EurekaMag.com logo
+ Site Statistics
References:
52,725,316
Abstracts:
28,411,598
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Regulation of invertebrate grazers as a means to enhance biomass and nitrogen fixation of cyanophyceae in wetland rice fields


Soil Science Society of America Journal 47(4): 669-675
Regulation of invertebrate grazers as a means to enhance biomass and nitrogen fixation of cyanophyceae in wetland rice fields
The effect of invertebrate grazing on the growth and N fixation of blue-green algae (Cyanophyceae) in flooded rice soils was investigated by depressing grazer populations. Grazers were controlled with commercial pesticides and seeds of neem (Azadirachta indica). Algal N fixation and standing biomass were estimated by acetylene-reduction activity and chlorophyll a measurements. Suppression of ostracod (Ostracoda) grazing by Perthane or neem seeds tripled blue-green algal biomass and increased N fixation rates 10-fold. In the absence of ostracods, free living blue-green algae multiplied rapidly early in the rice cultivation cycle to be succeeded by chlorophytes. Carbofuran was not an effective control measure. Suppression of molluscan grazing had little effect. The population of tubificids (Tubificidae) was higher in the plots where algal growth was stimulated than in other plots. Total rice grain N was increased up to 37% when grazing was arrested.


Accession: 006288876



Related references

Algal biomass in rice fields of Senegal: relative importance of Cyanophyceae that fix nitrogen. 1977

Nitrogen fixation by algae cyanophyceae in rice paddy fields in the albufera lake valencia spain. Collectanea Botanica (barcelona): 997-1008, 1982

Biological nitrogen fixation in wetland rice fields estimation and contribution to nitrogen balance. Plant & Soil 141(1-2): 41-55, 1992

Nitrogen fixation by algae (Cyanophyceae) in rice paddy fields in the Albufera lake, Valencia Spain, soil and water samples.1. Collectanea botanica a Barcinonensi Botanico Instituto edita3(2): 997-1008, 1982

The photosynthetic aquatic biomass in wetland rice fields and its effect on nitrogen dynamics. Efficiency of Nitrogen Fertilizers for Rice: 43-68, 1987

Estimation of biological N2 fixation and its contribution to nitrogen balance in wetland rice fields. Transactions 14th International Congress of Soil Science, Kyoto, Japan, August 1990 Volume III: 128-133, 1990

Biological N2 fixation in wetland rice fields: estimation and contribution to nitrogen balance. Developments in plant and soil sciences9(49): 41-55, 1992

Study of the activity of nonsymbiotic nitrogen fixation in soils of rice fields by means of nitrogen 15. Microbiology (New York) 42(4): (1974), 1973

Short- and long-term effects of ammonium on photodependent nitrogen fixation in wetland rice fields of Spain. Biology and fertility of soils4(4): 353-357, 1997

Algal biomass of rice-fields in Senegal: relative importance of N2-fixing Cyanophyceae. Revue d' Ecologie et de Biologie du Sol 14(4): 519-530, 1977