262 TALKS ON MANURES. 



The following are some of the results in 1869 : 



Bushels per acre. 

 1. No munurc *. 176 



(4 cwt. superphosphate "1 

 } " eulphate of majjnesia lo^^ 

 2 " muriate of potash f*'^ 

 2 " sulphate of ammonia J 



3. 4 cwt. 8U|)erpliosphate 189 



_. ( 4 cwt. superphospliate ) oqi 



(2 " sulphate of ammonia j 



( 4 cwt. 8uper|)hosphate i 



5. -(2 " muriate of potash >-340 



(2 " 8uli>hate of ammonia ) 



g ( 4 cwt. 8Uiierpho.sphale [ oig 



■j2 " muriate of potash j 



"Tlii.'? is a very interesting experiment," said the Doctor. 

 "Siipcrpliospliate alone gives an increase of thirtct'n husliels. 

 Siipcrpliospliato and potash an increase of seventy-three bushels. 

 The potash, tliereforc, gives an inirease of si.xly bushels. Super- 

 phospliate n/id ammonia give twelve bushels more than superphos- 

 pliatc alone, and the reason it does not produce a better crop is 

 owing to a deficiency of potash. When this is supplied the am- 

 monia gives an increase (plots 5 and 6) of ninety-one bushels per 

 acre." 



In 1870 the aliove experiments were repeated on the same land, 

 with the same genenil results. 



In 1871 some cxperiinenis were made on a sharp, gravelly soil, 

 wliicli had been over-cropped, and was in poor condition. The fol- 

 lowing are the results: — 



Busfich prr acre. 



, j 9 cwt. superphosphate ( , o- 



■|3 " sulphate of ammonia f ^ 



9 ewt. su[)erphospliatc. 



( 9 ewt. su[)erphospliatc i 



2. < 31 " muriate of pota.sh 1204 



(3 " sulpliite of ammonia ) 



3. No manure 70 



{ 9 ewt. supcrpho.sphate ) 



4. -j 3i " muriate of pota.sti 1205 



(3 " sulphate of ammonia ) 



5. 20 tons farm-yard manure 197 



" On this poor soil," said the Doctor, " the ammonia and super- 

 pliospiiate gave an increase of IIG bushels per acre; and 3^ hun- 

 dred weight of muriate of potash an increa.se, on one plot, of 

 eighteen bushels, and on the other nineteen bushels per acre." 



In tiic same year, 1S71, another set of e.xperiments was made on 

 a better and more loamy soil, which had been in trra.ss for several 

 years. In 136!) it was sown for hay, and in 1870 was broken up 

 and sown to oats, and the next spring planted with potatoes. The 

 following are some of the results : 



