Feedstock. Perennial grasses, biomass sorghum, crop residues, soy beans, woody biomass.

生产的原料：多年生禾草、生物质高粱、农作物残余物、大豆、木质生物质。

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Planting perennial grasses on existing agricultural lands had the most beneficial effect on soil carbon, the researchers found.

研究者发现，在现有农田种植多年生草本植物是涵养土壤，提高碳含量的最佳做法。

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Farmers nationwide were encouraged, sometimes with cash payments, to stop cultivating their land and to plant native and perennial grasses.

全国农民受到鼓励(有时付给现金)放弃耕种自己的土地，而去种植天然牧草和多年生牧草。

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Instead, it collects, oasis-like, just below the surface where it can sustain the termites and a supply of perennial grasses at the margins of the circles.

BBC: Termites 'engineer fairy circles'