34 



Summary. 



Thirtv-six reports were received by this station from forty-two 

 experiments begun in 1891, and twenty-five out of thirty-six re- 

 ported results in 1892, from which the following is gathered by 

 comparing results for two years: 



Seven of these soils are deficient in the three main elements of 

 plant food, and are benefited by the use of a complete fertili- 

 zer, as in plot No. 9, while eight of them are not deficient in pot- 

 ash as is shown by the increased yield of plot No. 6, nitrogen 

 and phosphoric acid, over plot No. 9, complete fertilizer. In the 

 balance of the experiments results are too confiicting for any 

 conclusions to be drawn. 



FLOATS WITH NITROGEN. 



It will be found by comparing results of floats and nitrate of 

 soda with floats and green cotton seed for two years, that only in 

 one experiment has nitrate of soda with floats given best results^ 

 while fourteen give best results to floats with green cotton seed 

 and the balance of the results are conflicting. 



It will be seen from the foregoing that floats with green cotton 

 seed give best result sand the thought is suggested that as nitrate 

 of soda is more easily leached from the soil and more readily 

 taken up by the plant, the supply. of nitrogen is exhausted in an 

 earlier state of the plant's growth, but the opposite conditions 

 existing in green cotton seed, the nitrogen, being less available, 

 gives the support to the plant during the entire growing season 

 and thus coming in contact with the floats for a greater length of 

 time makes them more available. 



