Development of multifunctional biofertilizer formulation from indigenous microorganisms and evaluation of their N2-fixing capabilities on Chinese cabbage using 15N tracer technique
2012
Abdul Wahid, A. N | Phua, C. K. H. | Abdul Rahim, K.
Biofertilizer is an alternative to chemical fertilizers to increase soil fertility and crop production in sustainable farming. Most biofertilizer products consist of a single function micro-organism such as N2 fixing bacteria. This paper discusses the development ofmultifunctional biofertilizer products, based on indigenous micro-organisms that have all the desired characteristics, including plant growth promoting, phosphate solubilising and antagonistic towards pathogens, and optimisation of the micro-organisms present in themodified “Natural Farming” compost. Composting through the “Natural Farming” method is a simple and cheap method to turn empty fruit bunches (EFB) of oil palm into compost. Indigenous micro-organisms in each stage of composting were isolated and screened for theabilities to solubilise phosphate and produce indole-3-acetic acid (IAA). These indigenous micro-organisms were developed into biofertilizer products. Effects of these products on plant growth of Chinese cabbage and contribution of N2 to the plants were evaluatedusing the 15 N isotopic tracer technique in a greenhouse trial. Fertilizer treatment using a combination of microbial strains (T7) was found to significantly enhance the growth of Chinese cabbage. All the plants receiving biofertilizer microorganisms showed N2-fixing effects as compared to the control (T9). The isolated indigenous micro-organisms may enhance plant growth through N2fixation, solubilising insoluble inorganic phosphate compounds or hydrolyse organic phosphate to inorganic P or stimulation of plant growth through hormonal action such as produce IAA. Combination of microbial strains could be a good multifunctional biofertilizer for sustainable agriculture.
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