Abstract

Wheat is among the crops that are affected by increasing drought and water scarcity,and deficit irrigation (DI) is considered to be an effective strategy to stabilize yieldsunder limited water availability. To support on-farm DI management, methods based onsoil water balance and canopy temperature measurements have been suggested to bereliable for field application. A preliminary experiment was set at CIHEAM-IAMB toevaluate the effect of different water regimes on two durum wheat varieties. In ourexperiment, under full irrigation (FI) the crop was kept quite constantly under unstressedconditions, while under DI (supported with 50% of corresponding FI supplies)and rainfed regimes, moderate water stress started respectively during the 'early grainfilling' and the 'booting to heading' stages, subsequently increasing until the end of thecropping season. Grain yield reached 4.4 t/ha under FI, while it was reduced by only14% in the case of DI treatment (3.8 t/ha) but with a corresponding potential watersaving of about 44% (from 281 mm to 159 mm of total irrigation supplies). On the otherside, DI increased yield of about 43% with respect to rainfed production (2.6 t/ha). The'biomass water use efficiency' (WUEb) decreased moving from rainfed (3.51) to FItreatment (2.42), and similarly the 'yield water use efficiency' (WUEy) increased movingfrom FI (1.19) to DI (1.32) and to rainfed treatment (1.47). Midday canopy temperature(Tc) was remotely measured at plot scale by means of a thermal camera and thecorresponding 'empirical' CWSI was computed. The CWSI followed the same dailytrend for the two varieties and it appeared to be a good indicator of plant water stressas it was ranging between 0-0.1 under non-stressed conditions, while it increasedsteadily after the imposition of water stress, first for rainfed (at booting stage) and afterfor DI (at early filling stage), reaching values of 0.7-0.9 at the end of the season. Acomparison of the 'measured' CWSI with the 'simulated' Ks has been done under thedifferent water regimes, and the modification of some selected crop parametersresulted in the improvement of model simulations.

Autore Pugliese

• Cantore Vito

Tutti gli autori

• V. Buono; Y. Georges; V. Cantore; A. Arslan;M. Todorovic

Titolo volume/Rivista

Non Disponibile

Anno di pubblicazione

2014

ISSN

Non Disponibile

ISBN

2-85352-536-8

Numero di citazioni Wos

Nessuna citazione

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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