Ammonia-salts and Minerals, with and without Potash. 175 



13. 400/&. Ammonia-salts, and Mixed Mineral Manure, with 

 and without Potash : Plots 9 and 10. During the first six 

 years of the twenty both plots annually received 4001b. of 

 ammonia- salts and the " mixed mineral manure," including' 

 potash. Plot 10 received 20001b. sawdust per acre per annum 

 during those six years, and again in the seventh year, but 

 without effect. After the first six years both plots were 

 manured as before, with the important exception that, from 

 that date the potash was omitted from the manure of plot 10, 

 and a somewhat increased amount of sulphate of soda was 

 applied instead. The results are summarised in Table 

 XLIII. 



TABLE XLIII. AVEEAGE PER ACRE PER ANNUM, BY 400LB. AMMONIA- 

 SALTS, AND MIXED MINERAL MANURE, WITH AND WITHOUT POTASH 

 PLOTS 9 AND 10. 



