io86 



MANURES AND MANURING 



Fixation of Phosphoric Acid soluble in water, in percentages of the quantity 

 added to the soil (i. 3312 g. of P2 O5). 



Fixation of water soluble phosporic acid 



In the layer from 

 o to 17.7 cni. deep. 



In the layer from 

 ^7-7 to 35.5 cm. deep. 



P<=: a 1 S ii I' "> 



< « i2- 





as 



15 rt 



•3g 



.tJ'd 

 MS 



A. I si Series of Experiments^ 



I. Total fixation (supplying potassium 

 nitrate) 



II. Tota! fixation (witliout potassium 

 nitrate) 



B. 2nd Series of Experi-ments. 



I. Total fixation (in chloroformed 

 soil) 



II. Physico-chemical fixation (in chlo- 

 roformed soil) 



III. Biological fixation due to micro- 

 organisms, or assimilation 



89.87' — 



1 



86.92' — 



86.92 84.11 

 86.05 183.29 



0.871 0.82 



83-87 

 83-65 



be deduced that the quantity of these bacteria increases with the improve- 

 ment of the cultural condition of the soil. 



As, regards the relations between the quality of the bacterial flora of the 

 soil and the intensity of assimilation of phosphorus, it is stated that there is 

 no possibility of ascertaining them by means of the data obtained. There 

 are however some indications pointing to the existence of sucli relations. 



MANURES 8^f - Rapid and simple Determination of the Nitrogen in Liquid Manure by means of 



AND a Densimeter. — -Vogel, in Illustrierle landu'irtschaftliche Zeilun-^, 3f3th year, No. 39, 



MAXURiNG pp. 277-278, I fig. Berlin, May 13, 1916. 



Many endeavours have been made to devise a good method by which 

 farmers might themselves rapidly and accurately ascertain the value of 

 liquid manure, but hitherto without much success. Thus, von Ahr observ- 

 ed certain relations between the specific gravity on the one hand and the 

 proportions of dry substance and nitrogen on the other by means of which 

 a fairly accurate and practical method might be contrived ; Von FeiijtzEn 

 has also published some notes which suggested a certain relation between 

 the specific gravity and the content of nitrogen. 



The recent experiments of the writer have shown that there is only 

 a reliable relation between the specilic gravity and nitrogen where the 

 liquid manure is fermented to a suificit-nt degree. The more the composi- 

 tion resembles that of fresh urine, the le.ss evident the relati<m becomes. In 

 order to be able to establish tlie relation clearly, 80 ])er cent of the total 



