Available phosphate content of an alluvial soil as influenced by inoculation of some isolated phosphate-solubilizing micro-organisms

1982 ◽  
Vol 69 (3) ◽  
pp. 353-364 ◽  
Author(s):  
S. Banik ◽  
B. K. Dey
Keyword(s):  
Alluvial Soil ◽  
Phosphate Content ◽  
Phosphate Solubilizing ◽  
Micro Organisms ◽  
Available Phosphate

The Azotobacter Test of Soil Fertility Applied to the Classical Fields at Rothamsted.

1932 ◽  
Vol 22 (4) ◽  
pp. 797-810 ◽  
Author(s):  
Jadwiga Ziemięcka
Keyword(s):  
Calcium Carbonate ◽  
Soil Fertility ◽  
Soil Samples ◽  
Mineral Nitrogen ◽  
Nitrogen Compounds ◽  
Phosphate Content ◽  
Plate Test ◽  
Classical Fields ◽  
Available Phosphate

Summary and abstract1. The kneaded plate (plaque moulée) method of detecting deficiency in lime and available phosphate was applied to seventy-nine soil samples taken from the classical Rothamsted arable plots, and the Azotobacter population from some of these samples was estimated by counts on silica jelly.2. The silica jelly counts showed that Azotobacter cells were very much reduced in number, or even absent in soil receiving 86 lb. per acre or more of mineral nitrogen. It is suggested that this is due to competition with other organisms whose growth is stimulated by added nitrogen compounds.3. The kneaded-plate test correctly indicaṫed whether phosphate had been applied in soils receiving little or no nitrogen manures.4. In those soils receiving 86 lb. or more of mineral nitrogen, the kneaded-plate test usually showed little or no Azotobacter growth even in the presence of phosphate and calcium carbonate. This failure was probably due to the paucity of Azotobacter cells originally present in such soil samples. In some cases the test was modified by inoculating the sample with a culture of Azotobacter and it then gave correct indications as to phosphate content.

scholarly journals Isolation of phosphate-solubilizing rhizosphere fungi from jabon merah (Neolamarckia macrophylla) stand of Sidrap Provenance, South Sulawesi

2021 ◽  
Vol 886 (1) ◽  
pp. 012014
Author(s):  
S W Jufri ◽  
I Rahim ◽  
A Arif ◽  
M Restu ◽  
I Iswanto ◽  
...  
Keyword(s):  
Standard Method ◽  
Point Method ◽  
Soil Minerals ◽  
Ability Test ◽  
Rhizosphere Fungi ◽  
South Sulawesi ◽  
Macro Element ◽  
Phosphate Solubilizing ◽  
Available Phosphate ◽  
Rhizosphere Fungus

Abstract Phosphate is an essential macro element that has a necessary function as a constituent of ATP and DNA in plants. However, the availability of dissolved phosphate in the soil is minimal because it tends to bind with soil minerals to form phosphate complexes. With rhizosphere fungi, the low available phosphate in the soil can be overcome. This study aimed to determine the character and potential of fungi capable of dissolving phosphate. The source of the isolates used was a collection of rhizosphere fungus isolates under the red jabon stand. Purification was carried out using the point method on PDA media. The phosphate dissolving ability test was done using the standard method using liquid pikovskaya media and then analyzed descriptively and quantitatively. Eighteen rhizosphere fungus isolates were observed, two of which could dissolve phosphate, respectively, obtained from isolates JCS16 with a concentration value of 10.48 ppm, JCS 13 with a concentration value of 10.06 ppm.

Phosphate Solubilizing Microorganisms and Phosphate Solubilizing Rhizobium – Mini Review

2013 ◽  
Vol 295-298 ◽  
pp. 2328-2332 ◽  
Author(s):  
Shu Qing Zhang ◽  
Jian Feng Li ◽  
Shang Li Shi ◽  
Ping Hui Huo ◽  
Wu Wu Wen ◽  
...  
Keyword(s):  
Indole Acetic Acid ◽  
Growth And Yield ◽  
Phosphate Deficiency ◽  
Limiting Factor ◽  
Yield And Quality ◽  
P Application ◽  
Phosphate Solubilizing ◽  
The Cost ◽  
Available Phosphate

