Phosphorus sorption capacity of alkaline Manitoba soils and its relationship to soil properties

Abstract

Ige, D. V., Akinremi, O. O., Flaten, D. M., Ajiboye, B. and Kashem, M. A. 2005. Phosphorus sorption capacity of alkaline Manitoba soils and its relationship to soil properties. Can. J. Soil Sci. 85: [417][418][419][420][421][422][423][424][425][426]. The establishment of the P retention capacity of soil in Manitoba is essential for effective management of P in the region. However, the methods for determining the P retention capacity for neutral to calcareous soils in the Eastern Prairies are not well developed. The objectives of this study were to determine the P retention capacity of Manitoba soils and to generate equations that relate these capacities to other soil properties. One hundred and fifteen archived surface soils were selected and their physico-chemical properties were measured. These soils were used to generate a single-point P adsorption index by equilibrating 2 g of soil in 20 mL of 0.01 M KCl solution containing either 150 (P 150 ) or 400 (P 400 ) mg P L -1 . A subset of 26 of these soils was used for multipoint isotherms with P concentrations in the range of 0-1000 mg P L -1 . The data obtained were fitted to the Langmuir isotherm and the adsorption indices were correlated with the various soil properties that were then used to developed predictive equations of the P retention capacity of the soil. The values of the adsorption index, P 150, obtained from the single point adsorption study using 150 mg P L -1 , ranged between 88 and 891 mg P kg -1 , while that of P 400 ranged between 100 and 1250 mg P kg -1 . A better correlation was obtained between P 150 and soil properties compared with P 400 . For the 26 soil subset, the adsorption indices, S max 1 to S max 6, obtained from the Langmuir isotherm, ranged from 300 to 1330 mg kg -1 . A good correlation was obtained between the single point index and the multipoint isotherm (r = 0.93). Hence, S max for the 115 soils was estimated from the relationship between P 150 and S max 3 of the 26 soils. The best relationships between the adsorption parameters, P 150 and S max , and the soil properties were obtained with the sum of Mehlich-3 extractable Ca and Mg (R 2 = 0.66) and the sum of exchangeable Ca and Mg (R 2 = 0.64). Mehlich-3-Ca and -Mg each explained 56% of the variation, while clay content explained 40% of the variation in the P retention capacity of these soils. Unlike the widely reported influence of Al and Fe in acid soils, our study showed that the retention of P in Manitoba soils was influenced more by Ca and Mg and soil texture. Pour bien gérer l'utilisation du P au Manitoba, il est essentiel de connaître la capacité de rétention des sols. Malheureusement, les méthodes permettant de déterminer cette dernière dans les sols neutres ou calcaires de l'est des Prairies ne sont pas très développées. L'étude devait établir la capacité de rétention du P de ces sols au Manitoba et produire des équations reliant cette capacité à d'autres propriétés du sol. Les auteurs ont sélectionné 115 sols de surface en archive et mesuré leurs propriétés physicoc...

Influence of biosolids on phosphorus sorption characteristics of a Vertisol in comparison with manures and fertilizer

“…The fact that the Mg added with the organic amendments did not significantly change the Mg x of the soil suggests that this co-variable was not responsible for the differences in P sorption in the amended soils because Mg x has been reported to influence P sorption in most calcareous Manitoba soils (Ige et al 2005b). The cation exchange capacity of the amended soil appeared to have been increased by the BIO, HOG and DAIRY relative to the control according to the Dunnett's test (Table 5).…”

“…Another measure of P sorption capacity (P sorb75 ) was also calculated as the amount of P sorbed from a single addition of 75 mg P L -1 solution, which is equivalent tõ 0.7 × 10 -4 M. This single point sorption index has been used extensively in the literature to explain P sorption (Bache and Williams 1971;Mozaffari and Sims 1994;Beauchemin and Simard 1999;Zhou and Li 2001). Recently, the degree of P saturation (DPS) of calcareous Manitoba soils was reported to be best quantified as a ratio of Mehlich-3 extractable P (P M3 ) (Mehlich 1984), expressed in mmol kg -1 soil, to P sorption capacity calculated as the sum of Mehlich-3 extractable Ca and Mg (Ca M3 + Mg M3 ), also expressed in mmol kg -1 soil (Ige et al 2005b For personal use only.…”

“…Ammonium oxalate extractable Al, Fe, Ca and P (Al ox , Fe ox , Ca ox , and P ox ) were determined according to the method of (Jackson et al 1986) and analyzed by inductively coupled plasma optical emission spectrometry (ICP-OES). Phosphorus saturation index calculated as the ratio of P ox to the (Al ox + Fe ox ) was not calculated since P sorption in calcareous Manitoba soils has been shown to be uncorrelated with these chemical properties (Ige et al 2005b). The exchangeable Ca and Mg (Ca x and Mg x ) and the cation exchange capacity (CEC) of the soil were determined using the ammonium acetate method (McKeague 1978).…”

Contribution of Régis R. Simard to phosphorus research in agroecosystems and future prospects

“…The DPS was mimicked by the Mehlich-III P saturation ratio (Khiari et al 2000;Sims et al 2002;Pellerin et al 2006a, b). Using an approach similar to the Al-stratified Morgan P test in Vermont (Jokela et al 1998), Simard was successful in adapting the Mehlich-III soil test (Mehlich 1984) to a P:Al two-way classification for fertilizing perennial forage crops in Quebec (Conseil des Productions Ve´ge´tales du Que´bec Inc. 1996). In contrast with previous recommendations that were based on soil test P alone, more P was recommended for forages at the same P M-III level when soil Al fertility class was 1600 mg Al M-III kg…”

“…ratio concept could not be applied to the P management in calcareous soils due to the predominance of Ca and Mg (Ige et al 2005b). The M-III method (Tran and Simard 1993) was found to be sensitive to soil texture (Giroux and Tran 1985;Simard et al 1991;Zheng et al 2001;Ige et al 2005a) and lime additions (Samson 2008).…”