48 BULLETIN 699, U. S. DEPARTMENT OF AGRICULTURE. 
TABLE XXIII.—Yields of clover and tobacco obtained in pot tests with various 
fertilizers—Continued. 
SERIES I1—TOBACCO (AFTER CLOVER). 
Stalks and 
was Application Increase Relative 
Fertilizer. per pot. ore per pot. increase. 
Grams Grams Grams Per cent 
INONC heiress ac nce s oacc vo sceee meer meresscoue 4 coos ance Weemmcccnase EO.70 |e xce cece cel cece eee 
PAMESTONCLE S532 sos 25 OS Se eet eee Se 7.5 5.00 1.25 33.3 
DISSOMVeGSUONCe- 2S ..csk.c oes cose ete cce sec aetee r.9 4.60 -85 ONG | 
PreckspnespualGs: —---.. 2-552. 0s Pee - ee ee 10.0 7.40 3.65 97.3 
IMEATIVIRG Op teers oe Soa noc.n 8c Cea ee eeiee een eee hee 9.50 5.75 153.3 
1D) Os Bis 2 ER oe ke hwo cee tees fee eee F FS 
ROG NOSNIAIO. s cod cGS See senookcce sodas ascsne esse 10.0 \ — 2-2 a 
1 Average of two pots. 
TARLE XXIV.—Yields of wheat and clover obtained in pot tests with various 
fertilizers. 
SERIES III.—WHEAT (4-GALLON POTS). 
Whole crop. Grain. 
Applica- 
Fertilizer. tion per 
pot. Yield | Increase} Yield | Increase | Relative 
per pot. | per pot. | per pot. | per pot. | increase. 
Tn 
INGHG 2s shes tee Bete ee SERS pee Bel ese ae U3 4. Oo eS ec ee ee ee 
Dissolved hone: 252 4 = one Se 3.8 44.6 9.7 14.6 2 22.7 
Rock phosphatercanm sss ss aso ces eee 20.0 45.6 10.7 15.7 3.8 31.9 
Man Uinee ten aoe es oe eae eee 35.0 | 44.5 9.5 16.2 4.3 36.1 
Do. - -----.-- 2222-2222 esses eee eee ee Balls lo ges 1.4 14.9 3.0 25.2 
FROCK phosphate =aer as. 5. =a sen aa 20.0 | : 3 : 7 = 
SERIES III.—CLOVER (AFTER WHEAT). 
Applica- Weight | Weight ; 
Fertilizer tion per of first | ofsecond| Total | Increase | Relative 
: cutting | cutting | per pot. | per pot. | increase. 
m : per pot. | per pot. 
— | — |) | | | EE 
Grams. | Grams. | Grams. | Grams. | Grams. | Per cent. 
IN'ONG Sa ee ER es See ee Se pee ae 113.8 | oe chsh oe ee ee eee 
Dassolvedthbone®.{ 2. sek es oe ee 3.8 45.3 24.6 70. 4 41.05 139.9 
Reck phosphate: -- 52 5.0.4. Sate e 20.0 32.2 21.0 53. 2 23.85 81.3 
ETT Ge SA es Oe ee 35.0 46.5 25.0 71.5 42.15 143.6 
Ve Masta sae Se Go reeoosece ces -SheecSsse ane 35. 0 ~ - - 
Hock PHOSPHALCree neces see eee 20.0 36.5 24.5 61.0 31.65 107.8 
1 Average of two pots. 
It will be noticed that the. pots receiving applications of phos- 
phates, whether water soluble or relatively insoluble, gave consider- 
able increases in yield over the untreated pots, except in series I, 
where tobacco was grown the first year. 
The soluble phosphate on the whole gave somewhat better yields 
than the ground rock, although the latter material was applied liber- 
ally. In the second year of series II, however, when tobacco was 
grown, the ground-rock pot gave a much greater yield than the pot 
treated with acid phosphate. Contrary to what one would expect, 
the pots treated with a mixture of rock phosphate and manure gave 
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