58 BULLETIN 699, U. S. DEPARTMENT OF AGRICULTURE. 
(floats). These materials were added in such amounts that they 
each furnished 6.58 grams of phosphoric acid, an amount sufficient 
to add only 0.01 per cent of P,Q,. In addition to the phosphate each 
fertilized box received 10 grams of sodium nitrate, 5 grams of potas- 
sium chloride, and 5 grams of magnesium sulphate. In the boxes 
where the Redonda was used 10 grams of calcium sulphate was also € 
added. 
The average production for a single period is shown in Table 
XXXI. 
TABLE XXXI.—Relative weights of dry matter obtained in box experiments 
with various phosphates. 
Crop. Weight. Phosphate treatment. Crop. | Weight. 
Walesa ees vier excel aba? tere 
2 Grams e Grams. 
167 Acid phospiate Sere oe Sa fey ; 135 
OdtS a Sees Ceo seem eee 
1209S) c cogceacodecdesocadcaa= Ofel Caan eee tee Beas [romain J pits bememessosse Ee 
Sf [NO DHOSph abe. nose 36 
a Reid phosphate. .-.-...---.- 260 
IRTOats a ee eee cee ests 
Horse beams. ..-..----------- 118 Bcaoaan SPUR Rat We aE POtatoeS = eee scnereieaeceeee a 
86 | No phosphate: 222: --------- 151 
ae eld phosphate s-a-seesesec 214 
6O8|" Hloatseeee seen e ose = 141 
Clover .....---------------- PGI ERedondases ee Jos Seacoce ceeceee recess: 140 
83 | No phosphate.---=--.-----.- 135 
107 ae phosphates sess s eee 237 
STARR IOatS ee eet eee : 
‘ier eal aaa af | Bloat een pons erie. 34 
90 | No phosphate-.....-.---.-.- 163 
222 | Acid -phosphate............ 107 
: 202-|SBIOatS Se oo ee acne eecees 54 
Turnips. ....-.--+---------- 1S7 eRedondak 00. ee ad pPuczmae shscesccesteeses 51 
119 | No phosphate..---......... 37 
152 | Acid phosphate....-..-..-- 101 
loats. Se Soares ole ese 14 
Rutabagas ......----------- ee ae arc Shae saab Ad Sunflowefs...-......------- 15 
64 | No phosphate............-- 11 
| 176 | Acid phosphate.......-.... 1) 
Cauliflower....-..+--++0+-- ith | eno anh ce eee Coates ee 90 
62 \eNo phosphates a eee sneee 44 
232 | Acid phosphate............ e 
Koblrabi.....-.2s-+eeee-e-- 172 | Redonda nec ccLLLIL | pRutebagas (roots).....--+-- a: 
130 | No phosphate...........-- \ 16 
338 | Acid phosphate...........- Bo 
Batley --.ee-sseeeeeseseeee- 186 Peni gs oaaone ceesessesseeerecd 
146| No phosphate’. 22-22 02a ne eee 
218 | Acid phosphate............ s 
OG) [IN OPUS S36 opetcononceeoecdse : 
CORN ee elesieaiinicisieereiaater 98 RedonGack. chien coe ee ee Kohirabissescscseeseeescees 92 
31 | No phosphate: ---..-.....-- 60 
185 | Acid phosphate............ oa 
Potatoes (tubers).......... 0 | Redonda ec LLL pO ats -seeeeeeeeeeteeeeeeeee: 380 
115 | No phosphate.............- 319 
173 | Acid phosphate.......-.... ae 
1G eGR SS665 cacanecodee seesor : 
Carrots (roots) ......-...-.- 1194, Redondat evn isso ea MIMO GR jas cmcciecieeeselee ii - 346 
102 | No phosphate............-- 353 
196 | Acid phosphate............ 
: P15) | loats ase see re cnisac ce tee 
Parsnips (roots) SaOoCSoceecec VAS Redond ahs. Sacco ess ess 
120 | No phosphate.............- 
While all the phosphate treatments appeared to be beneficial, in — 
every case the boxes receiving acid phosphate gave greater yields 
than those treated with the Redonda or raw Florida rock. The gain 
was especially marked in the case of the Graminee family, three 
