1Dipartimento Agricoltura, Ambiente e Alimenti, Università degli Studi del Molise, Via De Sanctis, 86100 Campobasso, Italy.
2Istituto per la Protezione Sostenibile delle Piante (IPSP), Consiglio Nazionale delle Ricerche (CNR), via Madonna del Piano 10, I-50019 Firenze, Italy.
3Dipartimento di Bioscienze e Territorio, Università degli Studi del Molise, Contrada Fonte Lappone, 86090 Pesche, Italy.
The effects of nitrogen (N) addition on productive and physiological traits of Triticum dicoccum were assessed under two N levels (0, unfertilized, and 90 kg N ha−1) in field conditions, in two growing seasons. In the study case, the N supply (90 kg N ha−1) was applied in three-split applications (20% at pre-plant stage, 40% at tillering stage, 40% at stem elongation). In unfertilized conditions, the productive and physiological traits were consistently reduced in comparison with fertilized treatments. Indeed, control plots showed lower grain yield, biomass and protein content (about 42, 44 and 19%, respectively) and lower photosynthetic activity at light saturation level (25%) than fertilized plots. The stomatal conductance was 34.2% and 70.8% lower in unfertilized plots than in fertilized those, in the first and second year, respectively. No significant differences for the Ci/Ca ratio were evident between treatments. Emmer physiological and yield performances were affected by N supply, although the crop plasticity to N availability was emphasized.