334 



Journal of Agricultural Research voi.xviii,no.6 



Table IV. — Percentage of sulphate sulphur in water-free composts i to 4 



May 8. . 

 Oct. 15. 



May 21. 

 Aug. 14. 



1917. 



1918. 



1919. 



May 6 



Percentage of added sulphur converted 

 to sulphate 



No. I, 

 soil and 

 manure. 



o. 007 



.056 



.087 

 093 



091 



No. 2, 

 soil, manure, 



and rock 

 phosphate. 



O. 064 

 •369 



.508 

 .561 



. 617 



.No. 3, 

 soil, manure, 

 and sulphur 



0.013 

 .580 



I- 137 

 I. 971 



2. 714 

 27. 01 



No. 4, 

 soil, manure, 

 rock phos- 

 phate, and 

 sulphur. 



0.073 

 •436 



1-353 

 3-059 



5.607 

 55-34 



Table V. — Parts per million of nitrite, nitrate, and total nitrogen in water-free 



composts I to 4 



Date. 



1917- 

 May 9 



23 



June 5 



19 



July 3 



17 



31 



Aug. 14 



28 



Sept. 20 



Oct. 9 



Nov. 6 



Dec. 12 



1918. 



Jan. 16 



May IS 



Aug. 10 



Parts per million total nitrogen in 

 water-free composts, May 11, 1917. . 



Parts per million total nitrogen in 

 water-free compost, May, 1919 



Percentage of gain in total nitrogen . . 

 Maximum parts per million nitrate 



nitrogen found • : ■ ■ 



Maximum percentage of original 



total nitrogen nitrified 



No. I, soil and 

 manure. 



Nitrite 



ni- 

 trogen. 



I. 40 

 2.58 

 .60 



2,609 



"3.145 



''2,443 



'^2,005 



20. 5 



513 



17- S 



Nitrate 



ni- 

 trogen. 



48 

 59 

 104 

 200 

 155 

 245 

 255 

 345 

 303 

 383 

 323 

 310 

 513 



393 



503 



2,609 



"3 • 145 

 ''2.443 



<^2,OOS 

 20. 5 



513 



17.8 



No. 2, soil, 

 manure, 

 and rock 



phosphate. 



Nitrite 



ni- 

 trogen. 



0.95 



2-33 

 .80 

 . 10 



.19 



•25 



-44 

 .42 

 -25 

 . 10 

 -15 

 -29 

 -36 



•35 

 • 14 



2.145 



"2,749 



62,020 



Ci,8oi 



28.2 



390 



17. o 



trogen. 



103 

 128 

 148 

 26s 

 173 

 260 

 238 

 258 

 390 



290 

 323 

 280 



2,145 



"2,749 



62,020 



<:i,8oi 



28. 2 



390 



17.0 



No. 3, soil, 



manure, 



and sulphur. 



Nitrite 



ni- 

 trogen. 



•15 

 .14 



None 



2,424 



°3-o83 

 62.033 

 '1,967 



27. 2 



440 

 17.6 



trogen. 



153 

 175 

 198 

 163 

 240 

 228 

 423 

 323 

 298 

 440 



370 



353 

 335 



2,424 



"3.083 

 62,023 

 ''1, 967 



440 

 17. 6 



No. 4, soil, 

 manure, rock 



phosphate, 

 and sulphur. 



trogen. 



2>oS9 



"2,408 



61 , 705 



Ci, 712 



i6. 9 



443 



20. 2 



Nitrate 



ni- 

 trogen. 



27 

 94 

 114 

 174 

 190 

 28s 

 258 

 293 

 273 

 410 

 330 

 310 

 443 



3S3 

 308 

 83 



02,408 

 *i,70S 

 <=I,7I2 



16.9 

 443 



a Composts had been kept in laboratory since Oct. 1 7, 1918, in Mason jars with tops on but air not excluded. 

 6 Moist composts had been kept in Mason jars with air excluded since Oct. 10, 1918. 

 c Composts had been outside exposed to weather since Oct. 17, 1918. 



