Properties Of Biochar Derived From Castor Plants

In Latin America, Amazonian natives have been using biochar along with organic waste for centuries or even millennia to enhance the soil and alter its characteristics, creating thus highly-fertile patches in a marginal land. This ancient anthropogenic intervention in agriculture resulted in the long-term establishment of a healthy soil characterized by an increased content of stable organic matter and nutrients, a land known as “Amazonian Dark Earths” or “Terra Preta.”

Biochar is a carbon-rich material with a porous structure, and it differs from charcoal and similar materials by the fact that it has a high fixed carbon content, minimal tars, and a high surface area. When used as a soil amendment, improves soil productivity, carbon storage, or filtration of percolating soil water. The important properties of biochar in relation to its use as a soil amendment are the surface area, porosity, electrical conductivity, pH, water holding capacity, and cation exchange capacity.

Biomass from plants or other organic material can be converted to biochar at high temperature in the absence of oxygen. Biochar has a high carbon content, low H/C ratio and retains most of the nutrients contained in the original biomass (feedstock). The surface area and porosity of biochar generally increase with longer pyrolysis time and higher temperature. The increased surface area is positively correlated to the water holding capacity and porosity. Based on the production conditions and feedstock characteristics, biochar properties both chemical and physical may vary profoundly. Ultimately, each biochar type must be studied in relation to its effect on plants when used as soil amendment.

Researchers from Institute of Applied Biosciences and Chemical Process and Energy Resources Institute of CERTH in Greece produced biochar by slow pyrolysis at 550 °C from castor stalks and de-oiled castor cake, both by-products of castor oil production, in view of sustainable valorization of a potential large-scale cultivation of castor beans. Their work is published in the research journal, Biomass and Bioenergy. The extraction of castor oil generates large amounts of de-oiled castor cake containing ricin, a highly toxic glycoprotein that requires heat treatment prior to its valorization.

The produced biochars were highly alkaline and had significant differences in terms of surface area, morphology, nutrient content, and ratios of atomic C:N and H:C. Castor-derived biochar affected germination and development of castor seedlings but not of tomato seedlings. Specifically, castor stalk-derived biochar affected positively root length and complexity of castor seedlings promoting a well-developed root system.

A less profound but noticeable effect was observed in tomato seedlings. In both species, biochar treatments promoted lateral root initiation but increased the developmental rate only in castor. Furthermore, biochars affected soil cation exchange capacity Based on the results, castor biochars improved castor seed germination, achieving 90% success rate earlier when compared to control. On the contrary, biochar did not affect significantly the germination of tomato seedlings. However, in both species, the biochar treatments promoted lateral root initiation but increased the developmental rate only in castor. In addition, biochars affected soil capacity to retain several macro- and micro-nutrients beneficial for plant growth.

Modern agricultural practices rely on the excessive use of inorganic fertilizers to maintain high yields. Currently, more than half of nitrogen fertilizers applied globally, escape into the environment without being used by crops. Modern agriculture has to overcome issues such as: drought, nutrient leaching, salinity and heavy metal toxicity. Biochar may offer an eco-friendly alternative solution to overcome such issues.

These findings are described in the article entitled Characterization of castor plant-derived biochars and their effects as soil amendments on seedlings, recently published in the journal Biomass and Bioenergy. This work was conducted by Z. Hilioti, C.M. Michailof, D. Valasiadis, E.F. Iliopoulou, V. Koidou, and A.A. Lappas from CERTH.

Reference:

  1. Z. Hilioti, C.M. Michailof, D. Valasiadis, E.F. Iliopoulou, V. Koidou, A.A. Lappas. Characterization of castor plant-derived biochars and their effects as soil amendments on seedlings. Biomass and Bioenergy, volume 105 (2017) 96-106.

About The Author

ZH
Zoe Hilioti

Zoe Hilioti is Senior Researcher of the Institute of Applied Biosciences at CERTH. She graduated in 1991 from Aristotle University of Thessaloniki and the School of Agriculture with specialization in Plant Sciences. She then earned a master’s degree in Greenhouse Management/Protected Crops from the Mediterranean Agronomic Institute of Chania in 1993 and a Ph.D. in Horticulture/Molecular Biology from the Pennsylvania State University in 1998. Her current research is aimed at achieving an integrated and systems-level approach of the mechanisms by which extracellular and intracellular cues influence cell function and morphogenesis.

Speak Your Mind!

READ THIS NEXT

Closing The Loop For Bio-Oil Production From Microalgae By Hydrothermal Liquefaction

Hydrothermal liquefaction (HTL) of microalgae has attracted growing interest for bio-oil production because it does not require dewatering and drying of algal biomass. However, up to now, this technology has rarely been commercialized. One of the problems impeding its industrialization is the production of wastewater (the aqueous phase product) during HTL. More than 20% of […]

Urban And Sick And Rural: Psychiatric Disturbances Affect Children In Areas With Especially Low Neighborhood Solidarity

For years, scientists have seen an association between city living and psychiatric disturbances such as schizophrenia in adults. Now they have investigated twins to see how much urban life is already affecting children. Especially two factors became apparent. Almost all over the world, humans are moving into cities. Attracted by workspace, cultural opportunities, mobility, and […]

New NASA Study Able To Track Hurricane Harvey Storm Water With GPS

As many of you might remember, on August 26, 2017, Hurricane Harvey, a category 4 hurricane, made landfall along the Texas coast and remained in the state until September 1st. During that time the hurricane dumped over 5 feet of rain on some areas of the state, and that begged the question from many; where […]

Therapeutic Targeting Of Marijuana Receptors: Type 1, 2 Or Both – That Is The Question

Preparations of Cannabis Sativa L. plants (marijuana) have been used for medicinal and recreational purposes for thousands of years. Today, cannabis is one of the most abused drugs in the UK, and its medicinal use for the management of anxiety and pain caused by a variety of diseases is growing. Patients smoke and vape marijuana […]

Scientists Discover A Natural Plant Product That Combats Endocrine Resistance In Breast Cancer

Despite emerging targeted therapies for breast cancer developed in recent years, breast cancer remains to be the second leading cause of cancer-related death in U.S. women. A team at the McArdle Laboratory for Cancer Research at the University of Wisconsin Carbone Cancer Center identified a naturally occurring compound that helps restrict the uncontrolled growth of breast cancer […]

Corneal Endothelia Dynamically Balanced On The Cell Jamming Boundary

The cornea is a transparent window inside the body. It transmits light into the eye and helps focus it onto the retina. The corneal endothelium is a single cell layer on its inner surface that is responsible for maintaining corneal transparency. By continually pumping water back into the aqueous humor, transparency is maintained through the […]

How X-Ray Fluorescence Methods Reveal Past Climate Changes

Geology tries to understand the past by looking at the contemporary world. There is the famous phrase of uniformitarianism “Present is the key to the past”, which can be understood as the “laws” of nature have acted more or less the same throughout the geological past. Therefore, in order to comprehend the marks of ancient […]