26 SURFACE- AND SUB-IRRIGATION 



LITERATURE ON IRRIGATION 



For general literature on this subject, see The Third Annual 

 Report of the Colorado Agricultural Experiment Station, 

 1S90, pp. 78,79, which gives a list of 71 works on irrigation 

 with brief comments on the character and the scope of each j 

 also for statistics and cost of irrigation works, same report, pp. 

 71-78. 



More or less has been done in other states, as for example r 

 California, Nebraska, Arizona, Utah, Wyoming, Louisiana, 

 Wisconsin, Kansas, and New Jersey, reports of which may be 

 found in the Experiment Station bulletins. 



ACKNOWLEDGMENTS 



Figures 7 and 8 were loaned me by Dr. J. A. Myers, 

 Director of the West Virginia Experiment Station ; also the 

 photographs from which Figures 5 and 6 were made ; Figure 4, 

 from the Orange Judd Co. 



SUMMARY REMARKS 



i. We irrigate because we are compelled to in order to se- 

 cure the best conditions for raising crops in a dry season. 



2. Apply enough water when irrigating to do some good ; a 

 pailful applied now and then in a dry time is useless. 



3. By being able to irrigate when a crop is nearly matured, 

 we have a first-class crop, where otherwise would be an infer- 

 ior one. 



4. Ground beds in the forcing house, watered from the same 

 row of tiles, with all conditions the same excepting that part 

 of the bed had a water-tight bottom while the remainder did 

 not, gave good results in the former case and very poor in the 

 latter. 



5. Experiments with celery upon a clay loam, with water 

 applied both through ditches for surface irrigation, and through 

 tiles below the reach of the plow for sub-irrigation, showed that 

 the latter system required much more water than the former 

 for the same results. 



6. By taking advantage of the cloudy portions of the day 



