Show I lbs IBs Ot 01 Water To Mak Makel 1 Ib lb Hay HayTo To make 1 pound of or dry alfalfa to absorb absorb ab ab- need the tho growing plants JIa nay transpire and later give oft off or Irom to pounds of or water Irrigation engin engineers ers use the term transpiration ratio and say aay that transpiration ratio o orom oi of 11 has 8 a a. rom fOUl Suu to the smaller ratio climax and the or tor a cool moist most Burger for hotter dryer sections Phrasing it another way engineers engine engine- ers r of the United States Department of or Agriculture find tind that to produce I 0 r. tons lons of dry alfalfa hay an acre in western Oregon about 20 inches acre-inches ot ut water a a. year will be dial Is the alfalfa will remove from would be ho w sue tac soil OIl as us much water as needed to cover the held field to a depth of 20 inches allowing only a moderate moderate moderate mod mod- erate II quantity for direct evaporation from the soil In the Valley of Oreon Oreon Ore- Ore on for example ac according to M. M R R. R Lewis of the Bureau of Agricultural ii the 20 inches incites of water required might bo ho made U uj up of 7 I aches stored in the soil from winter rains 3 inches from rains occurring in the growing season and 10 inches supplied by br irrigation The proportions proportions proportions would vary with the season In more arid regions alfalfa may need as much as 30 inches of water or even more to produce 5 tons of ot dr dry hay pr 11 acre because the demands for both evaporation and tion are gr greater ter To j produce ann annually annually an an- n such crops as are raised in some sections say S 8 or 10 tons an acre the requirement will be roughly rough rough- ly proportional to that for far the ton 5 crop in eastern Oregon DIfferent Different crops vary widely in their water In a. a section where it takes about 20 inches acre-inches to grow a ton 5 crop of alfalfa an acre it has been found that it takes 12 inches for corn or beets about 16 inches for potatoes and and only I about 9 inches for white beans If It Ifa Ifa Ita I a crop does not get its full proper transpiration ration It will not manufacture manufacture manufacture manu manu- facture its full quota of ot marketable prod product |