Field Experiments in Manuring, 1903-4. 



589 



Thomas Phosphate. 



Phosphoric Acid. Citrate soluble 

 ,, Insoluble 



Total ... 



11-83% 

 5-41 



17-24% 



BoNEDUST. 



Total Phosphoric Acid ., 

 Nitrogen ... 



20-85% 



3-87% 



Mechanical Condition of Bonedust. 



Coarse 

 Fine 



Nitrate of soda ... 

 Sulphate of ammonia 

 Potash sulphate 

 Potash chloride ... 



62-53% 



37-47% 



14-81%N 

 20-66%N 

 52-77%K20 

 61-94%K20 



The Use of Gypsum. 



In addition to the manures used in the three sets, gypsum was 

 included in a limited number of fields. The system of application 

 will be explained by referring to the following plan : — 



396 feet long (6 chains). Total area Ij-^ acres. 

 Each plot is ^^ of an acre. 



It will be observed that one-half of the field received the appli- 

 cation of gypsum in addition to the manures of the particular set. 

 In the other half of the field the manures of the set only were applied. 

 The intention was to harvest each half of each plot separately and 

 compare the returns of the gypsum and non-gypsum ends. To secure 

 results of reliability assumed uniformity of conditions throughout. 

 It was found, however, that the excessively wet season experienced 

 in the parts in which these special fields had been established, had, 

 in nearly all instances, resulted in one end of the field being affected 

 to a greater extent than the other, and the tests had to be abandoned. 



