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- W765654185 abstract "Phosphate (P) adsorption of 6 agriculturallyimportant Arizona soils was studied by use of adsorption isotherm experiments and with conventional Langmuir and Freundlich adsorption models. Adsorption experiments were conducted at 25 °C where each soil was placed in a 10:1 (solution:soil) ratio using 0.01M CaCl2 as a background solution. Each soil was subjected to 4 levels of inorganic P addition using Ca(H2PO4)2H2O as the P source. Use of the Langmuir model was significant in all cases (P < 0.05) with r2 values ranging from 0.93 to 0.99. Capacity parameter estimates obtained from the models indicated P adsorption potentials of up to 357 lb. acre' (818 lb. P205 acre') for the soils studied. Application of the Freundlich model revealed ? values of 0.88 to 0.99 with all models proving to be significant (P < 0.05). INTRODUCTION Several adsorption models, such as the Langmuir and Freundlich models, have been used to describe phosphate (P) adsorption of many soils. The use of such models began in the 1950s (Fried and Shapiro, 1956; Olsen and Watanabe, 1957), and has continued in recent years (Mead, 1981; and Polyzopoulos et al., 1985). Limitations in the use and interpretation of adsorption models with soil systems have been well recognized and demonstrated (Veith and Sposito; 1977; Harter and Smith, 1981; and Sposito, 1982). Application of P adsorption data to those types of models does, however, allow for relative comparisons of determined parameters among soils of interest. Soils in Arizona that have been developed for agricultural purposes, such as cotton production, arc typically high pH and highly calcareous in nature. A basic characterization of the P adsorption tendencies of many of the soils would be of interest in developing a better understanding of the behavior of added P. That is of particular interest in developing P fertilization strategies of major crops, such as cotton, which very seldom show any response to P fertilization (Tucker et al., 1965; Farr, 1971; Openshaw and Page, 1972; and Abbott, 1974). It is even true when soil -test results indicate a possibility of response to P fertilization and high rates of P fertilizer are applied. The data presented here represent part of an initial step to develop a characterization of P sorption by several agriculturally important soils of Arizona. MATERIALS AND METHODS Surface (0 -8 in.) soil samples from 6 agriculturally important soils of Arizona were collected for use in the study (Table 1). Pertinent chemical properties of each soil were determined (Table 2). All soils were air dried and ground to pass a 2mm sieve. Sorption data for the 6 soils were obtained by shaking 3g samples of each soil in 30m1 of 0.01 M CaC12 solutions containing various concentrations of phosphate as Ca(H2PO4)2 H2O, for seven days at 25 ° C. Equilibrium P concentrations were determined by use of a modified Murphy and Riley colorimetric method (Olsen and Sommers, 1982). The amount of P sorbed was calculated by subtracting the final equilibrium P concentration from that of the initial P concentrations." @default.
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- W765654185 date "1989-03-01" @default.
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- W765654185 title "Phosphate Sorption of Several Arizona Soils" @default.
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