Simultaneous P-Solubilizing and Biocontrol Activity of Rhizobacteria Isolated from Rice Rhizosphere Soil

A typical rice field ecosystem as the research object, using the indoor pot experiment to study the three kinds of water driven (shallow layer of continuous irrigation (C), alternating wet and dry (J), and water control mode (G)) on the effect of rice rhizosphere soil denitrification intensity. Effect of changes in soil moisture caused by the three different irrigation patterns on different growth stages of rice on rhizosphere denitrification was comparatively analyzed,referring to the rhizosphere denitrification capacity during different rice growth stage.The results showed that: soil denitrification intensity with different water managements changed significantly, showing C>J>G. And with the growth of plants, under three different water managements, denitrification intensity showed a downward trend. Mature reached to a minimum. All have to be higher than control groups.

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Nitrogen fixation (C2H2reduction) in the rice rhizosphere soil as influenced by pesticides and methods of their application

The Journal of Agricultural Science ◽

10.1017/s0021859600035401 ◽

1983 ◽

Vol 100 (3) ◽

pp. 637-642 ◽

Cited By ~ 18

Author(s):

J. L. N. Rao ◽

I. C. Pasalu ◽

V. Rajaramamohan Rao

Keyword(s):

Nitrogen Fixation ◽

Rhizosphere Soil ◽

Nitrogenase Activity ◽

Differential Response ◽

Field Application ◽

Rice Fields ◽

Variable Effect ◽

Seedling Root ◽

Rice Rhizosphere ◽

Micro Organisms

SUMMARYThe effect of pesticides on nitrogenase activity in rhizosphere soil from rice fields was investigated. The differential response of insecticides on nitrogenase depended on the method of field application. Results also showed that the differential response to the pesticides of. specific groups of nitrogen-fixing micro-organisms depended upon the method of application.Soil incorporation of carbofuran stimulated the rhizosphere nitrogenase, while endosulfan and hexachlorocyclohexane inhibited it. Carbofuran and hexachlorocyclohexane stimulated nitrogenase when applied to the standing water. Seedling root dips of isofenphos stimulated nitrogenase, while endosulfan, BPMC and carbaryl showed a variable effect. Quinalphos inhibited nitrogenase irrespective of method of application.

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Characterization of Chryseobacterium aquaticum Strain PUPC1 Producing a Novel Antifungal Protease from Rice Rhizosphere Soil

Journal of Microbiology and Biotechnology ◽

10.4014/jmb.0803.173 ◽

2009 ◽

Cited By ~ 5

Author(s):

N. Sakthivel

Keyword(s):

Rhizosphere Soil ◽

Rice Rhizosphere

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Rhizosphere soil nitrogenase (C2H2reduction) as influenced by the nitrogen management in intermediate deep water rice

The Journal of Agricultural Science ◽

10.1017/s0021859600038569 ◽

1983 ◽

Vol 101 (3) ◽

pp. 547-551 ◽

Cited By ~ 2

Author(s):

J. L. N. Rao ◽

B. B. Reddy ◽

V. Rajaramamohan Rao

Keyword(s):

Water Level ◽

Deep Water ◽

Rhizosphere Soil ◽

Nitrogenase Activity ◽

Nitrogen Management ◽

Nitrogen And Phosphorus ◽

Urea Nitrogen ◽

Rice Rhizosphere ◽

Urea Briquettes ◽

Intermediate Deep Water

SUMMARYIn a field experiment, the influence of different forms and methods of application of urea nitrogen on the rice rhizosphere soil nitrogenase was evaluated under simulated intermediate deep water situations. Nitrogenase was high when the soil received small amounts of nitrogen and phosphorus with a water level of 20–25 cm. Moreover, during and after the flash floods the nitrogenase activity was considerably increased. There was a significant reduction in the nitrogenase activity when the nitrogen was applied to the shallow water through urea briquettes, but when it was applied either behind the plough or between the rows, the activity was stimulated. Increased water level of about 50 cm for prolonged periods considerably reduced the nitrogenase activity. Results indicate that the method of application of urea nitrogen and the water level influenced the rhizosphere soil nitrogenase activity under intermediate deep water situations.

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