Peer Review #2 of "Impact assessment of high soil CO2 on plant growth and soil environment: a greenhouse study (v0.1)"

To ensure the safety of carbon capture and storage (CCS) technology, insight into the potential impacts of CO2leakage on the ecosystem is necessary. We conducted a greenhouse experiment to investigate the effects of high soil CO2on plant growth and the soil environment. Treatments comprised 99.99% CO2injection (CG), 99.99% N2injection (NG), and no injection (BG). NG treatment was employed to differentiate the effects of O2depletion from those of CO2enrichment. Soil CO2and O2concentrations were maintained at an average of 53% and 11%, respectively, under CG treatment. We verified that high soil CO2had negative effects on root water absorption, chlorophyll, starch content and total biomass. Soil microbial acid phosphatase activity was affected by CG treatment. These negative effects were attributed to high soil CO2instead of low O2or low pH. Our results indicate that high soil CO2affected the root system, which in turn triggered further changes in aboveground plant tissues and rhizospheric soil water conditions. A conceptual diagram of CO2toxicity to plants and soil is suggested to act as a useful guideline for impact assessment of CCS technology.

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MARINE MACROALGAE: PLANT GROWTH STIMULATORS

EPRA International Journal of Research & Development (IJRD) ◽

10.36713/epra6093 ◽

2021 ◽

pp. 110-118

Author(s):

Haresh S. Kalasariya ◽

Nikunj B. Patel ◽

Ankita Jain ◽

Nayan D. Prajapati ◽

Richa N. Patel

Keyword(s):

Plant Growth ◽

Agricultural Sector ◽

Marine Macroalgae ◽

Soil Environment ◽

Growth Stimulator ◽

Agricultural Applications ◽

Plant Growth Promoting ◽

Review Study ◽

Growth Promoting

The modern agricultural sector is mainly dependent on synthetic fertilizer for enhancing the growth of crop improvements but a burden of inorganic and chemical-based fertilizer currently created a serious threat to human health as well as the soil environment. Fertilizer research is therefore focusing on an alternative to chemical fertilizer by exploiting natural sources such as marine macroalgae or seaweed. The use of seaweed will be an eco-friendlier approach to sustainable agriculture. Marine macroalgae or seaweed widely applicable in plant growth enhancements due to the presence of biological active phycocompounds such as proteins, phenolic compounds, amino acids, polysaccharides, plant-growth-promoting hormones, and some growth factors, etc. Several research studies have been carried out on the applicability of seaweed or the effect of marine algae or its components on plants and its quality. These types of constituents play their role in improving the morphological as well as biochemical characteristics of plants. The present review study focuses on the applicability of marine macroalgae as a biofertilizer or plant growth stimulator in agricultural applications. This study further helps to improve the nutritional quality of crops which prove to be useful in further investigations and applications. KEYWORDS: Seaweed, Marine Macroalgae, Biofertilizer, Growth stimulator, Agriculture

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