Effects of temperature on phosphate sorption isotherms and phosphate desorption

Abstract

Phosphorus sorption isotherms were constructed for two Idaho soils with widely different chemical properties. The soils were equilibrated with various amounts of Ca(H 2 PO 4 ) 2 in 0.01 M CaCl 2 for 1, 3, 7, and 11 days at temperatures of 5°C and 20°C. The two soils which had been equilibrated previously for 11 days at 20°C with various amounts of Ca(H 2 PO 4 ) 2 in 0.01 M CaCl 2 were desorbed at 5°C and 20°C.The rates of sorption and desorption were decreased as the equilibration temperatures were lowered. The effect of temperature on these processes was detected during the first day of equilibration. Less P was found in the equilibrating solution at the lower temperature. The two soils varied widely in sorption and desorption properties.

Phosphorus sorption by freeze–thaw treated wetland soils derived from a winter-cold zone (Sanjiang Plain, Northeast China)

“…These results mean there was no significant effect of freezing on sorption at 25°C. Gardner and Jones (1973) have reported a similar result, which laboratory studies have shown decreased sorption as temperature is lowered (20 to 5°C). Sorption of P was described by the Langmuir equation.…”

Arbuscular mycorrhizal fungal colonization is considerable at optimal Olsen-P levels for maximized yields in an intensive wheat-maize cropping system

“…One reason for the different growth responses between the two corps is considered due to the effect of soil temperature on P uptake by plants (Tang et al, 2009). It is found that soil P desorption and consequently availability to plants is greater at higher temperature (Gardner and Jones, 1973;Sánchez and Boll, 2005). As in this rotation system, wheat is grown during cooler months of the year when soil temperature is low, thus P uptake would be low compared to maize, which is grown during warmer months of the year with higher soil temperature.…”

Determining critical values of soil Olsen-P for maize and winter wheat from long-term experiments in China

“…Abbreviations: LL, linear-linear; LP, linear-plateau; Exp, Mitscherlich type exponential model temperature on the inorganic P uptake by crop. Winter wheat was grown early in the year when temperature is low, thus P uptake would be low compared to maize, which was grown in later part of year when temperature is high (Gardner and Jones 1973;Sharpley and Ahuja 1982;Sánchez and Boll 2005). When soil Olsen-P level is above the critical value, further P fertilizer application is not justifiable and could increase the amount of P accumulations in soil and losses to water bodies (Heckrath et al 1995;Pote et al 1996;Shepherd and Withers 1999).…”