324 Twelfth Annual Report. 



plated on the streams supplying the Salt river valley with wa- 

 ter. The results of the study indicated that the estimated area 

 that could be watered from these prospective reservoirs was some- 

 what too high, and that the water-shed of the Salt river and its 

 tributaries does not supply water enough to irrigate thoroughly 

 over 250,000 acres, just about the area under the present canal 

 systems of the Salt river valley. It is the purpose of the writer 

 to present in a bulletin during the coming year the results of the 

 study that lead to the above conclusions. 



The experiment in the winter irrigation of orchards was con- 

 tinued through the year, and a bulletin embodying the results of 

 the past two and one-half years' experiments issued last May. 

 Work is under way during the present season having for a pur- 

 pose the determination of the amount of the winter-applied water 

 that is used by the trees and the amount that is lost by evapora- 

 tion from the soil. Experiments have also been made in irriga- 

 ting strawberries by different methods but the work has not been 

 continued long enough yet to indicate clearly what the results 

 are to be. 



Especial attention has been given to the study of the duty of 

 water. All the water flowing upon the Station farm has been 

 measured as it crossed the farm line, and the amount applied to 

 each crop has also been measured. For this purpose a self-re- 

 cording water register was installed in the ditch conducting water 

 to the farm, and gauged measuring boxes were placed wherever 

 needed in the ditches conducting water to the various parts of the 

 farm. A record has been kept of the length of time water flowed 

 through any particular box upon any particular crop, the depth 

 of the stream in the box noted, and the quantity of water applied 

 at each irrigation thus determined. A record of the yield of each 

 crop has also been kept, and so far as practicable a record of the 

 cash return, or at least the cash value, of each crop. A bul- 

 letin embodying the results of these experiments is contem- 

 plated for the future. 



RELATION OF TEMPERATURES TO CROPS. 



During the past two years quite careful observations have 

 been made and complete records kept of the effect of high and of 



