Data di Pubblicazione:
2014
Citazione:
Alternative water management in temperate rice: yields and environmental implications / E.F. Miniotti, D. Said-Pullicino, D. Sacco, A. Facchi, S. Pelissetti, E.A. Chiaradia, C. Bertora, S. Cesari de Maria, D. Tenni, L. Celi, M. Romani - In: 4. International rice congress[s.l] : Irri, 2014 Oct. (( Intervento presentato al 4. convegno International Rice Congress tenutosi a Bangkok nel 2014.
Abstract:
Purpose:
Alternative water management practices adopted in temperate rice paddies may strongly influence redox-driven changes in rice paddies with important implications on nutrient availability and nitrogen use efficiency (NUE), greenhouse gas (GHG) emissions and water quality, water balance, as well as crop yields. We evaluated three water management practices for all these aspects through a two-year (2012-13) field experiment carried out in Castello d'Agogna (Pavia, NW Italy).
Approach and methods used:
Three water management practices were compared: (i) water seeding and submerged conditions (FLD); (ii) dry seeding and flooding delayed by about 40 days (DRY); (iii) dry seeding and rotational irrigation (IRR). During the cropping seasons, water balance terms were monitored, surface and subsurface water samples were collected and analyzed for inorganic N, while methane and nitrous oxide emissions were measured in situ by the closed-chamber technique. For each treatment we
also evaluated grain yield, yield components and NUE of 4 rice varieties.
Key results:
Higher grain yields were obtained for FLD and DRY treatments, while IRR showed lower production for all 4 varieties evaluated (15-25% less). Although we did not observe any significant difference between treatments in 2012, NUE decreased in the order FLD>DRY>IRR in 2013. Soil water analyses evidenced an increase in ammonium-N in correspondence with pre-seeding and tillering stage N fertilization events, particularly for DRY and IRR. Moreover, whereas limited nitrification in FLD resulted in lowest nitrate concentrations, DRY and IRR showed important nitrate
concentrations and leaching along the soil profile. Differences in soil redox conditions between treatments influenced GHG emissions, in the order IRR≤
Tipologia IRIS:
03 - Contributo in volume
Elenco autori:
E.F. Miniotti, D. Said-Pullicino, D. Sacco, A. Facchi, S. Pelissetti, E.A. Chiaradia, C. Bertora, S. Cesari de Maria, D. Tenni, L. Celi, M. Romani
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Titolo del libro:
4. International rice congress