88 



EXPERIMENT STATION RECORD. 



[Vol. 36 



article describes tlie metliods and cost of making a snow survey, made in 

 cooperation witli the Weather Bureau of the U. S. Department of Agriculture, 

 and reports the data obtained. 



Subirrigation, A. P. Spencee and C. M. Beery {Univ. Fla. Div. Agr. Ext. Bui. 

 5 (1916), pp. 12, figs. 8). — This circular describes and illustrates methods of 

 subirrigation employed in Florida in artesian areas. 



The essentials for successful subirrigation are enumerated as (1) an abundant 

 supply of water, (2) a subsoil or floor composed of clay, marl, or hardpan 

 located at a depth of from 3 to 5 ft. below the surface to hold the water and 

 prevent its escape downward; (3) a foot or more of coarse sand on top of the 

 subsoil or bottom of the irrigated depth that will readily absorb and distribute 

 evenly the water to be used in grading the artificial water table; (4) a topsoil 

 of sandy loan tliat is neither too porous nor too compact and which will 

 convey the water freely by capillary attraction: (5) land that admits perfect 

 drainage [and has] a fall of about 1 in. to 100 ft.; and (6) land that is level, 

 without depressions or raised places. 



" Wherever the foregoing conditions obtain and wherever the crops to be 

 grown justify it, subirrigation should give satisfactory results, but with any 

 one of these essentials lacking it is not likely to give satisfaction. The system 

 also supplies drainage and aeration." 



In the construction of a system a water main with supply pockets is located 

 on the high side of a field. The supply pockets feed tlie irrigation tile which 

 drain into stop pockets at the low side of the field which are connected with a 

 drain. 



Cost of pumping for irrigation, O. L. Waller {Washington Sta. Popular Bui. 

 10-i {1916}. pp. 11). — This bulletin gives brief directi<»ns for the designing of an 

 irrigation pumping plant and estimating the cost of plant and of pumping 

 water, together with experimental data on the use of fuel or electricity in 

 pumping. 



The following table shows the number of gallons of gasoline, distillate, or 

 crude oil and the kilowatt hour., of electrical energy used under average farm 

 conditions and practice to lift 1 acre-foot of water 1 ft. high. 



Fuel and electricity used for irrigation pumping. 



Gallons of gasoline, distillate, or crude oil used 



Kilowatt hours of electric 

 current used. 



A list of 10 references to literature bearing on the subject is appenrled. 



