Influence of hexachlorocyclohexane on the nitrogenase activity of rice rhizosphere soil

1981 ◽  
Vol 59 (3) ◽  
pp. 473-477 ◽  
Author(s):  
R. N. Mahapatra ◽  
V. Rajaramamohan Rao
Keyword(s):  
Rhizosphere Soil ◽  
Nitrogenase Activity ◽  
Rice Rhizosphere

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

1983 ◽  
Vol 100 (3) ◽  
pp. 637-642 ◽  
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.

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

1983 ◽  
Vol 101 (3) ◽  
pp. 547-551 ◽  
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.

Persistence of hexachlorocyclohexane isomers in soil planted with rice and in rice rhizosphere soil suspensions

1985 ◽  
Vol 1 (2) ◽  
Author(s):  
G.P. Brahmaprakash ◽  
B.R. Reddy ◽  
N. Sethunathan
Keyword(s):  
Rhizosphere Soil ◽  
Rice Rhizosphere ◽  
Hexachlorocyclohexane Isomers

Research on Improvement of Nitrogenase Activity of Free-Living Nitrogen-Fixing Bacteria Using DBD Plasma

2013 ◽  
Vol 671-674 ◽  
pp. 2674-2678 ◽  
Author(s):  
Yan Yun Zhu ◽  
Xiao Li Zhu ◽  
Fang She Yang
Keyword(s):  
Rhizosphere Soil ◽  
Barrier Discharge ◽  
Nitrogenase Activity ◽  
Nitrogen Fixing ◽  
Bacterial Strains ◽  
Dbd Plasma ◽  
Nitrogen Fixing Bacteria ◽  
Free Living ◽  
Reduction Assay ◽  
Rrna Sequencing

Nitrogen-fixing bacteria were screened from the rhizosphere soil of plants in Shaanxi in China. 36 free-living nitrogen-fixing bacterial strains were isolated and their nitrogenase activity were determined by acetylene reduction assay (ARA), two strains named FLNB03 and FLNB09 with higher nitrogenase activity were isolated and identified by 16S rRNA sequencing. The datum showed that FLNB03 was similar to Acinetobacter and their similarity reached 99%, FLNB09 was similar to Agrobacterium sp. and their similarity reached 99%. Then both of them were treated using Dielectric Barrier Discharge (DBD) plasma for mutation and their mutants called FLNB03-2 and FLNB09-3 were obtained. The nitrogenase activity of FLNB03-2 was 0.61±0.10 nmol•107cfu-1•h-1, and that of FLNB09-3 was 0.40±0.05 nmol•107cfu-1•h-1, their nitrogenase activity increased by 22.00% and 14.29% than their original bacteria respectively. FLNB03-2 and FLNB09-3 might be used as microbial fertilizer.

Micromonospora soli sp. nov., isolated from rice rhizosphere soil

2016 ◽  
Vol 109 (3) ◽  
pp. 449-456 ◽  
Author(s):  
Chitti Thawai ◽  
Chokchai Kittiwongwattana ◽  
Dusanee Thanaboripat ◽  
Chamroon Laosinwattana ◽  
Prommart Koohakan ◽  
...  
Keyword(s):  
Rhizosphere Soil ◽  
Rice Rhizosphere

Study on Denitrification Intensity in Rice Rhizosphere Soil under Water Management Model

2014 ◽  
Vol 1010-1012 ◽  
pp. 584-587 ◽  
Author(s):  
Han Xiang Chen ◽  
Ge Lan Ma ◽  
Zhi Gang Chen ◽  
Lei Chen ◽  
Ke Zhang
Keyword(s):  
Rhizosphere Soil ◽  
Control Mode ◽  
Growth Stages ◽  
Water Control ◽  
Intensity Effect ◽  
Continuous Irrigation ◽  
Rice Rhizosphere ◽  
Field Ecosystem ◽  
Irrigation Patterns ◽  
Different Growth Stages

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.

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

2017 ◽  
pp. 207-215 ◽  
Author(s):  
Saida Aarab ◽  
Francisco Javier Ollero ◽  
Manuel Megias ◽  
Amin Laglaoui ◽  
Mohammed Bakkali ◽  
...  
Keyword(s):  
Rhizosphere Soil ◽  
Rice Rhizosphere ◽  
Biocontrol Activity
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