Resumen

MATUS, F.J; RETAMALES, J.B  y  SANCHEZ, P. Effect of Particle Size and Quality of Pruning Wood Residues of Asian Pear (Pyrus pyrifolia and Pyrus communis) On C-And N-Mineralisation in Soils of Contrasting Textures . R.C. Suelo Nutr. Veg. [online]. 2006, vol.6, n.1, pp.1-8. ISSN 0718-2791.  http://dx.doi.org/10.4067/S0718-27912006000100002.

A laboratory incubation study (22 oC ± 2 ºC) with pruning residues of Asian pear ( P. pyrifolia, cv. Hosui) was carried out to determine the effects of residue particle size (<0.5 mm, 0.5-2 mm and 2-4 mm), residue quality (defined as C-to-N ratio, and total fibre content of each size class) and soil texture on C- and N-mineralisation in two Chilean soils. Particle size had a significat impact on C-mineralisation; however, no differences were observed for N-mineralisation. After 10 days of incubation, particles <0.5 mm evolved more C-CO₂ than medium (0.5-2 mm) and coarse particles. Thereafter, no significant (P <0.05) differences were observed for the smaller particles, while coarse sizes showed low C-CO₂ evolution during the all incubation period, except at the last sampling where C-CO₂ tended to be similar than <0.5 and 2-4 mm particles. The higher C-CO₂ evolved from the smallest particles coincided with their low C-to-N ratio and low fibre content. There was no effect of soil texture on C and N-mineralisation. These results were explained on the basis of residue quality rather than soil type.

Palabras clave : Residue particle size; pear pruning residues; C and N mineralisation rates.

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