The International Research Group headed by Kikuchi Rumi, an environmental resource research center at the Japan Institute of Physical and Chemical Research, has developed the "Comprehensive Soil Evaluation Method Using Semi-Carbonized Biomass" to improve the soil by comprehensively analyzing the physical, chemical and biological characteristics of the soil. Soil is composed of gravel of varying sizes, humus remaining after microbial decomposition, and minerals such as rainwater and rivers. These materials are intertwined to form a cohesive structure that holds the soil in moderation of moisture and provides oxygen to plants and soil organisms through the air passages. So far, many academic circles have published research reports on the soil environmental cycle, but the perspectives are mostly single. Because plants absorb nutrients, moisture and breathe through the roots, soil characteristics have a significant impact on plant growth. To maintain the normal growth of plants, the soil must have adequate humidity and air. In Sub-Saharan Africa, for example, the soil is very dry and the soil becomes extremely hardened after being hydrated, making agricultural cultivation difficult. In a report published in the British journal Science Report, the team claimed that in order to improve the soil structure, they used NMR methods to construct structures. They first broken the leaves of tung oil tree, heated to 240 degrees Celsius in anaerobic environment at low temperature, made of semi-carbonized biomass. The analysis was then conducted by infrared spectroscopy, thermal analysis, particle size distribution and two-dimensional solution nuclear magnetic resonance, and the moisture and hemicellulose components in the biomass formed by thermal decomposition were confirmed from the results of the metabolomic analysis. Based on the above analysis, the research team mixed semi-carbonized tung oil tree with various proportions in poor soil. It was found that the improved soil formed aggregate structure, and the structural stability of the physical characteristics appeared, which proved that the soil water-holding capacity increased . In addition, the phenomenon of symbiosis between plants and microorganisms also appeared after soil improvement. Researchers said the assessment could be used to rehabilitate the expanding desert strip and make it arable land, bringing new hope for food-ridden Africa's growing population.