Effects of organic versus conventional management on chemical and biological parameters in agricultural soils

Evaluation of Soil Health in Short Term Organic Vs Conventional Practices during Paddy Cultivation

“…Our study demonstrated that experimental site supplemented with green manure exhibited greater biological activity (i.e. soil enzymes activities) than the conventional amendment and similar observations have been preiously reported by (Mader et al, (2002), van Diepeningen et al, (2006, Melero et al, (2006) and Benitez et al, (2006). Dehydrogenase, as an indicator of oxidoreductase activity of soil micro-biota (Alef and Nannipieri, 1995), was found higher in organically managed soil.…”

Potato brown rot incidence and severity under different management and amendment regimes in different soil types

“…Similar to our previous results on survival of the pathogen, both density in bulk soil and disease incidence (proportion of wilted plants) were higher in organic than in conventional sandy and clay soils from the Netherlands. This may be related to the high availability of substrate in the Dutch soils, especially the organically-managed soils, where large quantities of manure have commonly been used (van Diepeningen et al 2006). Indeed, in this study the DOC content in soil was positively correlated with AU-DPC, and was higher in the organic than in the conventional Dutch sandy soil.…”

“…The bacterial diversity in the samples was estimated in two ways: as species richness S, and as the Shannon-Wiener index of bacterial diversity, H 0 as described previously (van Diepeningen et al 2006). …”

Biological Soil Disinfestation (BSD), a new control method for potato brown rot, caused by Ralstonia solanacearum race 3 biovar 2

“…After scanning, gels were analyzed with Phoretix 1D Advanced version 4.00 (NonLinear Dynamics Ltd., Newcastle upon Tyne, UK). The bacterial diversity in the samples was estimated in two ways: as species richness S, and as the Shannon-Wiener index of bacterial diversity, H (Eichner, Erb, Timmis, & Wagner-Dö bler, 1999;van Diepeningen, de Vos, Korthals, & van Bruggen, 2006).…”

“…The banding patterns were further analyzed with Principal Component Analysis (PCA) using the PRINCOMP procedure of SAS, version 9.1 (SAS Institute Inc., Cary, NC, USA) on log-transformed band intensities and with Discriminant Analyis (DA) using the DIS-CRIM, CANDISC, and STEPDICS procedures of SAS. For the DA, each data set was first split into small subgroups of five variables and the most discriminating variables were then combined and subjected to the final analyses (van Diepeningen et al, 2006). The banding patterns compared in one PCA or DA analysis were all from the same gel.…”