40 SCIENTIFIC REPORTS OF THE AGRICULTURAL RESEARCH 



the Pusa soil, thus demonstrating the fact that this sub- 

 stance is the responsible agent of retention in the latter. 



The general conclusions arising out of this investigation 

 axe (a) that the retention of P 2 5 in calcareous soils is a 

 different phenomenon to that of non-calcareous soils, (b) 

 that the range over which applications of superphosphate 

 are effective is wide in the case of non-calcareous soils but 

 very restricted in the case of calcareous soils, and (c) that 

 the principles underlying the employment of superphos- 

 phate in non-calcareous soils or soils of low CaC0 3 content 

 are not applicable to calcareous soils, and that the condi- 

 tions for effective phosphatic manuring in the latter require 

 further close study. 



VIII. The windrowing of sugarcane. 



An Assistant was deputed to work at the Tarnab Farm, 

 North-West Frontier Province, from December, 1918, to 

 March, 1919, and during this period made numerous tests 

 in order to follow the course of the changes taking place in 

 the cane. 



The scheme of experiment was as follows :— The sugar- 

 cane area was divided into three portions, the first of which 

 was sampled and analysed on 18th December, 1918, and 

 immediately windrowed. The second portion was sampled, 

 analysed and windrowed on January 10th, and the re- 

 mainder on February 3rd. It was possible, therefore, to 

 institute comparisons between canes windrowed early and 

 late, and at the same time by drawing representative 

 samples the character of the changes which occurred in the 

 windrowed cane could be determined at any time. 



A study of the analytical data obtained showed that the 

 total? solids, as measured by Brix, increase during the period 

 of storage, so that the juice becomes more and more con- 

 centrated as time goes on. At the same time the percentage 

 of both glucose and sucrose increases, so that the juice of 

 a windrowed cane contains a larger proportion of these 

 constituents than does the original cane. On the other 

 hand, the glucose ratio widens, and there is also a slight 



