liU)4.] PUBLIC DOCUMENT— No. 33. 137 



The most imi)ortant points to whith it seems desimhle to 

 tall attention are the following : — 



1. The no-})hos})hate i)lots give very low yields both of 

 hard heads and total, indicating tlu' marked dependence of 

 the cal)bage upon the supply of phosphoric acid. 



2. Apatite and soft Florida phosphate are the least effective 

 among the phosi)hates em})loycd. 



3. South Carolina rock gives a surprisingly good return, 

 being exceeded in yield of hard heads by only one plot, — 

 the one receiving dissolved bone, — while in total yield it is 

 materially exceeded by but few. 



4. The phosphatic slag ranks among the best of the phos- 

 phates used. It is exceeded in yield of hard heads by the 

 dissolved bone-black, the South Carolina rock and the raw 

 bone, in the order named : while in total weight of crop it 

 is exceeded by the dissolved bone, the raw bone and the dis- 

 solved bone-black. 



o. The most valuable crop in the field is that produced by 

 the dissolved bone, although it is slightly exceeded in total 

 yield by the crop on the raw bone. 



ti. Particular attention is called to the fact that this year, 

 as in preceding years, the i^aw bone meal gives a crop nmcli 

 superior to that obtained by the use of steamed bone meal. 



The differences in the development of the cabbages on the 

 different i)lots in the field, as affected by the phosphates ap- 

 plied, became manifest at a very early date. The plants 

 were scarcely a week old before marked ditterences could be 

 seen : and the relative development throughout the season, 

 as recorded after several examinations, Avas in about the 

 order indicated by the final yields, although most observers 

 ranked the crop on the phosphatic slag while growing rela- 

 tivelv hisfher than indicated bv the final result. 



In estimating the significance of the results U})on this 

 field, it is important to keep in mind the facts as regards the 

 character of the soil. It is what would be called a strong 

 and moderately heavy loam, and has great capacity to retain 

 moisture. The relatively insoluble phosphates are known 

 to ffive l>etter results on soils of this character than on those 

 Avhich are liijhter and drier. 



