20 COCONUT CULTIVATION 



means, be dissolved out of the soil, and it will 

 remain in the liquid, from whence it can be 

 thrown down by a solution of oxalate of 

 ammonia. But this process can only be attempted 

 by a person having some knowledge of chemistry. 

 The proportion of vegetable matter, or humus, 

 in the soil is ascertained in a rough manner, 

 by heating for an hour to a red heat a given 

 quantity of thoroughly dry earth in an iron 

 or clay vessel, when the vegetable matter will 

 be burnt oft'. The earth is then to be cooled 

 and weighed, and the loss in weight will give 

 the proportion of humus in the soil (Alford 

 Nicholls). 



Classification of Soils (after Schiibler and 

 Wrightson). 



Sub-Classes. 



I. Clay or argillaceous soils. 1. With lime. 

 (Over 50 per cent, of clay.) 2. Without lime. 



II. Loamy soils. 1. With lime. 



(30 to 50 per cent, of clay.) 2. Without lime. 



III. Sandy loams. 1. With lime. 

 (20 to 30 per cent, of clay.) 2. Without lime. 



IV. Loamy sands. 1. With lime. 

 (10 to 20 per cent, of clay.) 2. Without lime. 



V. Sandy soils. 1. With lime. 



(Over 70 per cent, of sand.) 2. Without lime. 



VI. Marly soils. 1. Clayey marl. 



(5 to 20 per cent, of lime.) 2. Loamy marl. 



3. Sandy loam marl. 



4. Loamy sand marl. 



5. Vegetable marl. 



