SUMMARY 27 



and as well the shade from the foliage of the plants, the loss 

 from evaporation in surface irrigation is greatly lessened. 



7. The percentage of water saved in sub-irrigation out of 

 doors is greatly reduced on account of its soaking oft' in the soil 

 below. 



8. The fact that the tiles are out of sight and their action 

 unknown makes ordinary sub-irrigation a little uncertain. 



9. Sub-irrigation out of doors, where it works well, is an 

 ideal system of watering. 



10. If possible have a good pressure or fall. 



11. Experiments for two seasons have shown that when the 

 tiles were placed near the surface of the ground, the plants 

 did fully as well as in the other systems and with less water. 



12. By placing the tiles near the surface, the great loss by 

 evaporation was overcome. This system also placed the water 

 where even the shallow-rooted plants could not fail to receive 

 it. It also combined all the good points of deeper sub-irri- 

 gation. 



13. Three thousand six hundred and thirty cubic feet, or 

 about eight hundred barrels, of water is the amount estimated 

 to cover one acre of ground to a depth of one inch, — the amount 

 recommended per acre for reservoir capacity. 



14. Onion seed sown upon upland, with and without irriga- 

 tion, gave marked results in favor of irrigation. 



15. To get the best results cultivation goes hand in hand with 

 irrigation. 



16. Mulching and sub-soiling are milder forms of irrigation 

 which can be resorted to with good results to counteract drouth. 



17. Many soils need drainage, perhaps, rather than irrigation, 

 while in some others there is a medium, which gives best 

 results. 



18. Under existing climatic and meteorological conditions, 

 irrigation solves a very discouraging problem. 



