Association of common cultural practices, disease severity, and barley grain yield in Tunisia
2004
Rezgui, S. | Dahdouh, N. (Ecole Superieure d'Agriculture de Mograne, Zaghouan (Tunisia)) | Yahyaoui, A. (International Center for Agricultural Research in the Dry Areas, Aleppo (Syria))
Associations between farmers common cultural practices that include fertilizers, fungicides, seed source and seeding rate were investigated. Disease severity and grain yield were assessed based on survey data of treated (69%) and untreated barley fields (31%). Nitrogen and Phosphorus applications were positively correlated with disease severity (r=0.73 and r= 0.79 respectively) in the treated fields; whereas greater associations were noted in untreated fields (r=0.87 and r=0.82). Although, disease severity affected grain yield in both treated and untreated fields (r=-0.79 and r=-0.87, respectively), it is apparent that fungicide application reduced the disease impact. Hence an average grain yield of 2.7 t/ha was obtained in treated fields whereas only 1.8 t/ha was obtained in untreated fields where average disease severity reached 0.85. High seeding rates and local seed sources were commonly used in the untreated fields and favored disease development and therefore limited yield potential. Fungicide treatment reduced disease severity (0.33) and yield increase of about 0.5 t/ha was observed in association with fertilizer application. The economic return of the association of cultural practices, disease severity, and grain yield should be considered for further investigation
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