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 P2O5. 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 oMained in box experiments 



with various phosphates. 



Crop. 



Weight. 



Phosphate treatment. 



Crop. 



Weight. 



Peas 



Horse heans 



Clover 



Alfalfa 



Turnips 



Rutabagas 



Cauliflower 



Kohlrabi 



Barley 



Com 



Potatoes (tubers) 

 Carrots (roots) . . . 

 Parsnips (roots).. 



Grams. 



167 



122 



94 



87 



269 



128 



118 



86 



217 



169 



126 



83 



107 



97 



87 



90 



222 



202 



187 



119 



152 



145 



122 



64 



176 



167 



107 



62 



232 



209 



172 



130 



338 



171 



186 



146 



218 



85 



98 



31 



185 



131 



140 



115 



173 



109 



113 



102 



196 



115 



114 



120 



Acid phosphate 



Floats 



Redonda ... 



No phosphite.. 

 Acid phosphate 



Floats 



Redonda 



No phosphate. . 

 Acid phosphate 



Floats 



Redonda 



No phosphate.. 

 Acid phosphate 



Floats 



Redonda 



No phosphate.. 

 Acid phosphate 



Floats 



Redonda 



No phosphate.. 

 Acid phosphate 



Floats 



Redonda 



No phosphate- . 

 Acid phosphate 



Floats 



Redonda 



No phosphate.. 

 Acid phosphate 



Floats 



Redonda 



No phosphate.. 

 Acid phosphate 



Floats 



Redonda 



No phosphate.. 

 Acid phosphate 



Floats 



Redonda 



No phosphate.. 

 Acid phosphate 



Floats 



Redonda 



No phosphate. . 

 Acid phosphate 



Floats 



Redonda 



No phosphate.. 

 Acid phosphate 



Floats 



Redonda 



No phosphate.. 



[Tomatoes . 



Carrots. 



Parsnips . 



Buckwheat . 



Sunflowers. 



Turnips (roots) . . . 

 Rutabagas (roots). 



Cauliflower. 



Kohlrabi. 



Oats. 



Timothy. 



Grams. 

 135 

 92 

 79 

 36 

 260 

 187 

 156 

 151 

 214 

 141 

 140 

 135 

 237 

 151 

 155 

 163 

 107 

 54 

 51 

 37 

 101 

 14 

 15 

 11 

 100 

 70 

 90 

 44 

 62 

 47 

 32 

 16 

 50 

 19 



153 

 129 

 92 

 60 

 662 

 307 

 380 

 319 

 410 

 323 

 346 

 353 



Wliile 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 Graminesa family, three 



