Agronomic performance,carbon storage and nitrogen utilisation of long-term organic and conventional stockless arable systems in Mediterranean area |
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| Institution: | 1. INRA, UR 1158 AgroImpact, Site de Laon, F-02000 Barenton-Bugny, France;2. INRA, UMR Agronomie, AgroParisTech, Université Paris-Saclay, F-78850 Thiverval-Grignon, France |
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| Abstract: | The Montepaldi Long Term Experiment (MOLTE) trial in central Italy has been comparing three agroecosystems with different management: two organic (Old Organic since 1992 and Young Organic since 2001) and one conventional. After sixteen years of comparison, the agronomic performance and environmental sustainability of the three agro-ecosystems were assessed. Crops grain yield, total C inputs and N budget at field level were evaluated. N use efficiency (NUE) at micro-agroecosystem level was determined. Soil samples were collected from the three agroecosystems in order to quantify soil C and N pools.Results showed comparable grain yields in the three agro-ecosystems. The conventional system showed a larger N surplus and a lower crop N use efficiency in comparison with the organic ones. Moreover, the organic systems presented a lower potential risk of N losses with respect to the conventional one. The Young Organic agro-ecosystem was the most effective in terms of long term soil C (13% higher than conventional) and the oldest organic agro-ecosystem was the most effective in terms of soil N storage (9% higher than conventional).The results obtained demonstrated that the application of the organic farming method could increase the environmental sustainability in stockless arable systems under Mediterranean type of climate. |
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| Keywords: | Organic farming Long term field experiment Nitrogen balance and efficiency Soil carbon sequestration |
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