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"Coal is the most abundant type of fossil fuel, accounting for 64% of globally recoverable resources in the world, compared to oil (19%) and natural gas (17%). Coal is traditionally used in the energy sector, generating about 40% of the world's electricity. The demand for coal is expected to increase by over 60% from 2006 to 2030, of which developing countries will account for over 90%. Coal-fired electricity generation is still a major energy source in North America and Australia. In addition, coal is also used in the metallurgical sector where 70% of the world's steel industry depends on it. The challenge here has been in how to maximize productivity, reduce energy consumption, and drastically reduce carbon dioxide (CO2) emissions (Osborne and Gupta 2013). Efforts have been made to offer a more efficient and cleaner use of coal, including its use in the production of electricity, steel and its associated products, and energy related chemicals, as well as increasing the use of coal byproducts (Osborne et al. 2013). While significant progresses have been achieved, it is still worth seeking new environmentally friendly and efficient usages of coal beyond these well-known applications. Such usages are not set to immediately replace the existing applications of coal, however, but instead provide alternatives so that whenever the opportunity arises, new market sectors can be generated and expanded as quickly and efficiently as possible"--

Soils --- Humic acid content.

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Plant husbandry --- Pedology --- Soil --- Humus --- Acide humique --- Humic acids --- Sol arable --- Arable soils --- Crops and soils --- Soils --- Congresses. --- Humic acid content

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Despite the large number of papers and books published on soil organic matter (humus), our knowledge of the subject is still very limited, as is our knowledge of humic acid. The author of this book began to study humus at the end of the 1940s and continued until 1984 when he retired from Nagoya University. With the intention of establishing a systematic understanding of soil organic matter, he has compiled facts and a discussion of humus based on his extensive experimental results during the past 40 years.In this book, humic acids are classified into A, B, Rp and P types, based on th

Humus --- Humic acid --- Acides humiques --- Humus. --- Soils --- Mold, Vegetable --- Mould, Vegetable --- Muck --- Organic matter in soil --- Soil organic matter --- Vegetable mold --- Histosols --- Organic fertilizers --- Compost --- Plant litter --- Humic acid content. --- Organic matter --- Composition --- Soil chemistry