Xew Yoek Agricultukal Experiment Station 241 



Table 1 shows the forms and quantities of fertilizing ingre- 

 dients that were applied in 1896-7 to each box in the sets of six 

 (6) boxes each. 



Table I. — Phosphoric Acid Availability Experiments: Fertilizer In- 

 gredients Used, 1896-7. 



Form of phosphate. 



Amount used per box. 



P*0. 



N 



K 2 



Mg S 0< 

 + 7H 2 



CaSO* 

 +2H 2 



Acid phosphate 



Florida rock (floats) . 



Thomas slag 



Redonda 



No phosphoric acid . 

 No fertilizer 



Grams. 

 4 

 4 

 4 

 4 



Grams. 

 5 

 5 

 5 

 5 

 5 



Grams. 

 10 

 10 

 10 

 10 

 10 



Grams. 

 5 

 5 

 5 

 5 

 5 



Grams. 



5 

 5 

 5 

 5 



In Table II may be seen the treatment which it was planned 

 to give the boxes in 1898-9 when the " soil " was quartz sand. 



Table II. — Phosphoric Acid Availability Experiments: Fertilizer In- • 



GREDIENTS USED, 1898-9. 



Only half of the nitrogen, potash and magnesia salts were 

 mixed with quartz sand when the boxes were filled, the intention 

 being to add the other half during the growth of the plants. The 

 development of some of the crops did not justify the application 

 of the entire amounts of these soluble salts, the total quantities 

 being supplied only to the tomato plants, two-thirds the full ration 

 being used with barley, oats, cabbage and rape and one-half with 



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