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Phosphate sorption by Egyptian, Ethiopian and German soils and P uptake by rye ( Secale cereale L.) seedlings
Author(s) -
Soltan Soltan,
Römer Wilhelm,
Adgo Enyew,
Gerke Jörg,
Schilling Günther
Publication year - 1993
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19931560608
Subject(s) - sorption , secale , soil water , phosphate , chemistry , calcareous , calcareous soils , oxalate , environmental chemistry , nuclear chemistry , inorganic chemistry , botany , adsorption , geology , soil science , biology , biochemistry , organic chemistry
Phosphate sorption was studied in samples (0 ‐ 20 cm depth) of five soils from Egypt (pH 7.4 ‐ 8.7), four soils from Ethiopia (pH 3.9 ‐ 5.3) and six soils from Germany (pH 3.3 ‐ 7.2). Sorption parameters were calculated according to Pagel and Van Huay (1976) and according to Langmuir ( Syers et al., 1973). Phosphate sorption parameters and oxalate extractable Fe and Al (Fe ox , Al ox ) were related to the phosphate uptake by young rye plants in Neubauer pot experiments. P sorption parameter after Pagel and Van Huay (A) correlated significantly positively with the Fe ox and Al ox content in acid (r = 0.73) as well as in calcareous soils (r = 0.89) if the whole equilibrium concentration range (0 ‐ 14 mg P/L) was considered. The relations calculated after Langmuir (B) were similar. P uptake by rye in acid soils was negatively correlated with the affinity constant n (r = −0.76, (A)). In calcareous soils, a negative correlation between P uptake and affinity constant was calculated in the lower P equilibrium range (0 ‐ 2.8 mg P/L) only for (B). Thus, P uptake decreased with increasing strength of P bonding to soil. From these results it is concluded that phosphate sorbed to Fe/Al oxides is an important P source for plants in acid and calcareous soils.