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Sandy clay soils containing o.l% phosphoric acid and a sufficient 
quantity of lime are sufficiently productive for a period of from 
8-15 years. 
If lime is not present in sufficient quantities then the percentage 
of phosphoric acid present must be at least twice as much. The 
best valle-y soil of the Mississippi contains 0.3% phosphoric acid, 
and the so-called Black-Earth has 0.46%, The red clay soils of 
Tennessee are foremost in that respect with 0.563%. As to potash, 
with 0.56 the limit is reached so that potash manuring must be 
considered a necessity. 
The soils of the -fruitful valley of the Mississippi contain 1.3%, 
other heavy clay soils contain from o.8-o.5%, light clay and sandy 
soils contain, even up to a considerable depth not less than 1% of 
this constituent and 1.4% of lime. 
The soils of the South of the United States are generally rich in 
potash and therefore seldom need manure containing enough of 
that substance. 
Not much importance is to be attached to potash if the soils are 
rich in phosphoric acid and lime. 
No manure was used in America before the War of Independence. 
After the liberation of the slaves many good workmen became 
free, who threw themselves into agriculture and specially busied 
themselves with cotton growing. From that time to the present day; 
concentrated manures are employed in the cultivation of cotton in 
the United States, with the exception of a few places where the 
virgin soil is used and in the alluvial soils along the great rivers. 
Perhaps on no other agricultural product has manure exercised 
such influence. Not only because with the assistance of manure, 
paying results were possible from soils which would otherwise have 
been unsuitable for cultivation, but the good effect of manure, 
manifests itself also in this respect, that the growth of the cotton 
plant is quickened, and thereby the limits of its area of cultivation 
is pushed further northwards. 
And that no small amount of manure is used is seen from the 
fact that in the states of South Carolina and Georgia one lot of 
manure, consisting of 60 kilos phosphoric acid, 18 kilos Nitrogen 
and 18 kilo grammes of potash is usually used per bouw. Ibis is 
generally given in this form : — 
Hypophosphate 410 k.g. 
Chili Saltpeter 1 15 ,, 
Potass Chlorate 100 ,, 
One lot costing about f. 40. 
The only place where col ton is grown without any manure, is 
on rich alluvial soils. And even in these cases some manure is used 
as in the fruitful alluvial soils of Egypt, which continually receives 
the mud of the Nile, where 17 — 26 M 3 of stable manure are used 
per bouw. 
Culture and Harvest. 
In order to get a good insight into the Cotton culture, we can do 
no better than to consider here shortly the states which exist in 
North America, the land which cultivates t lie most cotton. 
