The abundance of heterocystous blue-green algae in rice soils and inocula used for application in rice fields

1987 ◽  
Vol 5 (2) ◽  
Author(s):  
P.A. Roger ◽  
S. Santiago-Ardales ◽  
P.M. Reddy ◽  
I. Watanabe
Keyword(s):  
Green Algae ◽  
Rice Fields ◽  
Rice Soils ◽  
Blue Green Algae

scholarly journals Rice Field Blue-green Algae of Bongaigaon District, Assam

Our Nature ◽  
1970 ◽  
Vol 8 (1) ◽  
pp. 357-359
Author(s):  
A.K. Das ◽  
G.C. Sarma
Keyword(s):  
Green Algae ◽  
Rice Field ◽  
Single Species ◽  
Rice Fields ◽  
Blue Green Algae

The present study deals with the blue-green algae (BGA) from the rice fields of Bongaigaon district, Assam. 23 species of blue-green algae belongs to 12 genera has been enumerated. Maximum species were found under the genus Nostoc (4), Anabaena (4), which is followed by Scytonema (3) Aphanocapsa (2), Aphanothece (2) and Phormedium (2). Single species was represented by the genera Microcystis, Chroococcus, Merismopedia, Oscillatoria, Aulosira and Calothrix.DOI: 10.3126/on.v8i1.4344

Blue-green algae from rice fields in Kerala State, India

Hydrobiologia ◽  
1987 ◽  
Vol 144 (3) ◽  
pp. 223-232 ◽  
Author(s):  
N. Anand ◽  
R. S. Shantha Kumar Hopper
Keyword(s):  
Green Algae ◽  
Rice Fields ◽  
Blue Green Algae ◽  
Kerala State

scholarly journals The role of blue-green algae in nitrogen fixation in rice-fields

1939 ◽  
Vol 127 (846) ◽  
pp. 121-139 ◽  
Keyword(s):  
Nitrogen Fixation ◽  
Soil Temperature ◽  
Green Algae ◽  
Rice Fields ◽  
Harvest Time ◽  
Dry Period ◽  
Blue Green Algae

The problem, with which this paper deals, arose out of the observation that in India rice can be grown on the same land for long periods without the addition of manure to the soil (Howard 1924, p. 114). Three distinct periods are distinguishable in Indian rice fields, viz.: (1) Waterlogged period (from transplantation up to harvest time), in which there are a few inches to several feet of water above the soil and which is distinguished by the growth of abundant algae. (2) The dry period, which follows in winter after harvest and during which conditions remain very suitable for microbiology activity. (3) The desiccation period, commencing after winter when the soil temperature frequently exceeds 50° C.

Nitrogen-fixing Blue-Green Algæ in Australian Rice Soils

Nature ◽  
1961 ◽  
Vol 192 (4801) ◽  
pp. 479-480 ◽  
Author(s):  
J. S. BUNT
Keyword(s):  
Green Algae ◽  
Nitrogen Fixing ◽  
Rice Soils ◽  
Blue Green Algae

THE EFFECT OF THE GAMMA-ISOMER OF BENZENE HEXACHLORIDE UPON THE MICROFLORA OF SUBMERGED RICE SOILS: I. EFFECT UPON ALGAE

1967 ◽  
Vol 13 (2) ◽  
pp. 173-180 ◽  
Author(s):  
K. Raghu ◽  
I. C. MacRae
Keyword(s):  
Green Algae ◽  
Detrimental Effect ◽  
Stem Borer ◽  
Rice Soils ◽  
Blue Green Algae ◽  
Rice Stem Borer ◽  
Submerged Soils ◽  
Algal Groups ◽  
Benzene Hexachloride ◽  
Qualitative Changes

The effect of additions of the gamma-isomer of benzene hexachloride (gamma-BHC) upon algal populations in two submerged tropical rice soils was studied. Additions of the insecticide to the floodwaters of the soils at 5, 6, and 50 kg/ha active compound resulted in a marked stimulation of growth of the indigenous algae. The stimulation was attributed to the elimination by the insecticide of small animals which feed on the algae. No detrimental effect upon total algal populations was found when gamma-BHC was applied at 50 kg/ha, which is 10 times the rate recommended to control the rice stem borer. Qualitative changes were detected in the incidence of major algal groups. Blue-green algae were more abundant in treated soils whereas the green algae and diatoms were more abundant in the untreated soils. Much larger amounts of algal tissue were produced in the floodwaters treated with gamma-BHC. The possible effects of increased algal development on the fertility of the soil and the persistence of gamma-BHC in submerged soils are discussed.

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