Show WATER FOR CROP PROTECTION Requirement Increases Increaser With Higher Temperature and a Greater Amount of Sunshine By D D. D W. W FREAR FREAK Colorado Agricultural College Various investigators have found round that it requires from about to 1000 pounds of water to produce a n pound of dry matter of farm crop The water requirement Increase with a higher temperature a greater amount of sunshine and a dryer atmosphere In the arid regions a moderately high temperature a cloudless sky and a dry atmosphere prevail Consequently the water requirements of plants naturally naturally naturally nat nat- tend to be higher for the same kinds o of crops It is concluded that about pounds of water are required required re re- in the arid regions for the production of one pound of dry matter of common farm trope crops The straw forms Corms about one half atthe of at the total weight of harvested grain On this basis the total weight of straw and grain for every bushel of wheat is pounds About 90 per percent cent of this or pounds is dry mat mat- ter Therefore It will require times or pounds ot- ot water of-water water to mature one bushel of wheat This Is equal to 40 t tons ions ns of water One Inch of rainfall per acre weighs approximately tons It is ed cd that under r good tillage methods about two-fifths two of the total rainfall is available to the crop therefore about tons of every acre inch of 01 rainfall are used by the plants and andone andone one ono inch of rainfall can an produce about 1 s 11 bushels of wheat Under these conditions ten inches of ot rainfall would produce 11 1114 bushels 15 inches 17 bushels Where Where two years years' ars' ars precipitation tion is stored in the the soil sou it will be possible possible pos pOSe sible to produce about 27 bushels of ot wheat per acre on a inch 12 rain rainfall Call Efficiency of ot conservation and actual actual actual ac ac- ac- ac water requirements ments of plants vary so much in different se sections that for many localities the above figures fig figures ures must necessarily be suggestive rather than actual |