1805.] 



PUBLIC DOCUMENT — No. 3;^. 



275 



inch of the top. To secure a thorough mixing of the fertil- 

 izer and soil, they were worked together with the sho\el 

 and the mixture sent twice through the screen. The addition 

 of the fertilizer to the soil was made two weeks in advance 

 of the seeding. A greater variety of fertilizer mixtures was 

 turned to account, including those of the preceding year. 

 The potassium oxide was furnished by nuiriate of potash 

 (1,2 and 3), sulphate of potash (4, 5, (3 and 12), carbonate 

 of potash-magnesia (7, 8, 9 and 10) and phosphate of potash 

 (11). The phosphoric acid was supplied by dissolved bone- 

 black (1, 2, 3, 4, 5, 7, 8 and 9), odorless phosphate (6), 

 double superphosphate (10), phosphate of potash (11) and 

 phosphate of ammonia (12). The nitrogen was added in 

 the form of nitrate of soda (1, 4, 7, 10 and 11), sulphate of 

 ammonia (2, 5 and 8), phosphate of ammonia (12) and 

 organic nitrogen (dried blood) (3, 6 and 9). The relative 

 ratio of essential fertilizing constituents applied was four 

 parts potassium oxide, one part phosphoric acid and one 

 part nitrogen. The percentage of the essential elements of 

 plant food applied to the soil in boxes 1-9 (inclusive) was 

 as follows : — 



Potassium oxide, 

 Phosphoric acid, 

 Nitrogen, . 



Tor Cent. 



.0U04 

 .0001 

 .0001 



The proportions for the remaining boxes are given 

 below : — 



