Some Ohservations on Manuring «vith Bone«diiat 



Average of two parallel pots. 



115 



If we now assume the total yield with the manure of the group iv to 

 be= TOO, we obtain the following ratio : 



I 



104 



II 



114 



III 

 loi 



IV 



100 



This result coincides with that of the former experiment with barley. 



Second Experiment with Barley. 



This experiment was carried out in three parallel series, and with a 

 different soil (alluvial sand). In order to examine here the productivity of 

 the original phosphoric acid in the soil, pots without phosphatic manure 



-served for comparison. On October 29, fifteen zinc pots received each 1 2 



.kilo, air-dry soil with the following manures'^ 



i). Each manure had the following percentage amount of nutrient : 

 The sodium nitrate= 13.92 % N. 

 The wood ash = 17.24 % KvO and 3.14 % P-JO^. 



The other manuring compounds were the same as in the former experiment with barley in sand- 

 culture. 



