guanos

With the exception of Peruvian, the supply of _good_ guanos of uniform composition is by no means large, and phosphatic guanos of good quality are now especially rare.

Elements of Agricultural Chemistry Thomas Anderson

In other instances, adulterated and inferior guanos are sold by the analysis of a genuine sample, and sometimes an analysis is made to do duty for many successive cargos of a guano which, though all obtained from one deposit, may differ excessively in composition.

Elements of Agricultural Chemistry Thomas Anderson

On examining the tables given above, it is obvious that guanos may be divided into two classes, the one characterized by the abundance of ammonia, the other by that of phosphates; and which, for convenience sake, may be called ammoniacal and phosphatic guanos.

Elements of Agricultural Chemistry Thomas Anderson

There is no doubt, however, that such guanos are very useful, and if obtained in large quantity, and of uniform composition, would be used to a much larger extent than they at present are.

Elements of Agricultural Chemistry Thomas Anderson

For the turnip, the ammoniacal guanos were formerly preferred, and on strong soils, under good cultivation, their effects are excellent, but on light soils they are less applicable, their soluble salts being more rapidly washed out, and their effects lost, and in these cases they are surpassed by the phosphatic guanos.

Elements of Agricultural Chemistry Thomas Anderson

Where the difference in value between different samples is required, a complete analysis is necessary, and this is indispensable in the case of the inferior guanos.

Elements of Agricultural Chemistry Thomas Anderson

The quantity of guanos of all kinds imported into this country and retained for home consumption now exceeds 240,000 tons a year.

Elements of Agricultural Chemistry Thomas Anderson

The extent to which the adulteration is carried may be judged of from the following analyses taken at random from those of a large number of guanos, all of which were sold as first-class Peruvian.

Elements of Agricultural Chemistry Thomas Anderson

In the table above, the _average_ composition of the different guanos is given; but in order to shew how much individual cargos may differ from the mean, we give here analyses of samples of the highest and lowest quality of the genuine guanos of most importance:

Elements of Agricultural Chemistry Thomas Anderson

The Saldanha Bay, and other similar deposits, have been exhausted, and few guanos of equally good quality have been lately discovered.

Elements of Agricultural Chemistry Thomas Anderson