Effects of soil waterlogging on the concentration and uptake of selected nutrients by wheat genotypes differing in tolerance
2000
Tarekegne, A. (University of the Orange Free State, Bloemfontein (South Africa). Department of Plant Breeding) | Bennie, A.T.P. (University of the Orange Free State, Bloemfontein (South Africa). Department of Soil Science) | Labuschagne, M.T. (University of the Orange Free State, Bloemfontein (South Africa). Department of Plant Breeding)
Waterlogging of soil may restrict crop performance by altering soil mineral nutrient availability to and uptake by roots. A greenhouse experiment was conducted in 1998/99 using a soil high in clay content (Vertisol), at the University of the Orange Free State, South Africa, to determine the effects of soil waterlogging on Cu, Zn, p and K nutrient concentration and uptake by wheat genotypes that differ in tolerance to waterlogging. Differential response of wheat genotypes to waterlogging treatments was observed on vegetative dry biomass, straw and grain yields. Root zone oxygenation was significantly depressed by the waterlogging treatments as indicated by significantly reduced soil redox potentials. Both waterlogging and genotype treatments significantly affected the uptake and concentration of most of the nutrients in the vegetative biomass at anthesis or in the straw and grain at maturity .A significant differential response of wheat genotypes to waterlogging treatments was detected for most nutrient concentrations and uptake parameters. Compared to waterlogging tolerant genotypes, sensitive genotypes appeared to accumulate less Cu, Zn, p and K. There was a considerable difference between waterlogging-sensitive and tolerant wheat genotypes reflected in the accumulation and uptake of these nutrients under waterlogging stressthe damaging effects of waterlogging were therefore attributed to decreased nutrient uptake due to 02 deficiency in the root zone, in particular resulting in p and Zn deficiency. Selection of genotypes with enhanced ability to overcome waterlogging-induced nutrient deficiency, particularly p and Zn deficiency, should improve wheat productivity in waterlogged soils.
Показать больше [+] Меньше [-]