Abstract
The responses of dry mass accumulation, NPK uptake, water use efficiency, and green pods yield characters of snap bean plants to biofertilizer Halex-2 under four varying humic acid (HA) rates; 0 (HA(0)), 0.3 (HA(1)), 0.6 (HA(2)) and 1.2 (HA(3)) ton ha(-1), were studied. Two field experiments were conducted, during the season of 2011 and 2012, at the Agricultural Experiment Stations, Hada-Alsham, King Abdulaziz University, Saudi Arabia. Increasing HA rate up to 1.0 t ha(-1) (HA(2)) led to significant increments in the dry mass accumulation, uptake of N, P and K, green pods yield, the number of pods and water use efficiency characters. Moreover, the results showed that inoculation of snap bean seeds by biofertilizer Halex-2 significantly increased all studied parameters of snap bean plants. Generally, the combination treatment of 1.0 t HA ha(-1) + Halex-2 was the most beneficial treatment which gave significantly higher mean value for total green pods yield ha(-1), number of pods plant(-1) and water use efficiency.