1901.] PUBLIC DOCUMENT — No. 33. 101 



After Manure teas used, — 189S-1900. 



Early Crops. Late Crops 



Sulfate of potash, 

 Mtirlate of potash, , 



100.0 

 86.1 



100.0 



It should be noted that the muriate of pottish stands inueh 

 below the sulftite for all the periods, its inferiority being par- 

 ticularly marked in the case of the early crops. This marked 

 inferiority in the latter years of the experiment for the early 

 crops is doubtless in considerable measure due to the fact 

 that the yields of such crops on the one plot where the muri- 

 ate of potash and sulfate of ammonia are used together, 

 which has always been exceedingly small, with the progress 

 of time appear to be growing relatively worse. This is 

 doubtless due in some measure to the fact that the continued 

 use of muriate of potash has caused the loss of considerable 

 lime, — an effect which had been noted and reported in a 

 number of previous years. 



The yields on the muriate, it may be said in conclusion, 

 could undoubtedly l)e brought much nearer those on the sul- 

 fate by heavily liming the tield. 



Y. — The Relative Value of Different Phosphates. 



(Field F.) 



The phosphates under comparison in this experiment 

 (which was begun in 1890) have been applied on the basis 

 of equal money's worth, the idea being to determine whether 

 it is more profitable to employ cheaper natural phosphates or 

 one of the higher-priced dissolved phosphates. The plan 

 of the experiment has been outlined in previous reports. 

 It is necessary to state here, for clearness only, the follow- 

 ing points : — 



The phosphates compared on the basis of equal money's 

 worth are dissolved bone-black, ground South Carolina rock, 

 ground Florida rock, Mona guano and phosphatic slag. 

 These phosphates were lil)erally applied during four years 



