Soil phosphorus status, pH and the manganese nutrition of wheat

Abstract

A pot experiment was carried out in order to test the hypothesis that manganese nutrition of wheat was dependent on the phosphorus status of soil as well as on its pH and manganese status. An arable mineral soil whose lime and phosphorus status had been massively adjusted more than 18 years previously was compared with identical soil not so adjusted. Wheat plants were grown to maturity in these soils. Analyses were carried out on both soil and plant samples at intervals. Data for soil pH, soil solution concentrations of manganese and phosphorus, plant dry weight and tissue concentrations of manganese and phosphorus are presented. Concentrations of manganese were depressed in leaf tissue of plants from limed soils and also in high phosphorus soils. The depressed values for limed treatments were explained in terms of depressed soil solution manganese concentrations resulting from elevated pH. The results for high phosphorus soils could not be related to soil solution composition. It was suggested that high soil phosphorus resulted in elevated plant phosphorus which interfered in the uptake and/or translocation of manganese.

Effects of Manganese Nanoparticle Exposure on Nutrient Acquisition in Wheat (Triticum aestivum L.)

“…This property is likely due to their tendency to transform into other less bioavailable forms, such as homo aggregation or hetero aggregation/precipitation into insoluble complexes with other soil constituents, such as phosphate [42]. Indeed, a role for P in inhibiting Mn accumulation in wheat has been noted [43], which may be applicable in the present study, given the relatively high level of added P in the soil.…”

Manganese distribution and speciation help to explain the effects of silicate and phosphate on manganese toxicity in four crop species

“…In contrast to Si, it is uncertain if increased phosphorus (P) supply improves a plant's tolerance to high Mn. High soil P decreased Mn in wheat ( Triticum aestivum ) shoots (Neilsen et al ., ) but not in perennial ryegrass ( Lolium perenne ) (Le Mare, ) or soybean ( Glycine max ) (Nogueira et al ., ). Rosas et al .…”

“…In contrast to Si, it is uncertain if increased phosphorus (P) supply improves a plant's tolerance to high Mn. High soil P decreased Mn in wheat (Triticum aestivum) shoots (Neilsen et al, 1992) but not in perennial ryegrass (Lolium perenne) (Le Mare, 1977) or soybean (Glycine max) (Nogueira et al, 2007). Rosas et al (2011) reported that high P ameliorates Mn toxicity in perennial ryegrass and white clover (Trifolium repens) despite increased Mn in roots and shoots.…”

Micronutrient Deficiencies in Global Crop Production

“…A glasshouse experiment was designed to compare Mn concentrations in soil solutions and the Mn nutrition of wheat plants in soils which had received different amounts of both P and lime some 18 years previously (Neilsen et al, 1992). These treatments had significantly altered both P status and soil pH.…”

“…However, the results for high P soils could not be related to soil solution composition. Neilsen et al (1992) suggested that high soil P resulted in elevated plant P that interfered in the uptake and/or translocation of Mn, rather than by a direct effect of soil chemistry on Mn availability.…”