Algae Literature Review

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Algal biomass as plant fertilizer and Growth Stimulant Literature review In this literature review, we discuss algae characteristics and cultivation. Moreover, we provide information about the use of algae as fertilizers and growth stimulants, the definition of biofertilizer and biostimulant, and how they help the plant to grow and to produce a higher yield. Also, we provide several case studies of researches aimed to elucidate the role of algae as biofertilizers and biostimulants. General characteristics of algae Algae are one of the largest groups in the eukaryote domain; it consists of a vast group of organisms that differ in shape and size. They may be single-cellular such as Chlorella or multicellular that may reach to more than one meter…show more content…
Open systems are cheap, easy to construct and have high production capacity. However, open systems have several disadvantages including, the uncontrolled environment in and around it, and this result in lower biomass productivity (Singh, 2012). Moreover, open ponds have a higher rates of contamination by other microorganisms such as bacteria, fungi and other algae species. PBRs are a stable environment for the growth of many organisms including algae. Moreover, photobioreactors offer the ability to produce specific biomolecules such as vitamins, lipids, and biopharmaceuticals. However, photobioreactors are expensive, requires special sophisticated equipment’s and not easy to construct. There are different types of PBRs such as vertical tubular, bubble column, flat panel, airlift, stirred tank, and hybrid type PBR (Ugwu, 2008, Singh and Sharma,…show more content…
The term biostimulant refers to any substances that enhance plant growth and development when applied in small concentrations, they work as metabolic enhancers that regulate the uptake of essential nutrients (Khan et al., 2009, Van Oosten et al., 2017). Algae and cyanobacteria produce these substances as a strategy to survive; the role of these substances on their growth is controversial until now (Maschek and Baker,

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