AGRICULTURAL EXPERIMENT STATION. 



31 



boxes each received an application of 37.5 grammes of muriate of 

 potash, and 50 grammes of sulphate of ammonia. Thi's amount 

 was added that there should be no deficiency in potash or nitrogen 

 to interfere with the success of the experiment. To one set of three 

 boxes which had received the above application of muriate of potash 

 and sulphate of ammonia, 37.5 gr. of dissolved bone black was 

 added to each box. To another set of three boxes there was 

 added to each box 41.1 gr. of finely ground South Carolina rock. 

 To another set of three boxes was added 31.2 grs. of finely gi'ound 

 Aruba phosphate. To another set, 42 grams of finely ground 

 Caribbean Sea guano. To another set 30.7 gr. of powdered 

 Canadian apatite. To another set 33.5 gr. of finely ground 

 Vivorella phosphate, and a set of two was left without the addition 

 of any phosphatic material. 



The dissolved bone black was applied at the rate of about 400 

 lbs. to the acre and carried 16 per cent of soluble phosphoric acid. 

 The application of crude phosphatic material was arranged so that 

 the total phosphoric acid in the crude phosphate should be double 

 the amount of soluble phosphoric acid in the dissolved bone black. 

 The fertilizing material was evenly mixed with four inches of the 

 surface soil, and then, in each box, 260 oat kernels were planted. 

 The boxes were watered with rain water whenever they needed it. 

 Below is given a table showing the analyses of the phosphatic 

 materials used in the experiment, and another table showing the 

 results of the experiment. 



Name of Phosphate. 



Di.v-olved bone black , 



Suuth Canilina rock, fine ground.. 



Aruba fine ground 



Caribbean Sea guano, fine ground 



Apatite, fine ground 



Vivorella, fine ground 



o 

 .a 



00 



o 

 .£3 



53 73 



o w 



28.64 per oent 

 35.51 «' 

 28.58 " 

 39.12 " 

 35.88 " 



o 

 •a . 



o '3 



CO o 

 "Z '" 



16.00 per cent. 

 4,47 «• 

 2.65 «' 

 7.60 " 

 0.71 " 

 9.54 «' 



