Southern field crops (exclusive of forage plants) . ken in ginning damp cotton. Yields. — The average yield per acre in the United States isabout 200 pounds of lint, or two-fifths of a bale per acre. How-ever, more than a bale per acre is often grown in productivefields. Occasional jields of more than two bales per acre areobtained (Fig. 1-54). 340. Mechanical cotton-pickers. — The models in thePatent Office at Washington show that numerous cotton-pickers have been invented and that most of these havenever been brought into use. However, -nithin the firstdecade of the twentieth century several
Southern field crops (exclusive of forage plants) . ken in ginning damp cotton. Yields. — The average yield per acre in the United States isabout 200 pounds of lint, or two-fifths of a bale per acre. How-ever, more than a bale per acre is often grown in productivefields. Occasional jields of more than two bales per acre areobtained (Fig. 1-54). 340. Mechanical cotton-pickers. — The models in thePatent Office at Washington show that numerous cotton-pickers have been invented and that most of these havenever been brought into use. However, -nithin the firstdecade of the twentieth century several cotton-pickingmachines have demonstrated that they can pick large cpan-tities of cotton, that they can harvest 80 to 90 per centor more of the cottoia open at the time of operation, andthat they can pick without incluchng very much more trashthan that included by careless hand-picking. Manj of these mechanical pickers are only partlj- auto-matic, and require human brains and hands to guide theseparate picking devices. 364 SOVTHERN FIELD CROPS. CO TTOX IIAIIVES TISG 36o Some of these machines operate on the suction principle ;the open end of a hose pipe is directed by the human hand closeto each open boll, when the suction created by a revohing fanon the machine draws the seed cotton through a tube anrl into ahopper. An example of this class of suction machines is theWorswick-Haardt picker, invented by J. E. ^Vo^5^^^ck, ^lont-gomerj-, Alabama (Fig. Other mechanical pickers entangle the seed cotton by meansof innumerable sharp, tack-like points emliedded in narrow re-
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