560 GLOSSARY 



Sulfate of potash. A fertilizer containing 37 to 50 per cent of 

 potash. 



Sweet clover. Melilotus alba; a biennial, summer-growing leg- 

 ume valuable for soil improvement, pasturage, and hay for 

 home use. 



Tap-root. The main central root of such plants as cotton. 



Tare (in cotton). The allowance for weight of the covering, or 

 bagging and ties, on a cotton bale ; in practice it is usually 

 24 pounds or less in American markets. 



Tassel. The panicle of male flowers borne at the top of a flower- 

 ing corn plant. 



Teosinte. A tropical forage plant closely related to corn. 



Tetranychus gloveri. The scientific name of the red spider, a 

 small mite that attacks cotton leaves. 



Threshing. The act of separating the grain of wheat, oats, etc., 

 from the straw and chaff. 



Throw-board. See Fig. 92 and p. 191. 



Tillage. Cultivation. 



Tiller. To branch from the crown ; to stool. 



Tilletia horrida. The scientific name of the fungus causing black 

 smut in rice. 



Tip. The end of a corn ear farthest from the point of attach- 

 ment. 



Toxic. Poisonous. 



Toxoptera graminum. The "green bug," a plant-louse injuring 

 grain plants. 



Transpiration. The loss of water from plants by its passing 

 into the air from the leaves, etc. 



Triticum. The name of the genus to which wheat belongs. 



Turn-plow. The kind of plow most generally used for turning 

 over the soil. It includes a concave moldboard for twisting, 

 pulverizing, and inverting the furrow-slice. 



Ustilago maydis. The scientific name of the fungus causing corn 

 smut. 



Variety. A subdivision of a species ; a group of individual plants 

 possessing in common certain botanical or agricultural 

 characteristics. 



Vegetable matter. Material now or recently existing in the form 

 of plant tissue. 



Vegetative branches or limbs. On the cotton plant, those 

 branches on which no boll stems are directly attached (see 

 p. 250); common equivalent terms are "base limbs" and 

 " suckers." 



