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Abstract
The aim of this study was to evaluate the potency of a biofertilizer (CPVS-NP) containing nitrogen (N) fixing and phosphorus (P) solubilizing purple nonsulfur bacteria (PNSB), Rhodopseudomonas palustris TLS06, VNW02, VNW64 and VNS89, on growth and biomass of the malabar spinach. The experiment was designed as a completely randomized block with five treatments and four replications, each of which corresponded to a pot. Particularly, the treatments were (i) 100% fertilization of N and P as recommendation dose, (ii) 75% fertilization of N and P combined with CPVS-NP, (iii) 50% fertilization of N and P combined with CPVS-NP, (iv) only fertilization of CPVS-NP, no chemical fertilizer, (v) no CPVS-NP and no chemical fertilizer. In the results, although supplying the CPVS-NP containing N-fixing and inorganic P-solubilizing bacteria, R. palustris TLS06, VNW02, VNW64 and VNS89 with only 75% fertilization dose of N and P still maintained growth parameters, including leaf length and root length, corresponding to 10.0 and 22.7 cm, increased leaves width (22.0 compared to 20.5 cm, respectively) at 30 days after sowing, in comparison with the treatment with 100% fertilization of N and P as recommendation dose (10.4 and 23.6 cm), plant height, fresh and dry biomass of the malaba spinach has not benefited from the bacteria.