The Freundlich adsorption isotherm constants and prediction of phosphorus bioavailability as affected by different phosphorus sources in two Kansas soils

• Published in: Chemosphere (Oxford) Vol. 99; pp. 72 - 80
• Main Authors: Shafqat, Mustafa N., Pierzynski, Gary M.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.03.2014; Elsevier
• Subjects: Adsorption; Agronomy. Soil science and plant productions; Animal manure phosphorus; Animals; Biological and medical sciences; Biomass; Corn phosphorus uptake; Fertilizers - statistics & numerical data; Freundlich adsorption coefficients; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; Kansas; Manure; Models, Chemical; Nitrogen, phosphorus, potassium fertilizations; Other nutrients. Amendments. Solid and liquid wastes. Sludges and slurries; Phosphorus - analysis; Phosphorus - chemistry; Phosphorus fertilization; Soil - chemistry; Soil phosphorus bioavailability; Soil Pollutants - analysis; Soil Pollutants - chemistry; Soil-plant relationships. Soil fertility. Fertilization. Amendments; Swine; Zea mays - growth & development; Kansas; United States; North America; America; Freundlich adsorption coefficients; Animal manure phosphorus; Soil phosphorus bioavailability; Corn phosphorus uptake; Monocotyledones; Zea mays; Adsorption isotherm; Prediction; Corn; Phosphorus; Bioavailability; Organic fertilizer; Phosphorus fertilization; Cereal crop; Soils; Gramineae; Angiospermae; Freundlich isotherm; Cereal; Animal manure; Spermatophyta
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2013.10.009

•Freundlich constants were used for predicting corn growth parameters.•All P sources reduced levels of Freundlich K, increased 1/n and EPC0 in both soils.•Hog manure had smaller values of Freundlich K in the P deficient Eram-Lebo soil.•Corn biomass, tissue P and P uptake were increased by P sources in both soils.•Freundlich constants had relationships with agronomic parameters in low P soil. Phosphorus (P) adsorption onto soil constituents influences P bioavailability from both agronomic and environmental perspectives. In this study, the P availability from different P sources along with utility of Freundlich adsorption coefficients on the predictability of various crop growth parameters were assessed. Two soils were amended with 150mgPkg−1 each from six different P sources comprised of manures from two types of ruminants animals, three types of monogastric animals, and inorganic P fertilizer. Corn (Zea mays) was grown and harvested seven times under greenhouse conditions to remove P from the P amended treatments. The application of all P sources reduced the value of Freundlich K and increased the value of Freundlich 1/n and equilibrium P concentration (EPC0) in both soils compared to the un-amended control before cropping. The swine (Sus scrofa) manure (HM) resulted in significant smaller values of Freundlich K and larger values of 1/n in the P deficient Eram-Lebo soil compared to other P sources while, the opposite was true for the turkey (Meleagris gallopava) litter (TL) in the Ulysses soil. The corn biomass, tissue P concentration and P uptake were significantly influenced by all P sources during the first harvest and the total P uptake during seven harvests in both soils compared to the control treatment. Both Freundlich coefficients had strong relationships with the aforementioned corn parameters in the P deficient Eram-Lebo soil while, strength of the association was weak or missing in the Ulysses soil which had optimum levels of antecedent P.