The role of Ca-organic interactions in soil aggregate stability, 2. Field studies with 14C-labelled straw, CaCO2 and CaSO4.2H2O [gypsum].
1989
Muneer M. | Oades J.M.
Uniformly 14C-labelled straw with or without CaCO3 or CaSO2.2H2O (gypsum) was incubated in a leached, fine sandy loam in the field. The addition of both Ca salts increased the residual 14C in the soil after several months decomposition, gypsum being more effective than CaCO3 in this respect. Addition of the Ca salts decreased the amount of dispersible clay and increased the proportion of particles 50-250 microm. diameter. The addition of 14C-labelled wheat straw (with or without gypsum or CaCO3) increased the stability of aggregates greater than 2000 microm. diameter. Addition of Ca during decomposition of straw resulted in a synergistic stabilization of aggregates greater than 1 mm. Moreover, the stabilization was prolonged in the presence of Ca.
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