lOO 



BOTANICAL GAZETTE 



[FEBRUARY 



grow alfalfa 40 years or longer, provided, of course, none of these 

 elements is added in any way and none removed except in the crops. 

 Sample 9 A, which has the highest sulphur content, has sulphur 



TABLE III 

 Pounds per acre of sulphur and phosphorus and NtnuBER of years' supply 



FOR various crops IF MAXIMUM CROPS ARE REMOVED 



Son, NO. 



SULPHtTR 





No. of years' supply for 



Corn 



Wheat 



Timo- 

 thy 



Clover 



Alfalfa 



Phosphorus 



2 la S 



No. of years' supply for 



Corn 



Wheat 



Timo- 

 thy 



Clover 



Alfalfa 



lA 

 2A 

 3A 

 4A 

 SA 

 6A 

 7A 

 8A 

 9A 



10 A 



iiA 



12. . 



13- • 



14.. 



I5-- 



16.. 



17.. 



18.. 



19.. 



20. . 



21. . 



22. . 



23- • 

 24.. 



2S-- 

 26.. 

 27.. 

 28.. 

 29.. 

 30.. 



31. • 

 32.. 

 33- • 

 34.• 



316 

 972 

 366 

 722 

 638 

 464 

 668 

 562 

 1810 

 702 

 490 

 344 

 330 

 236 

 310 

 466 

 366 

 310 

 S16 

 464 

 262 

 244 

 412 

 528 

 318 

 472 

 306 

 490 

 470 

 322 

 506 

 500 

 326 

 626 



40 



125 



47 

 93 

 82 

 60 

 86 

 72 

 232 

 90 

 63 

 44 

 42 



30 

 40 

 60 



47 

 40 

 66 

 60 

 34 

 31 

 SZ 

 68 



41 

 61 



39 

 63 

 60 



41 



6S 

 64 

 42 

 80 



62 

 191 



72 

 142 

 125 



91 

 131 

 no 



138 

 96 

 67 

 6S 

 46 

 61 

 91 

 72 

 61 



lOI 



91 

 51 



104 

 64 

 93 

 SO 

 96 

 92 

 63 

 99 

 98 

 64 



122 



28 

 85 

 30 

 63 

 S6 

 41 

 60 

 SO 



159 

 62 



43 

 30 

 29 

 21 

 28 

 41 

 32 

 28 



45 

 41 

 23 

 22 



36 

 46 

 28 

 41 

 27 

 43 

 41 

 28 



44 

 44 

 29 



55 



24 



75 

 28 

 56 

 49 

 36 

 SI 

 43 

 139 

 54 

 38 

 26 



25 



18 

 24 

 36 

 28 



24 

 40 

 36 

 20 

 19 

 32 

 41 

 24 

 36 

 24 

 38 

 36 



25 



39 

 38 

 25 

 48 



7 

 21 



8 

 16 



14 

 10 



14 

 12 



39 

 15 

 II 



7 

 7 

 5 

 7 

 10 



10 

 6 

 5 

 9 



II 



7 

 10 



7 



720 



1036 



780 



1028 

 1576 

 1542 

 1 164 

 1878 

 1488 

 1590 

 2108 

 1256 



980 

 1132 

 1128 



984 

 1156 

 3794 

 1598 

 3272 

 2596 

 1536 

 2754 

 1954 

 353° 

 2740 

 4710 

 3000 

 3558 

 2014 



3454 

 2612 

 6814 



42 

 61 

 46 



60 

 86 

 63 



80 



"5 



83 



36 

 52 

 39 



60 

 93 

 91 

 68 

 no 

 88 



94 

 124 



74 

 58 

 67 

 66 

 58 

 68 

 223 



94 

 192 



153 



90 



162 



115 

 208 

 161 

 277 

 176 

 209 

 118 

 203 



154 

 401 



86 



131 

 129 



97 

 156 

 124 



^3Z 

 176 



105 



82 



94 



94 



82 



96 



316 



133 



273 



216 



128 



230 



163 



294 



228 



393 

 250 

 296 

 168 

 288 

 218 

 568 



114 



175 

 171 

 129 

 209 



165 

 177 



234 

 139 

 109 

 126 



125 

 109 

 128 

 422 

 177 



364 

 288 

 171 

 306 

 216 

 392 

 304 

 523 

 333 

 395 

 224 



384 

 290 



757 



SI 



79 

 77 

 58 

 94 

 74 

 80 



105 



63 



49 



57 



56 



49 



58 



190 



80 



164 



130 



77 



138 



98 



177 



137 



236 



ISO 



178 



lOI 



173 

 131 

 341 



20 

 29 

 22 



29 

 44 

 43 

 32 

 52 

 41 

 44 

 S9 

 35 

 27 



31 

 31 

 27 

 32 



105 

 44 

 91 

 72 

 43 

 77 

 54 

 98 

 76 



131 

 83 

 99 

 56 

 96 

 73 



enough for 39 years of alfalfa and phosphorus enough for 52 years 

 of alfalfa. Only one other soil, no. 2 A, had enough sulphur for 20 

 years of alfalfa, while three soils, nos. 19, 28, and 34, have enough 



