112 



Borelli river, there is a deposit unexcelled in Assam, so far as 

 I know, for richness as a manure, and one sample sent to me 

 from Sonajuli was almost as rich. They both contained over 20 

 per cent, of Organic Matter, and '60 per cent, of Nitrogen. In 

 such positions as these deposits occur, and where they are available, 

 there need be no anxiety about the manuring of the land. In other 

 positions this is precisely a place for oilcake and superphosphate. 

 This manure put on the land at the rate of say 12 maunds mustard 

 cake and 3 maunds of superphosphate, and applied in the spring 

 with the early spring hoeing, would answer for three years, if in 

 addition two green manuring crops were grown in the meantime of 

 Mali Kalai. Without these green manuring crops, the amount of 

 nitrogen supplied would be insufficient ; with them it would be 

 enough. 



Near the east side of the bank, the soil is apparently not 

 quite so good as on the West, The following is an analysis of 

 this section : 



* Containing Nitrogen 



Such soil as this is in urgent need of manuring in one of the 

 ways above suggested. 



SANDY SOIL AT TEZPUR. 



Between the Tezpur Bank and the Himalayas lies a tract 

 of sandy land, largely, if not entirely, formed of the valley of the 

 Borelli river, on which some of the earliest tea in the district was 

 planted. The subsoil here is sand, and in a few cases gravel, 

 and provided the water level in the soil is sufficiently far from the 

 surface, and the fertility of the soil is kept up, the land does 

 excellently. Below the sand or gravel, as the case may be, there 



