Prices of mineral fertilizers are getting higher nowadays, so that this
experiment was designed. In a private farm in the New Vally governorate,
different fertilizer combinations; organic, bio and mineral sources were used
in this study to grow potato (Cara cv.) in sand soil in the two following
winters of the years 2019/2020 and 2020/2021. Results showed that
inoculating potato plants with Biofert (as N-fixing bacteria) in the presence
of organic manures ―half of the recommended doses‖ (as FYM + PM) gave
the highest mean values of all studied growth and yield characters. When
compared to plants grown with the control treatment, potato plants treated
with FYM + PM + Biofert + 100% NPK dosage had the greatest mean
values for those features. The increased amount of soluble nutritional
components in mineral fertilization made it more impactive than organic
manures or biofertilization in terms of improving soil fertility. The yield and
quality indicators of potato tubers increased as a result of this impact. From
the obtained results, it could be recommended that inoculating potato plants
with the Biofert (as N-fixing bacteria) and Biopotass (as K-solubilizing
bacteria) combined with compost (FYM) + (PM) and 75% of the
recommended doses of mineral fertilization (NPK) is the best for potato
production to get the highest economic yield of potato with the best qualities
of marketable tubers.