SOM depletion is one of the major factors causing degradation of
ecosystem services and loss of ecosystem resilience (Bronick and Lal,
2005; Lal, 2005; Feller et al., 2012). Thus numerous studies have
suggested that organic soil amendment is an alternative for sustaining
economically viable crop production with minimal environmental pollution.
Indeed, organic fertilization has been shown to improve SOM
content, microbial biomass and activity, to suppress plant diseases, especially
those caused by soil-borne pathogens, and to improve soil resistance
against erosion (Thiele-Bruhn et al., 2012). However, a major
limitation of organic amendment is its smaller impact on plant yield
than chemical fertilizers, although this difference is highly contextual
and depends on the system and site characteristics (Seufert et al.,
2012). In a literature review, Seufert et al. (2012) found that most studies
on organic amendments were carried out in developed countries
where performance is on average 20% less than with conventional agriculture,
and this difference reaches 43% in developing countries. Therefore,
more research is needed, especially in developing countries, to
improve our knowledge of the potential of organic amendments, as
well as to improve their effectiveness.
SOM depletion is one of the major factors causing degradation ofecosystem services and loss of ecosystem resilience (Bronick and Lal,2005; Lal, 2005; Feller et al., 2012). Thus numerous studies havesuggested that organic soil amendment is an alternative for sustainingeconomically viable crop production with minimal environmental pollution.Indeed, organic fertilization has been shown to improve SOMcontent, microbial biomass and activity, to suppress plant diseases, especiallythose caused by soil-borne pathogens, and to improve soil resistanceagainst erosion (Thiele-Bruhn et al., 2012). However, a majorlimitation of organic amendment is its smaller impact on plant yieldthan chemical fertilizers, although this difference is highly contextualand depends on the system and site characteristics (Seufert et al.,2012). In a literature review, Seufert et al. (2012) found that most studieson organic amendments were carried out in developed countrieswhere performance is on average 20% less than with conventional agriculture,and this difference reaches 43% in developing countries. Therefore,more research is needed, especially in developing countries, toimprove our knowledge of the potential of organic amendments, aswell as to improve their effectiveness.
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