2 12 



and all three together; the bouihl.uk aud umiiate of potash combined 

 in the same amounts were used with 320 pounds and ifM) pounds of 

 nitrate of soda aud 120 ]K)unds of sulphate' of ammonia, resi)ectively; 

 muriate of potash and nitrate of soda, 100 pounds each, were used with 

 .■>()() pounds of dissolved South Carolina rock and 400 pounds of grouiul 

 Thomas slaj;'. respectively; and barnyard manure 8 tons and linseed 

 meal 1,800 pounds were eadi used on one jtlat. Each plat received the 

 same fertilizers as in the jireccdiMji- year: and as before, 8 plats rt-maiucd 

 uumanured. 



Penquite Velvet Chatlwlicat was sown on all the jilats the last of 

 September in each year, the fertilizers beinj;; api)lied broadcast Just 

 l»efore seeding, except the nitrate of soda, wliidi was apidied the ft»l- 

 lowin<j April. 



An »'\i>tMiin<'ut on a similar ])lan was made in Columbiana County in 

 1.s;m>. 



Tiu' results of all tiiree experiineuts are tabulated and discussed, aiul 

 relereiu-e is made to the Kothamste(l experiments witii fertilizers ibr 

 wheat. The results are also rejtorted of a trial at the station in whieh 

 wheat was grown in a rotation, bcjui; i>re('e(le(i liy corn aiul <»ats. The 

 authors' conebisi(uis from tiu' sev«'ral e\]»eriments follow: 



In 181(0 the vaiions iLilili/.i-rs used niuductd in every case some iiurease of croi*. 

 Wlu'U nitrate of soda was used alone its eost was recovered in the inireas*' ol" erop. 

 conntin't wheat at $1 per bushel, but in no other case in the station test was the 

 cost of any of the fertilizers or combinations of fertilizers recovered, except in that 

 of barnyard manure. 



In the test in Columbiana County llie imriase of cro]) on jilat L' ajiitaveutly justi- 

 lied the use of sni)erphosphate, l>ut this increase was not rontirmed by the dupli- 

 cate ])lats ,') and S; hence we are led to doubt whether this increase may not have 

 been due to the natural superiority in the soil of this plat. In f^encral the fertilizers 

 added less to the unaided yielil of the Columbiana County soil than they did to that 

 of tlie station soil, uotwilhstandinij the fact that the unfertilized plats on the sta- 

 tion farm yielded twice as much wheat on an averajje as ditl those on the farm in 

 Columbiana County. 



In the tests of 1S91 at the station the fertilizers have in every case caused a decrease 

 of crop where superidiosphate was used. Nitrate of soda, alone or with potash, has 

 produced a slijiht increase; but in no case has the increase been snHicient to justify 

 the use of the fertilizer, and this applies both to the wheat jjrown continuously on 

 the same soil aud to that grown in rotation. 



In the tests of 1891 the wheat grown in rotation without fertilizers has yielded as 

 large an average crop as the best obtained from the Jise of the fertilizers in 1890, 

 although the yield from the unfertilized plats under continuous cropping was ])rac- 

 t ically the same in both seasons. 



S03ll': FERTILIZING MATERIALS AND THEIR l^SES, C. E. ThORNE AND 



.1. I'\ Hickman, M. S. A. (p]). 71-70). — A popular discussion of thecom- 

 nu'icial sources of nitr(»geu, [)hosphoric acid, and potash, and the use of 

 ihese various materials. 



