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DOUBLE SULPHATE OF POTASH AND MAGNESIA

OR "DOUBLE MANURE SALTS".

Six samples were analyzed this year and the results are given in Table IX.

This salt contains potash and magnesia combined as sulphate and is relatively free from chlorine, which makes it well adapted for use in tobacco fertilizers. It generally contains from 25 to 28 per cent of potash and from 8 to 12 per cent of magnesia. In the last three years, however, seven out of twenty-one samples examined by us have shown amounts of magnesia less than 8 per cent, these ranging from 6.6 down to as low as 3 per cent. In only four of the total number has chlorine exceeded 4 per cent and in none has it reached 5 per cent.

The average potash content in samples analyzed this year is 27.67 per cent and the average cost per pound of potash, at the prices quoted, is 5.1 cents.

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IV. RAW MATERIALS CONTAINING NITROGEN AND

POTASH.

One sample of nitrate of potash and three of nitrate of soda and potash have been analyzed, all sampled by the Station agent. 23020. Nitrate of potash from Calcutta, India. Stock of the Lyman Farm, Middlefield.

22924 Nitrate of Soda and Potash. Sold by Apothecaries Hall, sampled from stock of J. A. Glasnapp, West Cheshire.

23416. Nitrapo. Sold by Nitrate Agencies Co., sampled from stock of F. H. Thrall, Windsor.

191. Nitrapo. Sold by Nitrate Agencies Co., sampled from stock of E. N. Austin, Suffield. Analyses are given in Table X.

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The price quoted in case of sample 22924 was $75.00 per ton. Allowing 5 cents per pound for potash the cost of nitrogen was 19.6 cents, which is a little less than the minimum cost calculated for nitrate of soda this year.

V. RAW MATERIALS CONTAINING NITROGEN AND

PHOSPHORIC ACID.

DRY GROUND FISH.

Forty samples were analyzed and the results are given in Table XI.

The prevailing guaranty for nitrogen was 8.23 per cent, equivalent to 10 per cent of ammonia. The guaranties for phosphoric acid varied from 4 to 9 per cent.

The average nitrogen content found was 8.45 per cent, equivalent to 10.27 per cent of ammonia, and the average for phosphoric acid was 7.37 per cent.

Based upon the average cost per ton as quoted, and allowing 5 cents per pound for phosphoric acid, nitrogen in this material has cost about 37.9 cents per pound. There were considerable overruns in phosphoric acid in most cases, assuming an average where no guaranty was given. Taking these into account, there were no deficiencies in nitrogen which exceeded $1.00 per ton except in 23418 where the estimated shortage was $1.14.

TANKAGE.

Tankage is prepared from animal refuse secured from slaughter houses and meat markets and may contain considerable and varying amounts of bone. The distinction between meat tankage and bone tankage is not sharply drawn but, in general, tankage with 5 per cent or less of nitrogen and 15 per cent or more of phosphoric acid shows considerable bone and is often sold as bone and meat tankage. As the nitrogen content increases, phosphoric acid becomes less, and in tankage containing over 5 per cent of nitrogen there is generally less than 15 per cent of phosphoric acid, indicating a preponderance of meat. According to definitions established for tankage to be used for feeding purposes, phosphoric acid in excess of 10 per cent is regarded as bone and meat tankage.

Fineness is an important factor in determining the utilization of tankage by crops, particularly in those products containing the higher amounts of bone.

Eighteen samples have been analyzed and analyses are given in

Table XII.

Sample 171 was drawn to check the results obtained on 23142. Sample 23021 was sold direct to the user and was reinforced with bone phosphate at the direction of the purchaser.

On the basis of the classification suggested above there are six samples in which the nitrogen is less than 5 per cent and the phosphoric acid more than 15 per cent; in the remaining twelve the reverse is true, i. e., nitrogen is more than 5 per cent and phosphoric acid is less than 15 per cent. In the first group the average nitrogen is 4.14 per cent and the average phosphoric acid is 19.86 per cent, which approaches the composition of bone. The average of quoted prices is $34.79.

In the second group the averages for nitrogen and phosphoric acid are 6.62 and 10.35 per cent respectively, and the average price quoted is $46.99.

GROUND BONE.

Twenty-six samples were analyzed and results are given in Table XIII.

The guaranties for nitrogen and phosphoric acid were met in almost all cases, generally with a considerable overage. Two samples which were deficient in phosphoric acid, 23129 and 43, contained excesses of nitrogen which more than balanced the deficiencies.

In fifteen samples 50 per cent or more of the material was finer than 1/50th of an inch, and in five, 60 per cent or more was of that degree of fineness.

Prices quoted ranged from $36.50 to $66.00, the average being $49.72. The averages for nitrogen and phosphoric acid were 3.42 and 24.16 per cent respectively. Allowing 27 cents per pound for nitrogen, phosphoric acid from this source has cost 6.5 cents per pound.

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