﻿IRRIGATION AT UNIVERSITY FARM, DAVIS, CAL. 



11 



Season of 1911. — The experiment was repeated in 11)11 on the same 

 soil, following as nearly as possible the procedure of 1910, the land 

 being spring - plowed and seeded on March 20. 



The following schedule was followed during the season : 



Schedule of irrigation, I'M I. 



Number of plat. 



Number of 

 irrigations. 



Date. 



Depth 

 applied. 









Inches. 





One 



...do 



June 1 

 May 13 

 ...do.... 



6.4 



36 



4.3 



37 1 



...do 



6.0 



35 



Two 



/..do.... 

 \May 27 



4.3 





2.7 



1 Green manured. 



Following the seeding the weather remained cold, and at the time 

 of the first irrigation, on May 13, 54 days after seeding, the grain 

 stood at an average height of only 6 inches. The second irrigation 

 was applied to plat 35 just as it was coming into the head. 



On June 1 the unleveled area was divided into two plats, and the 

 south plat flooded to a depth of 6.1 inches. At this time the grain had 

 just come into the head and w T as beginning to show indications of a 

 lack of moisture. In irrigating the remaining plats (35, 36, and 37) 

 the water was applied at a time when it was thought it would pro- 

 duce the best results. 



Season of 1912. — Following the harvesting of the grain in 1911, 

 checks 35, 36, and 37 were irrigated and plowed, and on July 22 

 planted to cowpeas of the Clay variety. Early in November these 

 were turned under as green manure. 



February 3, 1912 ; these checks, as well as the unleveled area to the 

 north, w r ere plowed, harrowed, and seeded, using the same variety of 

 seed, quantity, and method of seeding as in the previous two years. 



Schedule of irrigation, 1912. 



Number of plat. 



Number of irrigations. 



Date. 



Depth 

 applied. 









Inches. 



351 



do 





361 



One 





Apr. 24 

 /Apr. 17 

 \May 8 



7.35 



371 



Two 





12.00 









5.95 



1 Green manured. 



It will be noticed that much heavier irrigations were applied here 

 than in the other two seasons. In all cases sufficient water was added 

 to give the soil a thorough wetting. The green manure seemed to pro- 

 duce a loose, porous soil which rapidly took up the water as it was 

 applied. This condition will be noticed also in plat 37 of 1911, when 

 6.03 inches were added, as against 1.3 inches to the unmanured checks. 



