F. FLETCHER. 8 
CHEMICAL COMPOSITION. 
Insoluble silicates and sand sr ces ... 68:06 
Ferric oxide ine eee eee eae wee «=—s BS 
Alumina anh a bas 306 eae, SLLOF 
Lime ... eee one dns cee Gon LD 
Magnesia eee eee oe aon eee "54 
Potash ae = om eae ous "42 
Soda ... 208 i 500 ARC 505 ‘31 
Phosphoric acid ... a aes eee eee ‘09 
Sulphuric acid ... ces oa woe eas 06 
Carbonic acid «s. eae sat ae vee 94 
Chlorine soe eee aoe eos ae ‘07 
Organic matter and combined water... ae eo §=§.: 689. 
100-00 
Total nitrogen ... wate ove eee eo. 036 
' Nitric nitrogen ... vee Sac oe ..» ‘O0014 
Available phosphoric acid ... vee ses -- O16 
Available potash vee see cae ie, O12 
The observations were taken as follows :— 
Plots of various crops were grown side by side, each plot 
being sown by means of a drill in such a way that the rows of 
crops (2 ft. apart) were parallel in all the plots. Further, several 
plots were left fallow as it was found that some crops growing 
on the border of a fallow yielded at a rate as much as 10 times 
as great as the rate in the centre of the plot (Annual Report of 
the Bombay Farms for 1904-05). Again, cotton and sorghum 
were sown in alternate rows in the same plot. 
The following observations were then made :— 
(1) The yield of the row of each crop bordering on fallow. 
(2) The yield of the row of each crop bordering on a plot 
bearing another crop. 
(3) The yield of a row of each crop in the centre of a plot 
bearing only that crop. 
(4) The yield of a row of cotton when grown with a row of 
sorghum of each side (at a distance of 2 ft.). 
(5) The yield of the row of sorghum when grown with a 
row of cotton on each side (at a distance of 2 [t.). 
