Considerations sur la fertilite des sols et fertilisation des cultures en Tunisie

abonos agronomia agronomie agronomy agrume alfalfa azote citrus fruits climatologia climatologie climatology cost benefit analysis crops cultivos engrais fertilidad del suelo fertilisation fertilizer application fertilizers fosforo lucerne luzerne nitrogen olea europaea phosphore phosphorus plante de culture potasio potassium recherche remolacha azucarera rendement rendimiento research soil fertility sugarbeet trial methods trigo wheats yields