Effect of low soil temperature on phosphate nutrition of plants—A review

Response ofEriophorum vaginatumto CO2enrichment at different soil temperatures: effects on growth, root respiration and PO43−uptake kinetics

“…Although N is the most limiting nutrient in many tundra communities, P limitation is also widespread (Barel & Barsdate, 1978), particularly for the growth of Friophorum (Tamm, 1954;Shaver & Chapin 1995), Any changes in root POj^" uptake capacity might have a significant impact on Friophorum and therefore on tundra responses to elevated CO., Root POj^^ uptake requires expenditure of respiratory energy (Mengel & Kirkby, 1978;Bieleski & Ferguson, 1983), Because CO^ enrichment often enhances root supply of carbohydrate substrates for respiration (Tschaplinski, Norby & Wullschleger, 1993;BassiriRad et al, 1996), we hypothesized that elevated CO., might lead to increased root PO4^" uptake. Soil temperature has a marked effect on uptake of all macronutrients (Clarkson, Hopper & Jones, 1986), including PO^'*" uptake in Friophorum (Chapin, 1977;Chapm, Van Cleve & Chapin, 1979) and other species (Jeschke & Simonis, 1965 ;Sutton, 1969), The effect of root temperature on ion uptake is likely to be regulated via changes in root import of photoassimilates and respiration rate (Farrar, 1988), Therefore, we also hypothesized that the nature and the magnitude of changes in PO,,^" uptake at high CO, would depend on soil temperature. The effects of soil temperature are of particular importance in the Arctic because global warming is expected to be more pronounced at high latitudes (Lashof & Ahuja, 1990;Maxwell, 1992), and models predict that arctic soil temperatures will closely track the increase in air temperature (Kane et al, 1992),…”

Effects of Soil Temperature on Phosphorus Extractability. I. Extractions and Plant Uptake of Soil and Fertilizer Phosphorus

“…Mots cl6s: Temp6rature, phosphore du sol, engrais, incubation, d6sorption The influence of soil temperature on crop response to fertilizer P is well documented (Simpson l96l; Nielsen and Humphries 1966;Sutton 1969). In general, more fertilizer P is required at low soil temperatures to ensure sufficient P uptake (e.g.…”

Nutrition of intensive pastures in the summer rainfall areas of southern Africa

“…The suggestion that ryegrass has a greater P requirement relative to clover is at variance with literature reports of legumes (reportedly because of their less pervasive root systems) being more responsive to P than grasses (Rayment & Bruce 1979;Mays et al 1980). Lower soil temperatures during the main growth period of ryegrass (autumn -winter -spring) may have contributed to the steep P response of this grass relative to the responses of the summer-growing kikuyu and clover; a decrease in P availability with decreasing soil temperature has been widely reported (Sutton 1969;Barber 1980). Pasture field experimentation in Natal has highlighted the importance of a favourable P status for successful pasture establishment.…”