The effect of application using nitragin and nitroxin biofertilizers on reduce the use of nitrogen chemical fertilizer in sunflower cultivation (Helianthus annuus L.)

For the aim of sustainable agriculture and reduce the use of chemical fertilizers, the experiment carried out by using of nitroxin and nitragin biofertilizers and chemical fertilizer of urea on yield and yield components of sunflower. This experiment was conducted in a farm located at 8 km distance of south west of Khoy city, northwest of Iran, in 2016. The experiments carried out using factorial design based on Randomized Complete Block design with three replications and two factors. The factors were as follows: The first factor consumption method of Nitragin biofertilizer in three levels (Control, seed inoculation and consumption along with irrigation) and Second factor nitrogen fertilizer in four levels (Control, Nitroxin biofertilizer with 100 kg chemical fertilizer of urea per hectare, Nitroxin biofertilizer with 150 kg chemical fertilizer of urea per hectare, 200 kg chemical fertilizer of urea per hectare).The results showed that consumption method of Nitragin biofertilizer on steam diameter, head diameter, Number of seed per head, 1000-seed weight and seed yield was significant. The maximum seed yield at rate of 3172.7 kg.ha was obtained from experimental treatments of Nitragin consumption along with irrigation. The effect of nitrogen fertilizer on plant height, steam diameter, head diameter, Number of seed per head, 100-seed weight, seed yield and seed oil percentage were significant. The maximum seed yield 3277.6 and 3206.4 kg.ha was obtained from experimental treatments 200 kg chemical fertilizer of urea per hectare and Nitroxin biofertilizer together urea at rate of 150 kg.ha respectively. According to the results of this experiment, using Nitroxin biofertilizer could reduce 25% urea chemical fertilizer consumption.