1901.] PUBLIC DOCUMENT — Xo. 33. 10 



It should he noted that the inuriatc of potash stands much 

 below the sulfate for all the })eriods, its inferiority being par- 

 ticularly marked in the case of the early crops. Tliis 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 l)e 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 considera])le 

 lime, — an effect which had been noted and re})orted in a 

 number of previous years. 



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

 could undoul)tcdly be brought much nearer those on the sul- 

 fate by heavily liming the field. 



V. — The Relative Value of Differext 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 whethei- 

 it is more profitable to employ cheaper natural })lios]>halcs or 

 one of the higher-priced dissolved phosphates. The plan 

 of the experiment has l)een outlined in })revious reports. 

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

 ing points : — 



The phosphates compared on the l)asis of equal money's 

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

 ground Florida rock, IMona guano and })h()sphatic slag. 

 These phosphates were liberally applied during four years 



