effect of nitrogen biofertilizers with urea fertilizer on some quantitve and qualitive traits of potato var. marphona

chemical fertilizers are threat in hman life and today application of biological fertilizer find more important. this study performed in order to evaluate the effects application of biofertilizers with urea fertilizer on yield, protein percentage and numbers of eyes in plant, plant height and chlorophyll spad in potato var. marphona. a factorial experiment was conducted based on randomized complete block design with four replications. the traits were consist of nitragin biofertilizer in two application levels and not application (application with seed), hb-101 biofertilizer in complete organic soluble (whit three levels of application, control, one spray application and tow spray applications) and urea fertilizer in tow levels (application and not application). the results showed that highest tubre yield (46526 kg). heigth plant (70.2 cm) and chlorophyll spad (55.2) were founded in nitragin biofertilizer with urea fertilizer and tow application of hb-101 treatment. also highest protein percentage and lowest number of eyes in tubre were founded in application of nitragin biofertilizer with urea fertilizer and two applications of hb-101. in final, the results showed that inoculation of biofertilizer with chemical fertilizer increased yield and quality of potato.