Efficacy evaluation of farm inputs on soil biodiversity

Xuan, T.H.; Nazar, J.S.; Corales, R.G.; Tadeo, B.D. . Central Experiment Station

Efficacy evaluation of farm inputs on soil biodiversity

2003

Xuan, T.H. | Nazar, J.S. | Corales, R.G. | Tadeo, B.D. (Philippine Rice Research Inst., Maligaya, Munoz, Nueva Ecija (Philippines). Central Experiment Station)

Bacillus pumilus and B. macerans had antifungal and bactericidal activities that can inhibit the growth of Xanthomonas oryzae (causing bacterial leaf blight), Fusarium moniliforme (Bakanae), and X. campestris (causing bacterial leaf streak), and can enhance root formation. Paenibacillus polymyxa and Pseudomonas stutziri are also root growth promoters. Other species that can enhance composting are Azotobacter, Pantoea ananas, Anthrobacter histidinolovoran, and Enterobacter cloacae, Their expected role in non-legume nitrogen fixation will be evaluated. Yeast can provide vitamins, thus, it was also added to the formulation. The efficacy of the microorganisms as tested against X. oryzae pv. oryzae (Xoo) using the bio-assay technique. Isolates of Actinomycetes and B. macerans effectively inhibited the growth of Xoo after 3-5 days of incubation. Bacillus species, which are widely known to be the most useful of all isolates, were observed to be the most prevalent during the WS [wet season]: B. pumilus, B. macerans, Actinomycetes sp., P. polymyxa, P. ananas and Klebsiella pnuemoniae. The study determined the impact of using microbial inoculants as good source of indigenous microorganisms that can give beneficial effects to the rice rhizosphere as well as to the environment. The least number of bacterial species and lowest colony count were observed in the plots applied with commercial fertilizers. Beneficial organisms were adversely affected. EM [effective microorganisms] technology + commercial fertilizer gave the highest beneficial species and colony count as well

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