296 QUEENSLAND AGRICULTURAL JOURNAL, [1 Sevr., 1899. 
oil-cakes—is not returned to the soil in the form of a fertiliser. These oil-cakes 
were formerly almost exclusively employed as fertilisers, but, as they have proved 
to be more economical when used for feeding cattle, they are now being replaced 
by the more valuable commercial fertilisers. 
Very detailed fertiliser experiments on cotton have been conducted at the 
Agricultural Experiment Station at Auburn, Alabama, U.S. The following 
table represents the results of a series of single trials, arranged according to 
the nature of the soil. The soils are intended to represent the various grades 
of the several kinds selected :— 
FeRTILISING EXPERIMENTS ON Corron IN ALABAMA, U.S.A.* 
aoe ere amen sx aro = omer 7 aa a eT —— ee 
| J ., . | Sandy Soil; | Sandy Soil; |5 3 al ry 
r Loamys Soils Subsoil : , Subsoil : BES) 4 8); ¢g a 
Subsoil: Loamy)  J.oamy Sandy. |SE4S/3 (8 | & = 
Average of— | 4 verage of—| Average of— gee” (3) a3 a Ra 
a ER ce BE 8 | oS 2 a 
: : ; : : Hes & |43 = 
see rtalsnen cs al al, on al o& : ra K 
¥ Cea Pee ictal rice rice Hge|S2m |S By & = 
NO.) Hertilisers applied per Acre| a7 eset et Seine eaten ep gon| ae le lee = 2 
ot in Ib, Bag |S a/HSa RS aS al/Hed| S22) 2 48) F = 
Plot Ske |SASISASICRSlSFals as) ame | ssc) § a 
= =) = =" = ee) Pals 3 
eal awk 324] 3 By 
rs =} e » fs 
Yields per | Yields per | Yields per se ona 8 8 te 
Acre. Acre. Acre. Wey, ie Es a 
E A 8 
f ae Sindh ae eae ety slept es |S es | 
Ib, | Ib. | Ib. | Ib. | Ib. | Ib. Toss eae Dollars.| Dollars. 
1 | 961b.Nitrate of soda ...| 375 | 596] 476| 454| 557] G21] 490 |505/ 69/ 2:13 | 3:08 
2 | 240 ,, Acid phosphate ...| 573 | 643| 684] 655 | 837} 877| 480 |678/742/ 198 | —-32 
3 64 ,, Muriate of potash,..] 435 | 493 | 452) 507 | 448 | 7 448 |497| 61) 1-44 2°36 
4 |Nofertiliser... |...  =.|_ 312 365 | 441 | 339 380] 723 384 | 421 
BO EON rae Oe oeehi |¢ 800 | B96]. 623] 595 | 490 | 8201) 676. | 578 )183] 3.87, | aap 
* Ni soda .../2 » | Alen 
Oa eeepc act 763 | 743} 973} 987} 904 |1,043| 736 |865/420) 4:11 | —96 
240 ,, Acid phosphate ... 4s 
8 | No fertiliser... <4 Ay) 
9 96lb. Nitrate of soda ... 
240 ,, Acid phosphate 
64 ,, Muriate of potash... 
10 240 », Floats | 493 | 479} 619 | 645 | 637] 896 | 416 |598|162) 1°88 1:16 
eu G nate otiiods 530 | 613 | 733} so7| 704 {1,001} 640 |728)292) 401 | 1:37 
12 |Nofertiliser.. .. «| 319 | 398] 463| 426] 536] 733) 283 |471 
13 | 848lb.Greencotton-sced | 561 | 583} 813| S06 | 821] 869) 480 |705/269/ B81 | 142 
eA Raabe Green cotton-seed | 731 | go7 | sis| 928 | 820| 909) 512 |775)/330) 569 | 163 
15 | 4240 ,, Stable manure... 776 878 | 876 | 930 |1,045 {1,040 280 |832|396| 4:24 1:07 
16 | 210» Meld ree nneal 7 |$ 744 | 760 | 990 |2.028 | 914) 936 | 896 |886) 450) 458 | 1-02 
7 | {64 » Muriateofpotash...)% 711 | gas | 792 | 763 | 7al| s0l| 576. |731/295/ 8-42 | 196 
* Agricultural Experiment Station, Auburn, Ala, U.S.A., Bulletin No. 34, January, 1892, and Bulletin No. 
42, January, 1893. 
The great difference between these results and those obtained in Mississippi 
is undoubtedly due to the small quantities of fertilisers used in the former trial. 
As regards the fertilisation with single plant-food ingredients (Plots 1, 2, 
and 3), phosphoric acid not only gave the largest yield, but the cost of producing 
the increase was lowest for this material. The much smaller increases on the 
unfertilised plots, obtained by potash or nitrogen alone, are almost the same, 
but potash is the cheaper. ‘These yields are, however, considerably smaller than 
those obtained from phosphoric acid. On the plots (4, 6, and 7), to which two 
of the plant-food ingredients were applied, the largest increase was produced by 
the combination of phosphoric acid and nitrogen, and the cost for each 100 lb. 
of this increase was lower than in the case of the other two combinations. 
The mixture of phosphoric acid and potash comes next, both as regards the 
increase, in yield and the lessened cost, while nitrogen and potash, in comparison 
with the two other combinations, produced the smallest increase at the rte 
cost. The combination of all three ingredients (Plot 9) yielded the largest 
increase, and, although the cost of the mixture per acre was highest in this 
