twitter

Saturday, 11 June 2016

Fourteen years of evidence for positive effects of conservation agriculture and organic farming on soil life

Volume 35, Issue 1, 2014, Pages 169-181

 (Article)

a  IRD, UMR Eco&Sols (Montpellier SupAgro, CIRAD, INRA, IRD), 2 place Pierre Viala, Montpellier Cedex 2, France
b  INRA, UR251 PESSAC, Versailles Cedex, France
c  ELISOL Environnement, Campus la Gaillarde, 2 place Viala, Montpellier Cedex 2, France 

Abstract

Conventional agriculture strongly alters soil quality due to industrial practices that often have negative effects on soil life. Alternative systems such as conservation agriculture and organic farming could restore better conditions for soil organisms. Improving soil life should in turn improve soil quality and farming sustainability. Here, we have compared for the first time the long-term effects of conservation agriculture, organic farming, and conventional agriculture on major soil organisms such as microbes, nematofauna, and macrofauna. We have also analyzed functional groups. Soils were sampled at the 14-year-old experimental site of La Cage, near Versailles, France. The microbial community was analyzed using molecular biology techniques. Nematofauna and macrofauna were analyzed and classified into functional groups. Our results show that both conservation and organic systems increased the abundance and biomass of all soil organisms, except predaceous nematodes. For example, macrofauna increased from 100 to 2,500 %, nematodes from 100 to 700 %, and microorganisms from 30 to 70 %. Conservation agriculture showed a higher overall improvement than organic farming. Conservation agriculture increased the number of many organisms such as bacteria, fungi, anecic earthworms, and phytophagous and rhizophagous arthropods. Organic farming improved mainly the bacterial pathway of the soil food web and endogeic and anecic earthworms. Overall, our study shows that long-term, no-tillage, and cover crops are better for soil biota than periodic legume green manures, pesticides, and mineral fertilizers. © 2014, INRA and Springer-Verlag France.

Author keywords

Agricultural sustainability; Agroecology; Agroecosystems; Functional groups; Land management; Soil biodiversity; Soil food web; Soil functioning; Soil quality

Indexed keywords

GEOBASE Subject Index: abundance; agricultural ecosystem; alternative agriculture; biomass; food web; functional group; land management; molecular analysis; new record; organic farming; soil microorganism; soil quality; soil test
Regional Index: France; Ile de France; Versailles; Yvelines
Species Index: Arthropoda; Bacteria (microorganisms); Fungi; Nematoda
ISSN: 17740746Source Type: Journal Original language: English
DOI: 10.1007/s13593-014-0215-8Document Type: Article
Publisher: Springer-Verlag France

  Blanchart, E.; IRD, UMR Eco&Sols (Montpellier SupAgro, CIRAD, INRA, IRD), 2 place Pierre Viala, France
© Copyright 2015 Elsevier B.V., All rights reserved.