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sabadilla:Schoenocaulon officinale A liliaceous plant of Mexico, having long, grasslike leaves and bitter seeds. The seeds of this plant are used medicinally as a source of veratrine and veratridine.
sage:Saliva officinalis. A grey-green herb, whose leaves are used as herbal medicine and seasoning.
salicycilic acid:(C6H4(OH)(COOH)) Acid used in medicine to prepare aspirin and as is, and as a food preservative.
saturated fats:Fat with no double bonds between atoms of carbon. Called saturated because no more hydrogen can be added.
secretion:The act or process of separating, elaborating, and releasing a substance that fulfills some function within the organism or undergoes excretion. Or the product of this act.
sequences:Also: one-dimensional array. A type of information where one element comes after another.
short rotations:A planting system where the crop in one area changes frequently.
silt:Earthy matter, fine sand, or the like, carried by moving or running water and deposited as a sediment.
sisal:Also: sisal hemp. A fibre from Agave sisalana. Native to Yucatàn.
small-pox:An acute, highly contagious, febrile disease, caused by a virus, and characterized by a pustular eruption that often leaves permanent pits or scars.
sodium carbonate:Na2CO3. Also called soday ash, an anhydrous, grayish-white, odourless water-soluble powder.
soja:Also: soybean. A bushy, leguminous plant. Of the Old World, grown in the U.S. chiefly for forage and soil improvement. The seed of this plant is used, used for food, as a livestock feed, and for a variety of other commercial uses.
solvent:A substance that dissolves another to form a solution.
sorghum:Sorghum vulgar. A cereal grass, having broad, corn like leaves and a tall, pithy stem bearing the grain in a dense thermal cluster. Also the syrup made from sorgo.
sorgo:Any of several varieties of sorghum grown chiefly for the sweet juice yielded by the stems, used in making sugar and syrup and also for fodder.
soybean:A bushy, leguminous plant. Of the Old World, grown in the U.S. chiefly for forage and soil improvement. The seed of this plant is used, used for food, as a livestock feed, and for a variety of other commercial uses.
spasm:A sudden, abnormal, involuntary muscular contraction.
species:A class of individuals having some common characteristics or qualities.
spillways: When gravity drainage is not possible, a pumping system will be necessary. In addition, surface drainage may be necessary to properly route excessive water inflows. This may be accomplished through drainage culverts or grassed spillways.
spirula:Any cephloapod of the genus Spirula, having a flat, spiral shell that is partly inside and partly outside the posterior part of the body.
sprouts:A new growth from a germinating seed, or from a rootstock, tuber, bud, or the like.
spruce:Any evergreen, coniferous tree of the genus Picea, having short, angular, needle shaped leaves attached singly around twigs.
steroids:Any of a large group of fat soluble organic compounds, as the sterols, bile acids, and sex hormones, most of which have specific physiological action.
stranglevine:Mossenia odorata. A vine which prefers to grow along tree trunks, in the end choking them.
stringency:Strictness, closeness, rigor.
subsidy:A direct (usually financial) aid furnished by a government to a private industrial undertaking, a charity organization, or the like.
subsequent:Following in order or succession; succeeding.
substrate:A substance acted upon.
sulfur:Symbol: S. Atomic mass: 32.006. A non metallic yellow element. Used in the making of gun powder and matches.
sulfate SO4 supplements:An addition to a substance, in order to complete, reinforce, or extend a whole.
Sumerians:People who lived in an ancient region in southern Mesopotamia which contained a number of independent cities and city-states which were established as early as 5000 B.C.
supplements:An addition to a substance, in order to complete, reinforce, or extend a whole.
support fibres:The tissues of a plant which bear or hold up the load, mass, or structure of the plant.
surface area:The outer face, outside, or exterior boundary of a thing.
surface-active agent:Any substance that when dissolved in water or an aqueous solution reduces its surface tension or the interfacial tension between it and another liquid.
surfactants:See surface-active agent.
surplus:That which remains above what is used or needed.
sustainable:To be supportable, and maintainable.
synthesized:To have been produced by the combining of two or more elements or materials to create a new material or abstract entity.
synthetic:Conceived by artificial means, in a laboratory for example, as opposed to by natural means.
synthetic mulch:A mulch made with man made fibres. See mulch.
systematic:Having, showing, or involving a system, method, or plan.
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