guano — a natural manure composed chiefly of the excrement of sea birds, found especially on islands near the Peruvian coast.
humus — the dark organic material in soils, produced by the decomposition of vegetable or animal matter and essential to the fertility of the earth.
maul — a heavy hammer, as for driving stakes or wedges.
mulch — a covering, as of straw, compost, or plastic sheeting, spread on the ground around plants to prevent excessive evaporation or erosion, enrich the soil, inhibit weed growth, etc.
potash — potassium carbonate, especially the crude impure form obtained from wood ashes.
buffalo chips — the dried dung of buffalo used as fuel, especially by early settlers on the western plains.