[Modality of water's distribution in autumn and spring sown sugar beet with different nitrogen fertilizations and plant densities [in Campania and Apulia]]

apulia arrosage barbabietola da zucchero bilan de l'eau dans le sol bilancio idrico del suolo calendario de los riegos calendrier des irrigations campania campanie cantidad de semilla requerida concimi azotati date de semis essai fecha de siembra fertilisation fertilizantes nitrogenados fertilizer application irrigation scheduling nitrogen fertilizers plant production pouilles produzione vegetale programma di irrigazione prove pruebas puglia regadura remolacha azucarera seeding rates soil water balance sowing date sugar beet trials watering