262 TALKS ON MANURES. 



The following are some of the results in 1869 : 



Bushels per acre. 

 1. No manure 1V6 



(4 cwt. superphosphate "1 

 f " sulphate of magnesia l qnft 

 2 " muriate of potash (' 

 2 " sulphate of ammonia J 



3. 4 cwt. superphosphate 189 



A j 4 cwt. superphosphate j rn1 



* | 2 " sulphate of ammonia p ul 



( 4 cwt. superphosphate j 



5.-J2 " muriate of potash V340 



(2 " sulphate of ammonia ) 



fi { 4 cwt. superphosphate [ OJO 



b -12 " muriate of potash f 5 * 



"This is a very interesting experiment," said the Doctor. 

 "Superphosphate alone gives an increase of thirteen bushels. 

 Superphosphate and potash an increase of seventy-three bushels. 

 The potash, therefore, gives an increase of sixty bushels. Super- 

 phosphate and ammonia give twelve bushels more than superphos- 

 phate 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 above experiments were repeated on the same land, 

 with the same general results. 



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

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

 lowing are the results : 



Bushels per acre. 



1 ( 9 cwt. superphosphate \-\QR 



10 1 8 " sulphate of ammonia J ic 



( 9 cwt. superphosphate . 

 !.-< 3i " muriate of i 



2. -j 3i " muriate of potash V-204 



( 3 " sulphate of ammonia ) 



3. No manure 70 



{9 cwt. superphosphate ) 

 3i " muriate of potash 1 J-205 

 3 " sulphate of ammonia ) 



5. 20 tons farm-yard manure 197 



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

 phosphate gave an increase of 116 bushels per acre; and 3 hun- 

 dred weight of muriate of potash an increase, on one plot, of 

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



In the same year, 1871, another set of experiments was made on 

 a better and more loamy soil, which had bsen in grass for several 

 years. In 1369 it was sown for hay, and in 1870 was broken up 

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

 some of the results: 



