CHAPTER V 

 RELATION OF CLIMATIC FACTORS TO GROWTH 



The ability of corn to yield is indicated by certain max- 

 imum yields that have been obtained under favorable 

 conditions. Edward Enfield,^ in 1866, listed a number of 

 record yields which had been published between 1840 

 and 1866. 



45. The average of fourteen record yields collected from 

 seven States was 145 bushels per acre, two of these records 

 being 200 bushels per acre. The American Agriculturist ^ 

 records in 1857 a yield of 857| bushels on 5 acres, or an 

 average yield of 171^ bushels per acre. Hartley ' reports 

 a 90-acre field of corn in Pennsylvania averaging 130 

 bushels per acre, the same farmer having averaged 100 

 bushels per acre for twelve years. The four largest 

 yields on record are as follows : — 



(a) This record has often been mentioned, but original data to verify 

 it are not available, (b) and (c) These records and the method of grow- 

 ing are given in The American Agriculturist, XLIX, March, 1890, p. 122. 

 In each case the jrield is field weight at husking and would have., to be 

 reduced at least 10 per cent for crib dry weight, (d) Field weight. ' 



' Enfield, Edward. (1866.) Indian Corn, p. 54. "' 



2 The American Agriculturist, XVI : 238. 1857. 

 « Habtlet, C. p. (1910.) U. S. Dept. Agr., Farmers' Bui. 4.14 : 14. 



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