June 26. 1916 Mineral Phosphates and Plant Nutrition 



499 



the lowest treatment, Tennessee blue phosphate gave fairly satisfactory 

 yields. Florida phosphate for the three treatments gave almost as good 

 returns as the Tennessee brown rock. Attention is called to the com- 

 parative yields of the Florida rock for the lowest and highest treatments. 

 In this case a smaller quantity of the soft phosphate gave almost as large 

 returns as the greater supply. 



Table VIII.- 



-Dry matter produced by different kinds of mineral phosphate in red clover 

 and Sixty-Day oats — series 3 



Kind of phosphate added. 



None 



Do 



Tennessee brown rock . 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Canadian apatite 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Utah rock 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



South Carolina land rock 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Tennessee blue rock . . . 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Red clover. 



Pot 

 No. 



13 

 14 

 15 

 16 



17 

 18 



19 

 20 



23 

 24 



25 

 26 



27 

 28 

 29 

 30 

 31 

 32 

 33 

 34 



35 

 36 

 37 

 38 

 39 

 40 



41 

 42 



Phos- 

 phate. 



Gni. 

 O 

 O 



II 



22 

 22 

 66 



66 

 220 

 220 



22 

 22 

 66 



66 

 220 

 220 



10. II 

 10. II 



20. 22 

 20. 22 



60. 66 



60.66 



202. 20 



202. 20 



10. 16 

 10. 16 



20.32 

 20.32 



60. 96 

 60. 96 



203. 20 

 203. 20 



10. 42 

 10. 42 



2G. 84 

 20. 84 

 62. 52 

 62. 52 

 208. 40 

 208. 40 



Yield 

 of hay. 



Gm. 



O. I 



I. c 



1. o 



2. O 

 2. O 



3-9 



4. 1 



3-8 

 4.0 



Sixty-Day oats. 



Pot 

 No. 



43 

 44 



45 

 46 



47 

 48 

 49 

 50 

 51 

 52 



53 

 54 

 55 

 56 

 57 

 58 

 59 

 60 



61 

 62 



63 

 64 



65 

 66 



67 

 68 



69 

 70 



71 

 72 



73 

 74 

 75 

 76 



79 

 80 

 81 

 82 

 83 



Phos- 

 phate. 



Gm. 



o 



22 

 22 

 66 



66 

 220 

 220 



II 



II 



22 



22 



66 



66 

 220 

 220 



10. II 

 10. II 

 20. 22 

 20. 22 

 60.66 

 60.66 

 202. 20 



202. 20 



10. 16 

 10. 16 

 20.32 

 20.32 

 60. 96 

 60. 96 



203. 20 

 203. 20 



10. 42 

 10. 42 

 20. 84 

 20. 84 

 62. 52 

 62. 52 

 208. 40 

 208 40 



Grain. 



Gm. 



1.4 

 3-2 



3-0 

 5-3 

 5-2 

 3-8 



5-0 



Straw. 



Gm. 



