﻿18 BULLETIN 10, U. S. DEPARTMENT OP AGRICULTURE. 



The following plan of irrigation was outlined and carried out 



Schedule of irrigation of {/ruin following alfalfa in W12. 

 OATS. 



Number of plat. 



Number of irrigations. 



Date. 



Depth. 



Status of oats. 



32 ... 







Inches. 





33 



One 



April 9 

 /April 13... 

 iMay 10.... 



13.2 

 13.2 

 7.2 



Oats 12 inches high. 



34 



Two 



Do. 







Oats heading out. 



WHEAT. 



32 











33 



One 



April 25... 

 /April 15... 

 \May9 



10.00 

 9.15 

 8.40 



Wheat 24 inches high. 

 Wheat 18 inches high. 



34 



Two 







Wheat coming into full head. 



In each irrigation water was added at a time when it was thought 

 that the best results would be obtained, and in no case was irriga- 

 tion delayed until the crop was suffer- 

 ing for moisture. It will be noticed 

 that in all cases large amounts of 

 water were used. This was necessary 

 in order to cover the checks completely 

 and was due to the open, porous con- 

 dition of the soil, the result of turn- 

 ing under the green manure. 



Early in June, just before harvest- 

 ing, several days of heavy north wind 

 occurred, badly shattering both crops, 

 and it was estimated that 30 to 40 per 

 cent of the grain was lost. This loss 

 is not included in the table of yields. 

 June 15 all plats were cut with a 

 binder, stacked in the field, and later 

 thrashed with a stationary thrasher. 



The table following shows the yields 

 in hay and grain in pounds per acre, 

 the quantity of water applied, and the 

 cost of irrigation. The accompanying 

 diagram (fig. 6) shows the yields of grain platted with the corre- 

 sponding amounts of water applied to each check. 





Oj^ts Wheat 



WATER APPLIED.-1NCHES 



O 



13.2 



204 



o 



10 



18.4- 



2000 



1800 



£1600 



o 



< 1400 



CE 



UJ 



a l200 

 m 

 o 

 ziooo 



Z> 

 o 



^800 



3600 



>4.00 



200 





























































































c: 



<0 



c: 





c; 



<0 



-!- 

 4 















1 



1 





1 





•N 



CM 





v. 



C\i 







Fig. 6. — Yield of oats and wheat, 

 with different quantities of water. 



