mproving seed production of Sweet lupin, Lupinus albus .2 .- role of bradyrhizobium inoculation, nitrogen fertilization and plant density in maximizing productivity of White Sweet lupin in old clay loam soil

abonos nitrogenados bradyrhizobium caracteres de rendimiento clay soils composante de rendement engrais azoté inoculación inoculation loam soils lupinus albus nitrogen fertilizers plant population población vegetal population végétale seed semence semillas sol argileux sol sablolimoneux suelo arcilloso suelo franco yield components