212 TALKS Oy MAN L' RES. 



Mixed mineral manures and 100 lbs. ammonia-salts, on plots 21 

 and 22, give 23^- busiiels per acre. In other words : 



25 lbs. ammonia (100 lbs. ammonia-salts), gives an increase of 4i bush. 



50 " " (:iOO " " " ), " " " " 10 " 



100 " " (400 " " " ), " " " " 20 '• 



l.jO " ' (60(J " " " ), " " " " 23 " 



200 " " (SOO " " " ), •' " " " 23 " 



"It takes," said the Deacon, "about 5 lbs. of ammonia to pro- 

 duce a bushel of wheat. And accordmij to this, 500 lbs. of Peru 

 vian guano, guaranteed to contain 10 per cent of ammonia, would 

 give an increase of 10 bushels of wheat." 



"This is a very intcrestmg matter," said I, "but we will not 

 discuss it at present. Let us continue the examination of the sub- 

 ject. 1 do not propose to make many remarks on the tables. You 

 must study them for yourself. I have spent hours and days and 

 weeks making and pondering over these tables. The more you 

 study them the more interestmg and instructive thry become." 



The sixteenth season (1858-9), gives us a little over ISj bushels 

 on the unmanurcd plot. On the plot manured with 14 tons farm- 

 yard manure, 36i bushels; and this is Ihe highest yield this season 

 in the wheat-field. Mixed mineral manures alone, (mean of plot 

 5a and 5b), give 20i bushels. 



25 lbs. amnioni:i (100 lbs. ammonia-salts), and mixed minerals, 

 give 25J bushels, or an increase over minerals alone of 4f bushels. 



."iO lbs. ammonia, an increase of 9i bushels. 



100 " " " " " 14 " 



1.50 " " " •' " 14 *• 



200 " " " " " 14i " 



The season was an unfavorable one for excessive manuring. It 

 •was too wet and the crops of wheat when hiirhly manured were 

 much laid. Tlie quality of the grain was inferior, as will be seen 

 from the light weight per busliel. 



The seventeenth season (1859-60,) gives less than 13 bushels per 

 acre on the unmanured plot; and 321 bushels on tiie plot ma- 

 nured with 14 tons farm-yard manure. This season (1860), was a 

 luserable year for wheat in England. It was both cold and wet. 

 Mixed mineral manures, on plots 5a and 56, gave nearly 16 bushels 

 per acre. 25 lbs. ammonia, in addition to the above, gave less 

 than 15 bushels. In other words it gave no tnnrnse at all. 



50 lbs. ammonia, gave an inrrrase of 6 bushels. 

 100 " " " " " " n* 



i:,9 " " » " " " lai » 



200 " " " " " " lt)J " 



It was a poor year for the wheat-grower, and that, whether he 

 manure 1 ox 'Cpsivcly, liberally, moderately, or not at all. 



