Cyanobacteria can fix atmospheric nitrogen. 22:436-442. Introduction to Blue Green Algae: The economic importance of blue green algae (BGA), also known as cyanobacteria primarily lies in their agronomic importance as Biofertilizers due to their N 2-fixing ability that helps them to grow successfully in habitats with low or no combined nitrogen.They are naturally found in most paddy soils and improve the fertility and texture of the soil. Cyanobacteria are well known for having nitrogen fixing ability and other agriculturally important potentialities. can also fix free nitrogen of the atmosphere by means of heterocysts and thus increase fertility of the soil. In the field of agriculture, cyanobacteria have been mainly used as biofertilizers due to their role as nutrient supplements [42]. Abed1, S. Dobretsov2 and K. Sudesh3 1 Biology Department, College of Science, Sultan Qaboos University, Al Khoud, Sultanate of Oman 2 Marine Science and Fisheries, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al Khoud, Sultanate of Oman Cyanobacteria can be helpful in agriculture as they have the capability to fix atmospheric nitrogen to soil. Cause : The most common toxic blue-green algae in Queensland fresh waters are Cylindrospermopsis raciborskii, Microcystis aeruginosa and Anabaena circinalis.. This review focuses mainly on importance of cyanobacteria in agricultural field crops (especially paddy crop). Blue-green algae have very special cells called Heterocyst. 13. Aulosira, Anabaena, Cylindrospermum, Nostoc, Plectonema, Tolypothrix) in the paddy fields was realized much earlier (Singh, 1961). Ex: cyanobacteria. The aerobic nitrogen-fixing capacity of some cyanobacteria makes them important players in the biogeochemical nitrogen cycle of tropical oceans, terrestrial environments, and in some agricultural lands. Other causes include increased recreational activity, pollution, increases in agricultural and individual fertilizer use, and increased population density. Cyanobacteria are unique organisms performing photosynthesis, bioremediation of wastewater, high biomass and biofuel productions etc. Around the Chesapeake Bay, agriculture is a major contributing factor to the amount of nutrient pollution, which causes eutrophic waters and cyanobacteria blooms. Importance of Biofertilizers in Agriculture Biotechnology Prashant Agarwal1*, Ritika Gupta1, Imneet Kaur Gill2 1Meerut Institute of Engineering and Technology, Meerut, India 2Department of Pharmaceutics, Chandigarh College of Pharmacy, Mohali, Punjab, India ABSTRACT Over the past few decades, many farmers have been involved in improving wild plants and animals by selection Q.4.Give any two advantages of blue green algae in farming. Cyanobacteria act as important biofertilisers. In Africa, spirulina is regularly collected for human consumption. Cyanobacteria, or blue-green algae, is one such example of a bio-fertilizer, a type of organic fertilizer which contains living organisms and harnesses naturally occurring inputs like solar energy, nitrogen, and water to ensure soil fertility and plant growth. Their use in agricultural fields increases soil fertility and thus they are used as biofertilizer. They also add organic matter to the soil and increase its fertility. 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