CHAPTER X. 



WHEAT. 



Climate. — The yield and quality of wheat and 

 hence its successful growth, agriculturally considered, 

 depends mainly upon these six conditions: climate, 

 soil, variety, method of cultivation, liability to disease, 

 and attack of insect enemies. 



The quality of wheat may be affected by the cli- 

 mate, as is evidenced by the difference between the 

 hard spring wheats of Dakota and the soft winter 

 wheats of Washington. Richardson found one sample 

 from Dakota to contain eighteen per cent of albumin- 

 oids while one from Washington contained only 

 7.7 per cent of albuminoids. Differences exist else- 

 where, but in a less marked degree. It has been 

 shown that the climate of Colorado modifies the qual- 

 ity of wheat brought from other climates. Climate 

 and soil, however, are intimately connected, so that it 

 may be laid down as a rule that localities having 

 widely different climate and soil produce their pecu- 

 liar varieties and modify those which are brought to 

 them. It is believed by some that the annual renewal 

 of the seed from a desirable and favorable source 

 often makes it possible to raise cereals where other- 

 wise the climate and other unfavorable conditions 

 would render their profitable cultivation impossible 

 through reversion. 



According to the tenth census of the United States 

 seventy per cent of the wheat of the United States was 

 grown where the average January temperature was 



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