140 The Rothamsted Grass Experiments. 



superphosphate of lime and ammonia- salts, 1859, and each 

 year since. 



Plot 5. Ammonia-salts alone, every year. 



Plot 6. Ammonia-salts 13 years, 1856-68 (with sawdust 

 7 years, without effect) ; sulphates of potash, soda, and 

 magnesia, and superphosphate of lime, 1869, and each year 

 since. 



Plot 7. Sulphates of potash, soda, and magnesia, and 

 superphosphate of lime, every year. 



Plot 8. Same as plot 7 for 6 years, 1856-61 ; sulphates 

 of soda and magnesia (without potash), and superphosphate 

 of lime, 1862, and each year since ; also sawdust the first 

 7 years (without effect). 



Plot. 9. Sulphates of potash, soda, and magnesia, and 

 superphosphate of lime (as plot 7) and ammonia- salts, every 

 year. 



Plot 10. Sulphates of potash, soda, and magnesia, and 

 superphosphate of lime (as plots 7 and 8), and ammonia- 

 salts, 6 years, 1856-61 ; sulphates of soda and magnesia 

 (without potash) and superphosphate of lime (as plot 8), and 

 ammonia- salts, 1862, and each year since; also sawdust the 

 first 7 years (without effect). 



Plot Ha. Sulphates of potash, soda, and magnesia, and 

 superphosphate of lime (as plots 7 and 9), every year ; twice 

 as much ammonia-salts as plot 9, 3 years, 1856-58 ; same 

 ammonia-salts as plot 9, 3 years, 1859-61 ; double quantity 

 again, 1862, and each year since. 



Plot life. The same as plot Ha, with the addition of a 

 mixture of silicate of lime and silicate of soda, 9 years, 

 1862-70, and of silicate of soda only, 1871, and each year since. 



Plot 12. Unmanured, every year, 1856, and since (as 

 plot 3). 



Plot 13. Sulphates of potash, soda, and magnesia, and 

 superphosphate of lime, and ammonia- salts (as plot 9), and 

 cut wheat straw, every year. 



Plot 14. Sulphates of potash, soda, and magnesia, and 



