Chemical and biochemical properties in a silty loam soil under conventional and organic management

To improve soil fertility, efforts need to be made to increase soil organic matter content. Conventional farming practice generally leads to a reduction of soil organic matter. This study compared inorganic and organic fertilisers in a crop rotation system over two cultivation cycles: first crop broad bean (Vicia faba L.) and second crop mixed cropped melon-water melon (Cucumis melo-Citrullus vulgaris) under semi-arid conditions. Total organic carbon (TOC), Kjeldahl-N, available-P, microbial biomass C (Cmic), and N (Nmic), soil respiration and enzymatic activities (protease, urease, and alkaline phosphatase) were determined in soils between the fourth and sixth year of management comparison. The metabolic quotient (qCO2), the Cmic/Nmic ratio, and the Cmic/TOC ratio were also calculated. Organic management resulted in significant increases in TOC and Kjeldahl-N, available-P, soil respiration, microbial biomass, and enzymatic activities compared with those found under conventional management. Crop yield was greater from organic than conventional fertilizer. The qCO2 showed a progressive increase for both treatments during the study, although qCO2 was greater with conventional than organic fertilizer. In both treatments, an increase in the Cmic/Nmic ratio from first to second crop cycle was observed, indicating a change in the microbial populations. Biochemical properties were positively correlated (p < 0.01) with TOC and nutrient content. These results indicated that organic management positively affected soil organic matter content, thus improving soil quality and productivity.

Bibliographic Details

Main Authors:	Melero Sánchez, Sebastiana, Ruiz Porras, J. C., Herencia, Juan F., Madejón, Engracia
Other Authors:	European Commission
Format:	artículo biblioteca
Language:	English
Published:	Elsevier 2006
Online Access:	http://hdl.handle.net/10261/64552 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100006280 http://dx.doi.org/10.13039/501100011011
Tags:	Add Tag No Tags, Be the first to tag this record!