This field study was carried out, during fall seasons of 2002 and 2003, to
uate the effect of chemical fertilizer (Sangral) and biofertilizer (Nitrobien) in
erent ratio (0/0, 100/0, 7S/2S, SO/SO, 2SnS and 01100% of Sangral and Nitrobien,
ectively) on the growth, the yield and the chemical composition of potatoes.
-~ults showed that nitrogen application increased vegetative growth and yield of
tubers. The addition of 2S% of Nitrobien to 7S% of the chemical fertilizer resulted
e highest values of growth parameters and yield as compared with all other
::a1ments. Chlorophyll, N, P and K in leaves and total carbohydrate concentration in
rs were also increased by the addition of 2S% of Nitrobien to the chemical
cer. This study indicated that the application of 25% of Nitrobien with 7S% of
ral in mixed form is the best treatment for potato growth and production in arid
semi-arid regions.