Irrigation and nitrogen fertilization treatments on productive and qualitative traits of broad bean (Vicia fabavar.minorL.) in a Mediterranean environment
Legume Research An International Journal
Broad bean (Vicia faba var. minor L.) is a legume crop cultivated in the Mediterranean area for animal feeding and green manure purposes. The crop has an important role on the sustainability of the cropping systems for its ability to fix nitrogen and for the effects on soil structure, weed competition, nitrate leaching and pest control. This research, carried out in Central Italy, investigated the effect of the irrigation and nitrogen fertilization on productive traits of broad bean (biomass,
... ad bean (biomass, seed yield, seed weight, harvest index, protein yield), seed chemical composition (nitrogen, phosphorus, potassium, trypsin inhibitors, tannin polyphenols, total polyphenols), water and nitrogen budgets (ETc, WUE, plant N content, N fixed, soil N uptake). The yearly variability was the factor that greatly influenced the crop performances in term of total biomass (13.6 t ha -1 , on average), yield (3.53 t ha -1 , on average) and protein yield (841 kg ha -1 , on average). Evapotranspiration was affected by the water availability (rainfall and irrigation), and water use efficiency for the biomass (31.68 g kg -1 , on average) and yield (8.36 g kg -1 , on average) were quite stable among water and nitrogen treatments. Anti-nutritional factors in the seed remained similar for all experimental treatments and below the threshold levels for animal feeding purposes.