498 



Journal of Agricultural Research 



Vol. VI. No. 13 



Table VII. — Dry viatter produced by different kinds of mineral phosphates — series 2 



Kind of phosphate added. 



None 



Do 



Tennessee bro^vn rock . . 



Do 



Do 



Do 



Do 



Do 



Canadian apatite 



Do 



Do 



Do 



Do 



Do 



South Carolina land rock 



Do 



Do 



Do 



Do 



Do 



Utah rock 



Do 



Do 



Do 



Do 



Do 



Tennessee blue rock 



Do 



Do 



Do 



Do 



Do 



Florida soft rock 



Do 



Do 



Do 



Do 



Do 



Red clover. 



19 

 20 



22 



2Z 

 24 



25 

 26 



27 

 28 

 29 

 30 

 31 

 32 



33 

 34 

 35 

 36 

 37 

 38 



Quantity 

 of phos- 

 phate. 



Gtn. 

 O 



I. 81 

 I. 81 

 3.62 

 3. 62 

 10.86 

 10.86 



I. 81 

 I. 81 

 3.62 

 3. 62 

 10.86 

 10.86 



1.68 



3-3^ 



3-3^ 



10. 07 



10. 07 



I. 67 

 1.67 

 3-34 

 3-34 

 10. 01 

 10. 01 



I. 72 

 I. 72 

 3-44 

 3-44 

 10.33 

 ^0.33 



1.65 

 1.65 

 3-3° 

 3-3° 

 9.90 

 9.90 



First 

 cutting. 



Gm. 



2.7 

 I. o 

 4-3 

 4-3 

 7- I 

 6.1 



3-3 



■9 



I. 2 



1. I 

 o 



1.8 

 3-4 

 3-3 

 o 



2. 2 

 2.9 



•9 



•3 

 7.0 

 5-6 



5-0 

 3-5 

 6. I 

 4.4 



5-8 

 5-8 



Second 

 cutting. 



Gm. 

 O 



1.9 



•5 

 3-3 

 3-8 

 4.8 

 4.9 



1-3 



1.8 

 o 



4.9 



5-0 

 3-0 

 o 



3-7 

 4-7 



I- 5 

 1.8 



6.7 

 7.6 



5- I 

 5- I 

 5-0 

 5-9 



Sixty-Day oats. 



39 

 40 



41 

 42 



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 



Phos- 

 phate 

 added. 



Gm. 

 O 

 O 



3.62 



3. 62 



10.86 



10.86 



I. 81 



3.62 



3. 62 



10.86 



10.86 



1.68 

 1.68 



3-3(> 



3-36 



10. 07 



10. 07 



1. 67 

 1.67 

 3-38 

 3-38 

 10. 01 

 10. 01 



I. 72 

 1.72 

 3-44 

 3-44 

 IO-33 

 IO-33 



1.65 

 1.65 

 3-3° 

 3-30 

 9.90 

 9.90 



Yield of 

 straw. 



Gm. 



I. I 



I. O 



4.4 

 3-3 

 5-7 

 4. 2 

 6.9 

 6.7 



I. I 

 I. I 



1. I 

 1-3 



2-3 



1.4 



2. 2 

 2. o 



1-3 

 2. 2 



3-4 

 2. o 



2. o 

 1.4 

 I. 2 

 1.9 

 I. 2 

 1-5 



1.6 

 1.4 

 30 

 3-3 

 3-3 

 3-4 



1-5 

 I. 2 

 1.9 

 1.9 



3-0 

 3-2 



In the foregoing series the greatest contrast is shown by the clover in its 

 response to Tennessee brown rock phosphate and Canadian apatite. With 

 brown rock the yield advanced rapidly with each increase in the amount 

 of phosphate applied; but apatite, even with repeated plantings, failed to 

 produce growth. South Carolina land rock phosphate proved better than 

 apatite, but the growth for this treatment was very irregular. Utah 

 phosphate excelled the South Carolina land rock phosphate. Except for 



