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Caroline C. MBA 《Environmental management》1994,18(2):257-261
Four microbial isolates, OP2, OP3, OP6, and OP7, of earthworm casts ofPontoscolex corethrurus were found to be acid tolerant actinomycetes and efficient rock phosphate (RP) solubilizers that could grow fast on NH4Cl-enriched or N-free carboxymethyl cellulose or glucose as sole carbon source.
CMC (carboxymethyl cellulose) induced production of extracellular cellulase enzyme and the production of reducing sugar in
all the isolates. RP solubilizing power was observed to be inversely related to glucose consumption. The most efficient RP
solubilizer was found to consume the least glucose.
Growth was faster on cellulose than on glucose media. N-free CMC induced greater glucose production than NH4Cl-enriched CMC medium. Both CMC and glucose media were acidified by all the isolates, however, RP solubilizing power decreased
with acidification. Solubilization power was greatest with isolate OP7, which also produced the greatest amount of reducing
sugar per gram CMC. Both RP solubilizing power and the cellulolytic efficiency varied among isolates. A minimum of 631 μg
P/0.1 g RP and a maximum of 951.4 μg P/0.1 g RP was recorded. 相似文献
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Caroline C. Mba 《Environmental management》1994,18(2):263-269
Recently biotechnology is focusing attention on utilization of biological resources to solve a number of environmental problems
such as soil fertility management. Results of microbial studies on earthworm compost in the University of Nigeria farm identified
a number of rock phosphate solubilizing actinomycetes. Two of these, isclates 02 and 13, were found to be efficient rock phosphate
(RP) solubilizers and fast-growing cellulolytic microbes producing extracellular hydrolase enzymes. In this preliminary field
study the two microbial isolates were investigated with respect to their effects on the growth of soybean and egusi as well
as their effect on the incidence of toxicity of poultry droppings. Application of these isolates in poultry manure-treated
field plots, as microbial fertilizers, brought about yield increases of 43% and 17% with soybeans and 19% and 33% with egusi,
respectively. Soil properties were also improved. With isolates 02 and 13, the soil available phosphorus increased at the
five-leaf stage, while N-fixation in the soil increased by 45% or 11% relative to control. It was further observed that air-dried
poultry manure after four days of incubation was still toxic to soybean. The toxic effect of the applied poultry manure was
reduced or eliminated with microbial fertilizers 02 or 13, respectively.
The beneficial effects of the microbial organic fertilizer are discussed. Justification for more intensive research on rock
phosphate organic fertilizer is highlighted. 相似文献
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