2 BULLETIN" 228, U. S. DEPARTMENT OF AGRICULTURE. 



until the time of the second cutting (fig. 2). Both sets were then 

 allowed to grow uninterruptedly until the third and final cutting was 



Fig. 1. — Alfalfa (series B, pots 145 to 150), photographed just before cropping, September 7, 1912. 



made. The data for the individual pots will be found in Table I, 

 where the results are also summarized. 



RESULTS. 



The water requirement of the two series during the first period 

 (i. e., up to the time of the first cutting) was practically the same. 













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Fig. 2.— Alfalfa (series A, pots 133 to 13S), photographed jusl before the second cropping, September G, 



1912. 



The mean ratio of the six pots of series A (check) was 600 ± 17 and 

 of series B 615 ±0. The difference is less than the probable error. 



