Effect of different treatments with crop residues on soil phosphatase activity |
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| Authors: | P Perucci L Scarponi |
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| Institution: | (1) Istituto Chimica Agraria, Università degli Studi, Borgo XX Giugno, 72, 06100 Perugia, Italy |
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| Abstract: | Summary Phosphomonoesterase (both acid and alkaline) and phosphodiesterase activity was either activated or inhibited in a soil treated with different crop residues.  Phosphotriesterase activity remained unaffected. The kinetic parameters (V
max and K
m) of treated soil samples were modified in the same way: Increases or decreases in the V
max values corresponded to increases or decreases in the K
m values. The V
max values, rather than the K
m values, were found to have a predominant effect on phosphatase activity, thus indicating a fundamental role for the enzyme concentration. A positive and generally significant correlation was found between the activity of each phosphatase, which suggests an unspecific source of these enzymes. The values of the determination coefficients (R
2 × 100) show that a low percentage of the variability may be ascribed to interactions among phosphatase activities. |
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| Keywords: | Crop residues Phosphatase activity Kinetic parameters Enzyme correlations |
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