98 



Journal of Agricultural Research 



Vol. XVII, No. 3 



Table VIII. 



-Weight of rape and its percentage of sulphur and nitrogen on the different 

 soils and sand cultures— Continued. 



Treatment. 



Sand." 



Extract A. 



Weight. 



Calcium sulphate . , 



Sodium nitrate 



Sodium sulphate . . 



Sodium nitrate 



Sulphur 



Sodium nitrate 



Calcium carbonate. 



Sodium nitrate 



Sodium nitrate 



Calcium carbonate. 

 No fertilizer 



Gm. 



h 



1.03 



50 

 59 



Per- I Per- 

 centage j centage 

 of sul- lOf nitro- 

 phur. I gen 



I 



Weight. 



1-13 



•93 

 I. 29 



.07 



3-53 

 2-35 

 8.29 

 4-31 



Extract B. 



Gm. 



0-73 



.62 



•35 

 •25 



Per- 

 centage 

 of sul- 

 phur. 



Per- 

 centage 

 of nitro- 

 gen. 



0. 90 



1. 40 



I- 51 



3-75 

 3-38 



5-58 

 4. 00 



a A=beaverdani soil and sand; B=Medford loam; C= antelope-clay-adobe. 



Petersen (19) in an analysis showing different forms of sulphur in plants 

 found more organic sulphur in clover, rape, and radish where sulphur was 

 present in the fertilizers used, and Ames and Boltz (j) report increase of 

 organic sulphur in rape where sulphates were applied to the soil. These 

 results and the increase in nitrogen content support the idea that main- 

 taining a sufficient supply of sulphate sulphur and available nitrogen in the 

 soil vvould tend toward more protein or other sulphur organic-compounds 

 being formed in the plant. The sulphur content is generally increased 

 wherever sulphur fertilizer is added. The sulphate radical is in combi- , 

 nation with some other radical and the question arises whether the mineral 

 content or ash of the plant is not increased by this noticeable increase 

 of sulphate sulphur. If sulphur is applied as sodium sulphate will the 

 sodium content of the plant be increased or if calcium sulphate is used 

 will the calcium be absorbed by the plant ? 



Table IX. — Percentage of total sulphur, sulphate sulphur, organic sulphur, and total 

 nitrogen in alfalfa grown on sulphured and unsulphured portions of three different 

 Oregon soils 



Soil. 



I. . . 

 2. . . 

 3--- 



Treatment. 



Total 

 sulphur. 



Sulphur. . . 

 No sulphur. 

 Sulphur . . . 

 No sulphur. 

 Sulphur. . . 

 No sulphur 



o. 227 

 . 127 

 . 167 

 .118 

 . 200 

 .118 



Sulphate 

 sulphur. 



o. 0603 

 None. 



• 0356 

 None. 



None. 



Organic 

 sulphur. 



167 



127 



131 

 118 

 141 

 118 



Total 

 nitrogen. 



2.51 

 2. 22 

 2. 16 

 2. 01 

 2.38 

 2.09 



