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Show H DRY FARMING. B Thje Amount of water Required H by Plant. 1 N'ttmorOMA experiments huvo been B conducted todetp'rinlno the amount-of HL, water required ( produce? ono pound H of dry inuttor. It Uurtimlly done by H (Trowing diileront plunin In large vain', H from tltno to time eurofully weighed H , nrnountHof water nro added to ouch r PUU An neouriitn nooount of tlio wntor Hr lost, by ovnporation Ih kept mid at nm- fl turlry tho total dry matter In civuli xt B in weighed. Hy Hubtrnutlnir the amount H of witt or lost by evaporation from tho H tdtnl amount added to tho pol It oan B oatilly Undetermined )ow much water K In required for each pound of dry mat- A llttlo thought will bring ono to the B conclusion that tho amount of water H reqtOrd for rau'i pound of dry nia'UT H In the t-nmo plant mav vary oonnldor U0 n bio according to dllTiyent Inlluennon Hl nfid condition! Tho tomporaluro, hit H mldlty and aridity of iho nttnoKphoro H will ouiso a variation In tho rate and H amount of trui'np:ru'lon from a plant H in a given lmgth of time. Tho amount Hr of water addod to tho noil In whluh the H' plant U growing will also influence tho H amount and rate of iratiflplratlon In a H given period, ft In alto true that dlf- L-- forent plantH require different amounts HT of water per pound of matured dry H mutter. The following tablet show L that thime throe KtutoincniH aro true. b Tim llrt tablo hIiow tho reaultH of ox V perlinon'H conducted by Wolluy, Hell- H i l'Jpge and Horauer In Oermauy. Tho H ' llguron represent the numbor of pounds Mf of wntdr required for one pound of dry H Wimliiy llellrlurfu Hormior Av H SI IS BIM5 B Oat tWS &9 5J6.M A Ji.uto;' ijln 07ii.5 HB nl 3SJ 2V' HPR Cora HI BW t Pel 410 37.1 .111.5 H i ut ciorcr aio aioo DHH Thene men worked under humid con- dltlniiH, Thoir iivcrugo Ih about 42.) HhwB 1 . ....'rho iiQXt lublo repreieutH King's re Hl 177 01 H Potatoes 38; i -''' """C .ro tho rennlts of Up. H Wlbnv r ..ud Professor Merrill h 1018 Hr Corn H8U ) m 'M ins R, Hugur boot (KIO H TIio.ho ruiultH wuro obtained under H arid a id hoiuI-hiIiI eondltlono. Tho M average U about Bill m'' In oon purl tig the tabled and also the avQiago, It 'Ut bu seen that there Is qoulderallo dtuoreuoo In tho moUmro B requlroineiUij q plants rowit in wet , . uountrhw and ijod tlma grown In dry HH':if eouiuilo.s A loi BUininora usually oo HJ our in an arid and HuutUarld ulstrletx, M It will also boHeou ihut the tempera HHpr turu Is an lutluenulng factor. In all of tho experiments eoudueted the water was added in rather a waste- g ful manner; that is, tho plants re given water frequently and In l.tre H aunaiuts It Is therefore rou-onuble to H sup use that thuy would hnvu used Ifss k MUj'' If onuomy h id been pruetloed H in warring them. TIuho results, H luvu, ojm lm o inslilerod h t'io maxU H uptai reqn reuumus of plants, H Noluo that, In thu llguivs quotei., V'.o thttdUfereiit plantH vary much In the H uiuount of moisture nees.sury to bring B tlvrm to maturity. Of thu pluni.s H iuuuul. corn seems to need the least. j Considoriug all things, though, it U B appruxlmatoly euireol toray that, un durarld amUnml-arid eoudltlons, 700 H ot' "M pounds of wator Is neoossury to B iiroduov Mini umiMreo'he pound of dry H UiUttur There wi.l ho u gradual vurb H a ton in tho un.tuint ae.oiiling to the B InlluttH-o of tli bti'oru immtd factors. H Having arrived at this eouoluslou it B Is only i mutheniatloal problem to du H tmunlie how iumoIi rainfall is no es- H sury to prtniuee .10 bushels of wheat an. j Mtmlly Uforitilng that, though" H two things will have to bo considered, H Flrt , i he u mount of straw hat sgiwn H in pruduetiig the bushel of wheat ' H Ootd authority y8 that, under dry funu eui.dltlous, 00 I s. of .-tin a- are D ji n iHTjduo il III produolng one luishel of j t whmit or ) lbs. The second thing to M OkmiM v Is thu Inoi that all of tlu mou- H Uiim wUt-U fulls oti'iuot b utilUel y H Ui plants ikMUo will rutii.tr .hesur M fno oj the r.iMod, mmiiu wll ovaiHnato M, treuUi totiatiiyhur LJut, n. M dwr inipttluj wluir.tl mvtods, one half M of the moitfUro whkih falls has been w bown by oxprftllfiotit to ho used by tho plants. Having ipd tboswdcdumlonH we are now randy to proflfd with the calculations. ' 7fi0 poun l of wii'cr will pro uee 1 pound of dry matter, th- K) x "50 equals -J.5,000 and thU tlm s 2, fir tho' straw, equu's 00 Ow pounds or niiuaint1 of water reqtiir d to nreduev una IhmIi-I el of wheat undor dry farm ..ndHlonn! and with to d eulturnl tnt'thodn To produco ,10 bimhels of wheai It will who .10 x 00,000 or 2,700,000 pound of water. Now I'ilnuh f rUlnfall on an aero of Innd weighs 2,72'2,Vott inninda Hut It Bhi-uld bo dlstlnutly VouiAinbered that only aho'.t half of tht ainonnt can bo saved for the uio of tio pi tilts, there fore, tho following fvstotn, whereby twoycais of molaiuro U Rtorod In tho ho), will huvo to bo lOtortoJ to. It is plain then that twelve 'nohow of raln fall will tiroduuo ;!() bu-hols of wheat every othoryoir, If proper inetlnds of cultivation ar pnujttaud k cncrve tlio moisture w.hloM fa'Jfl Under III tnolios of nilnfa'l only ift iushehi could bo raised If a were mora th n t2 IiicIhh, then more erniUl to r.iled pro portlonally As whort Isadfj farm crop which requlreBn(ierBgeaninunt of moisture, It folloMt that jro, s steh us barly, corn, oUitoos, onto and a variety of olhrs rmihl bo raised equally equal-ly fliteo ssessful wi h the mmo amount of rainfall, |
