Crop recovery of sup 15 N from microalgae grown in simulated inorganic-wastewater medium
- Alabama A and M Univ., Normal (USA)
A greenhouse experiment was carried out using a Decatur silt loam soil to assess the availability and recovery of algal nitrogen (labeled) which was previously grown in simulated inorganic-wastewater medium by grain sorghum. Dried green or blue-green algal biomass providing 175, 350 and 525 mg labeled N/kg of soil was used as sources of nitrogen. Application of 175, 350 and 525 mg N/Kg of soil as algal biomass resulted in the release of 73.2, 126.7 and 181.6 mg N for green and 85.9, 147.6 and 183.3 mg N for blue-green algal biomass, respectively, via mineralization over a 6-week period. These values correspond to 35 to 42% of total N applied as green and 35 to 49% of total N applied as blue-green algal biomass. Grain sorghum plants assimilated 25 to 34% of total N applied as green algae and 24 to 45% as blue-green algae during 6 weeks of growth. The application of above mentioned rates increased the shoots yield by 94, 82, and 65% for green algae and 88, 61, and 61% for blue-green algae, respectively. No significant increase was observed for the application of algal biomass at a rate higher than 175 mg N/kg of soil. Total N uptake by grain sorghum increased significantly due to the addition of algal biomass to the soil. About 58 to 65% of total green algal N and 51 to 65% of total blue-green algal N remained in the soil. Six to 12% of the total N applied as green algae and 4 to 11% as blue-green algae biomass was unaccounted for.
- OSTI ID:
- 5086116
- Journal Information:
- Journal of Environmental Science and Health, Part A: Environmental Science and Engineering; (USA), Vol. 23:8; ISSN 0360-1226
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
ALGAE
RESOURCE POTENTIAL
NITROGEN 15
UPTAKE
SORGHUM
PLANT GROWTH
BIOLOGICAL AVAILABILITY
BIOMASS
METABOLISM
TRACER TECHNIQUES
WASTE MANAGEMENT
WASTE WATER
CEREALS
ENERGY SOURCES
GRASS
GROWTH
HYDROGEN COMPOUNDS
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
LILIOPSIDA
LIQUID WASTES
MAGNOLIOPHYTA
MANAGEMENT
NITROGEN ISOTOPES
NUCLEI
ODD-EVEN NUCLEI
OXYGEN COMPOUNDS
PLANTS
RENEWABLE ENERGY SOURCES
STABLE ISOTOPES
WASTES
WATER
540320* - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)
550501 - Metabolism- Tracer Techniques