Phosphorus is the main nutrient element for plant growth, whereas most of phosphate in soil is fixated by calcium, aluminum, iron and organic compounds. Available phosphate deficiency has been the main limiting factor that influences the yield and quality of agricultural products. P solubilizing microorganisms have been widely reported of solubilizing different forms of insoluble phosphates. P solubilizing Rhizobium, especially for strains with the ability of secreting 3-Indole acetic acid, which is also capable of fixating N and inoculation, is found excellent in promoting growth and yield of legume crops, which decreases the cost of agricultural production and the side effect of P application to the environment. The mechanism and amount range of P solubilization for Rhizobium are varied among strains. These results and phenomena from different studies are discussed in this paper.

Loss of Available Phosphate in Soil due to Micro-Organisms

Nature ◽  
1946 ◽  
Vol 158 (4013) ◽  
pp. 447-447 ◽  
Author(s):  
C. B. TAYLOR
Keyword(s):  
Micro Organisms ◽  
Available Phosphate

The rapid determination of available phosphate in soil by the coeruleo-molybdate reaction of Denigès

1924 ◽  
Vol 14 (2) ◽  
pp. 192-197 ◽  
Author(s):  
W. R. G. Atkins
Keyword(s):  
Rapid Determination ◽  
Phosphorus Pentoxide ◽  
Aqueous Extracts ◽  
Phosphate Content ◽  
Dilute Solutions ◽  
Insoluble Form ◽  
Molybdate Method ◽  
Available Phosphate ◽  
High Phosphate

1. The coeruleo-molybdate method of Denigès affords a rapid means of estimating phosphates in such dilute solutions as are given by aqueous extracts of soils, 1:5, even when the extract is diluted twenty-fold.2. High phosphate values were found for bog peats, but the majority of the soils studied gave to the extract phosphate corresponding to under two parts per million of phosphorus pentoxide. Dunged soil gave 20 p.p.m. or more.3. Extraction for 3–4 hours gives values as high as extraction for 4–7 days with ordinary soils of low phosphate content, but the phosphate of richer soils may undergo a reversion to an insoluble form during prolonged extraction.

scholarly journals Engineered Root Bacteria Release Plant-Available Phosphate from Phytate

2019 ◽  
Vol 85 (18) ◽  
Author(s):  
Christine N. Shulse ◽  
Mansi Chovatia ◽  
Carolyn Agosto ◽  
Gaoyan Wang ◽  
Matthew Hamilton ◽  
...  
Keyword(s):  
High Yield ◽  
Natural Soil ◽  
Soluble Phosphate ◽  
Phosphate Fertilizers ◽  
Content Type ◽  
Generate Plant ◽  
Phytate Hydrolysis ◽  
Phosphate Solubilizing ◽  
Phosphate Source ◽  
Available Phosphate

ABSTRACTMicroorganisms that release plant-available phosphate from natural soil phosphate stores may serve as biological alternatives to costly and environmentally damaging phosphate fertilizers. To explore this possibility, we engineered a collection of root bacteria to release plant-available orthophosphate from phytate, an abundant phosphate source in many soils. We identified 82 phylogenetically diverse phytase genes, refactored their sequences for optimal expression inProteobacteria, and then synthesized and engineered them into the genomes of three root-colonizing bacteria. Liquid culture assays revealed 41 engineered strains with high levels of phytate hydrolysis. Among these, we identified 12 strains across three bacterial hosts that confer a growth advantage on the model plantArabidopsis thalianawhen phytate is the sole phosphate source. These data demonstrate that DNA synthesis approaches can be used to generate plant-associated strains with novel phosphate-solubilizing capabilities.IMPORTANCEPhosphate fertilizers are essential for high-yield agriculture yet are costly and environmentally damaging. Microbes that release soluble phosphate from naturally occurring sources in the soil are appealing, as they may reduce the need for such fertilizers. In this study, we used synthetic biology approaches to create a collection of engineered root-associated microbes with the ability to release phosphate from phytate. We demonstrate that these strains improve plant growth under phosphorus-limited conditions. This represents a first step in the development of phosphate-mining bacteria for future use in crop systems.

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