Sahrawat et al (2000).…”

Soil Testing as a Tool for On-Farm Fertility Management: Experience from the Semi-arid Zone of India

“…The strategy is based on the use of crop cultivars that are adapted to the harsh conditions of the SAT regions especially water stress and nutrient deficiencies. The soil, water and nutrient management practices are developed around the adapted cultivars to realize the potential of the cultivars in diverse production systems (Ae et al 1990;Condon et al 2004;Hiradate et al 2007;Passioura 2006;Bationo et al 2008;Sahrawat 2009;Passioura and Angus 2010). Source: Unpublished results from ICRISAT.…”

Nutritionally Enhanced Staple Food Crops

“…Clearly, the lowland rice ecology provides a better growing soil environment than does the upland ecology for rice growth and yield and Fe or Zn accumulation by the crop. Furthermore, it has been demonstrated that the availability of nutrients especially of Fe and Zn to rice in soils is greatly influenced by water regime (including flooding) and the availability of Fe and Zn is generally favorably affected in the lowland irrigated agroecologies (Ponnamperuma 1972;Gao et al 2006;Sahrawat 2007Sahrawat , 2009). …”