THE USE OF MANURES 171 



7. 5 cwt. super., 1J cwt. nitrate of 

 soda, 5 cwt. kainit. 



8. 5 cwt. super., 2 cwt. nitrate of soda, 

 5 cwt. kainit. 



9. 5 cwt. super., 1 cwt. nitrate of soda, 

 7 1 cwt, kainit. 



10. 5 cwt. super., 1 cwt. nitrate of soda, 

 10 cwt. kainit. 



By comparing plots 4, 2, 7, and 8, in the 

 order named, we get information with regard 

 to the effects of increasing quantities of 

 nitrate of soda ; and similarly by comparing 

 plots 5, 2, 9, and 10, in the order given, 

 information will be forthcoming with regard 

 to the profitable limit in the use of kainit. 



Instead of, or in addition to, ascertaining 

 the most profitable quantity of these three 

 ingredients, we might after plot 5, or after 

 plot 10 proceed to put down additional 

 plots, with the object of discovering the 

 relative effects of superphosphate and basic 

 slag, or of nitrate of soda and sulphate of 

 ammonia, or of kainit and muriate of potash. 

 To compare the relative effects of super- 

 phosphate and basic slag we could add a plot 

 receiving basic slag, equal in money-value 

 to 5 cwt. superphosphate, and when this plot 

 is compared with plot 2, the comparative 



