[Nitrogen. Dose and date are no more enough any more [fertilizer application - Italy]]

abonos nitrogenados ammonium nitrate ammonium sulphate application date application rates calcium nitrate concimi azotati crop yield date d'application dose d'application dosi di applicazione environmental factors epoca di trattamento facteur du milieu factores ambientales fattori ambientali fertilisation fertilizer application field experimentation italia italie italy nitrate d'ammonium nitrate de calcium nitrato ammonico nitrato de amonio nitrato de calcio nitrato di calcio nitrogen fertilizers rendement des cultures rendimiento de cultivos solfato ammonico sulfate d'ammonium sulfato de amonio triticum aestivum urea uree