24 



HATCH EXPERIMENT STATION. 



[Jan. 



Including the crops of the past year, the standing is 

 shown below ; under the headings early and late crops re- 

 spectively are included those specified in section A : — 



Febtilizeb. 



Early Crops 

 (Per Cent.). 



Late Crops 



(PerCent.). 



Sulfate of potaih, 

 Muriate of potash, 



100.0 

 92.6 



100.0 

 103.0 



It will be noticed that for the early crops the sulfate of 

 potash is superior to the muriate, while for the late crops, 

 including those of this year, muriate stands slightly ahead. 

 This has not been the case in earlier years, but the nature 

 of the difference has always been the same. The sulfate 

 should undoubtedly be preferred for early crops, unless the 

 soil is heavily limed, in which case results here and in many 

 other places indicate that the muriate may answer equally 

 well. 



IV. — The Relative Value of Different Phosphates. 



(Field F.) 



The object of this experiment is to determine whether it 

 is more profitable to employ cheaper natural phosphates, 

 or one of the higher priced dissolved phosphates. The 

 articles compared are dissolved bone-black, ground South 

 Carolina rock, ground Florida rock, Mona guano and phos- 

 phatic slag. These phosphates were applied during the 

 years 1890 to 1893, on the basis of equal money's worth. 

 The amounts of phosphoric acid supplied to the several 

 plots on this basis have of course varied widely, as the 

 prices of the materials differ greatly. The actual amounts of 

 phosphoric acid supplied the several plots are as follows : — 



Plots. 



Fertilizer. 



Phosphatic slag, 



Mona guano 



Ground Florida rock phosphate, 

 Ground South Carolina rock, . 

 Dissolved bone-black, 



Pounds. 



Plot 1, 

 Plot 2, 

 Plot 3, 



Plot 4, 

 Plot 5. 



96.72 



72.04 



165.70 



144.48 



45.36 



