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Show !M PIANS FO SIIR-IRRtflATinrV Most Practical Method Found la Where Ditches Are Dug Just at for Laying Tile. (By W. H. LAT7CK, Irrigation Invi-stlR. tlon. United Mate Department of Agriculture.) Agri-culture.) Sub-Irrigation by means of tle will bear Investigation under the different conditions encountered In tho dry laud districts. Tho Ideal conditions for sub-Irrigation is where a hard-pan or Impervious stratum Is found underneath under-neath 18 to 3C Inches of soil, In which capillary attraction Is good, and Just to tho extent that the conditions approach ap-proach this Ideal Ib it a success for growing annuals. The roots of perennial peren-nial crops will eventually clog the tile ' In their search for moisture. A small plot of one-half acre, with tile laid at I different distances apart, viz.: 10, 1G, i 20, 25 and 30 feet apart, will, after a I series of years determine the proper i spacing of sub-Irrigation tllo systems for the soil. The most practical meth nd of eub-lrrlgatlon that tho writer has found Is whero ditches were dug Just as for laying tile, and filled In with from three to six Inches of cinders with a pleco of tile sot on end In the ditch on the cinders for npplylng the water, after which the soil was filled in over the cinders. This is inexpensive, inexpen-sive, compared with other methods, If a supply of cinders Is available. |