1920] 



WALSTER—BARLEl 



117 



being allowed to stand in the ice box for 24 hours. At the end of 

 the 24 hour period the magnesium ammonium phosphate was 

 filtered off, washed with 2 . 5 per cent cold ammonia water, dissolved 



f 



Fig. 13. — Influence of variation in fertilization in warm house: N y R, and P indi- 

 cate that fertilizer dosage is in excess of "normal" A B solution; contrast with results 

 shown in fig. 14, where fertilizer treatment is identical but temperature lower. 





Fig. 14. — Influence of variation of fertilization in cool house: contrast with fig. 13 



in dilute nitric acid, and the phosphorus then precipitated by means 

 of the molybdate solution. Final determination of the phosphorus 

 was made by means of the Pemberton alkalimetric method. 



