Cotta, S. R.
Dias, A. C. F.
Carvalho, J. L. N.
Andreote, F. D.
Total Authors: 5
 Univ Sao Paulo, Luiz de Queiroz Coll Agr, Dept Soil Sci, BR-13400970 Piracicaba, SP - Brazil
 Univ Sao Paulo, Ctr Nucl Energy Agr, Piracicaba, SP - Brazil
 Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Biorenewables Natl Lab LNBR, Campinas, SP - Brazil
Total Affiliations: 3
Letters in Applied Microbiology;
Web of Science Citations:
Sugarcane cultivation supports Brazil as one of the largest world sugar and ethanol producer. In order to understand the impact of changing sugarcane harvest from manual to mechanized harvest, we studied the effect of machinery traffic on soil and consequently soil compaction upon soil microbial communities involved in nitrogen cycling. The impact of sugarcane harvest was dependent on soil depth and texture. At deeper soil layers, mechanized harvesting increases the abundance of nitrogen fixers and denitrifying communities (specificallynosZ clade I and II) while manual harvesting increases the abundance of ammonia oxidizers (specifically AOA) and increases denitrifying communities (nosZ clade I and II) on top and at intermediate depth. The effect of change on the harvest system is more evident on sandy soil than on clay soil, where soil indicators of compaction (bulk density and penetration resistance) were negatively correlated with soil microorganisms associated with the nitrogen cycle. Our results point to connections between soil compaction and N transformations in sugarcane fields, besides naming biological variables to be used as proxies for alterations in soil structure. (AU)