FIELD TESTS ARE BEST 361 



t 



/Vo treat vnent 



ACfd phoBphafs. 



Mar I ate of t pofcf^h 



/Vo treat\mGnf 



6 Nitrate of tsocfof 



Ac Id phos,phaT(2. arf^\ m/trctte. of so^fot 



7 A/o tr&at )ment 



Add pho^p^ate. ah/^ mur/atis. of potash 



Muriate of potash and titrate of s>oda 



^0 No treat m ent 



// Acid phosphate^ potash, u^nd n/trate of ^oc{a 



/Z Acia( phosphate^ potash ^ vsnd rufrate of jso^a 



/5 Afo treat ^fnent 



14 T^hojSphaf^ , potash and lyjjtmfe of so^a To corn ati4 \y^ eat 



/S *f " ,t \ n I „ 't wheat 



/^ No trGatt^&nt 



^7 StamG as N hut rnare pAoxSp/tate anat fe^iS r^tk-ates 



/S Manure^ 9 tons on , corn o^^ j^Aeat 



/f No treatlm&rrt' 



Zo ManiAre. . -f ton& or\\ corn, a^^ft /vheat 



-2/ ^d^me <^^3 /7 hut h/tro^e^ m oilmeail 



ZZ No treafymsJit 



2.Z Same gjs. /7 ^ hut nitro^^en /n dri^sd jb/oo<d 



Z4 Sofme a^ /? J hut nitrol^^^ //) Sifjphate g/nmo/j/g 



^s A/o treatment 



Zh SaryfB as // , huf pho^phari/s //j lone meat 



^7 Same as /?, hut m'tVoqerj m n/frafe of //^e 



2.S A/o treatment 



_£f :Same as //, hirt phqsp/iorus /a Sas/'c sja^ 



^0 %ams. a& /7, hi^t n/t^o^ en Jr? ta/7kaqis 



"• > ' ' " III I ■ > « J "» l «'l 11 II I——— I— I » . in • 



Lime. Afo ///^<s. 



Fia. 227. — ^A series of expenmental plots. (Ohio Station ) (See Fig 229 ) 



