IQ07-] 



Problems in Potato Growing 



73 



The two nitrogenous manures were tried against each other in 

 two fields on my farm last season, with conflicting results, as 

 follows : — 



Manures. 



Total Yields per Acre. 



Field i. 



Field 2. 



4 cuts, superphosphate 



2 ,, muriate of potash 



2 ,, sulphate of ammonia ... 



4 ,, superphosphate ... 



2 ,, muriate <>f potash 



2 nitrate of soda ... 



Tons cwts. lb. 



| i " 



5 8 17 



Tons cwts. Lb. 

 ii i 57 



ii n 73 



It will be observed that equal quantities of the two nitro- 

 genous manures were used, the nitrate of soda containing the 

 smaller percentage of nitrogen and costing less than the sulphate 

 of ammonia. If the quantities had been adjusted to those of 

 nitrogen, it is probable that the nitrate would have come out 

 best in both fields, instead of in only one, as the potatoes in both 

 w ere second-eaiiies — British Queens. 



A great many trials of equivalent quantities of the three 

 ordinary potash manures have been published, and whereas 

 in nearly all kainil lias come out lowest, results in relation to 

 sulphate and muriate of potash have been conflicting. In 

 two of my own fields last season, and in one field in 1905, muriate 

 of potash proved greatly superior to sulphate, when used in 

 equal quantities with superphosphate and sulphate of ammonia, 

 a^ sh< >wn below : — 





Total Yields per Acre. 



Manures per Acre. 



1905. 



1 906. 





Field 1. 



Field 2. 



cwts. superphosphate 

 2 , , sulphate of amm< >nia 

 2 muriate of potash 

 4 superphosphate 

 2 ,, sulphate 01 ammonia 

 .'. Bulphate oi potash , 



Thus C\Vt>. It). 



J 9 10 8 



: 



Tons cwts. 11 >. 

 5 i> 12 



4 15 2S 



1 ons e\\ is. li>. 

 11 1 > 7 



10 13 36 



