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MIXTURES CONTAINING AMMONIA, PHOSPHORIC ACID

AND POTASH. In Table XIV are given analyses of two hundred and ninetynine samples of complete fertilizers. Two hundred and eightytwo were drawn officially by the Station agent and seventeen were submitted by purchasers.

In the column headed "grade" appear the figures which represent the guaranteed amounts of ammonia, available phosphoric acid and potash in the order named; thus, 4-8-4 means that the brand is guaranteed to contain 4 per cent of ammonia, 8 per cent of available phosphoric acid and 4 per cent of potash. In the analyses on the right hand pages of the table the corresponding percentages of these constituents as found appear in bold face type.

CONCERNING GUARANTIES. Of the two hundred and eighty-two official samples, one hundred and twenty, or about 40 per cent, failed to completely satisfy their guaranties, deficiencies of 0.12 per cent in ammonia, 0.2 per cent in available phosphoric acid and 0.15 per cent in potash being disregarded. Each sample requires three major determinations in order to check the guaranty, hence eight hundred and fortysix determinations have been required for the official samples

Since some samples have been deficient in more than one item, the total number of deficiencies found was one hundred and forty-nine; in other words, about 82.4 per cent of the individual items of plant food guaranteed have been substantially correct or in excess of guaranties.

Taking the total number of samples of each manufacturer who registered three or more brands, and calculating from the analyses the average shortage or overrun in elements of plant food guaranteed, we deduce the following summary: Of 26 manufacturers, 16 equaled or exceeded guaranties in the three elements. 9 equaled or exceeded guaranties in two elements and were

short in one. 1 equaled or exceeded the guaranty in one element and was

short in two.

in this group.

Nine of the shortages were in ammonia and there was one each in available phosphoric acid and potash. The ammonia deficiencies ranged from 0.10 to 0.53 per cent; seven were less than 0.25 per cent. The deficiencies in available phosphoric acid and potash were 0.15 and 0.19 per cent respectively.

ANALYSES REQUIRING SPECIAL COMMENT. Special comment or explanation is due in connection with the following analyses:

185. Aben Hardware Co. This sample represents a part of a cargo of fertilizer salvaged from a wrecked vessel. The goods were found to be under guaranty but they were sold for a price at which the purchaser suffered no loss.

158. Am. Agr. Chem. Co., 3-8-4. The manufacturer obtained 3.74 per cent of potash on a duplicate portion of our sample. Our report for potash was 3.71 per cent. On 159, 5-8-7 of the same manufacturer, their result for potash was 6.71 per cent; our report was 6.50 per cent.

Five of the Armour brands have shown considerable deficiencies. Second samples were analyzed in nearly all cases.

23398. Atlantic Tobacco Manure 5-8-6. This was found below guaranty in ammonia; a second sample, 172, from another source, was also low. The results for the two samples were 4.44 and 4.77 respectively.

23125. Berkshire Complete Tobacco 5-3-5. This showed 4.83 per cent ammonia but a second sample, 5, from another source showed 5.22 per cent. The average analysis for the two samples is 5.03-3.89-5.78, which meets the guaranty.

23301. This sample was drawn as Chittenden's Top Dresser 6-8-4, but analysis showed it to be a 4-8-4 brand. Investigation was made but it could not be determined beyond doubt whether Potato Manure was packed in bags marked "Top Dresser" or whether an error in sampling had occurred. A second sample could not be obtained from this or any other purchaser and the sample is, therefore, accepted as a 4-8-4 brand.

23392. Clark's Special Mixture, 4-8-4, was reported low in ammonia and potash, but a second sample, 299, was found to meet the guaranty. The average of the two analyses is 3.78-8.69-3.99 which satisfies the guaranty, except in ammonia, and shows no significant deficiency in money value.

23038. Frisbie's Special 3-8-4, was reported low in total phosphoric acid; a second sample, 23305, was below guaranty in total phosphoric acid and in potash. Available phosphoric acid was satisfactory in both cases. The average for the two samples is 2.94-8.17-3.82.

22992. Frisbie's 4-8-4 was reported low in ammonia and potash; the second sample, 23274, was likewise deficient. The average for the two analyses is 3.76-8.51-3.73.

22990. Frisbie's 5-8-7 was low in ammonia, and the second sample, 23273, was deficient in ammonia and potash. The average of the two analyses was 4.70-8.85-6.79.

22984. Frisbie's 7-5-4 was reported low in ammonia, and the second sample, 162, was also below guaranty in this respect. The average of both analyses is 6.52-5.65-4.10.

23037. Lowell 5-8-7, and 23041, Lowell 4-8-4. These two samples were found to be below guaranty in ammonia. Portions of our samples were submitted to the manufacturer and the check results were in close agreement with our figures.

23243. Lowell Tobacco 5-4-5 was found low in ammonia but the second sample, 8, was not deficient. The average of two analyses is 4.87-5.05-5.26.

23154. Naco Brand 2-8-2. This brand is called 2-8-2 but its actual guaranty is 2.8-11.3-2.8, the idea being that the purchaser is to understand that a pound of this brand will contain the same amount of plant food as one and 2/5 pounds of a 2-8-2 grade. Several other brands of the Nitrate Agencies goods are listed on this "equivalent" plan. Registrations, however, should declare the percentage amounts of elements in the goods as sold. To have the brand indicate one grade and the analysis another leads only to confusion.

23060. Royster's Top Dresser 7-6-5 was found to be low in ammonia. Analysis of a duplicate portion of our sample by the manufacturer confirmed our result.

23189. Virginia-Carolina 4-8-6; 23193, 3-9-5; and 92, 8-6-6. Duplicate portions of our samples were sent to the manufacturer and their results were in substantial accord with ours in all cases.

The Rogers and Hubbard Co. advise us that very discordant results for available phosphoric acid have been reported to them by control and by commercial laboratories on their bone-base goods. In this connection it should be noted that so-called "available” phosphoric acid is largely influenced by the method of determining citrate-insoluble phosphoric acid, which method was devised for use upon acid phosphate and which does not accurately evaluate phosphoric acid from other sources such as bone, tankage, etc.

DEFICIENCIES IN MONEY VALUE.

In eighteen brands deficiencies have amounted to more than a dollar per ton, the values being arrived at by balancing overruns against shortages and reckoning ammonia at 21 cents per pound and available phosphoric acid and potash each at 4 cents per pound. Where more than one sample of a given brand has been analyzed the commercial shortage has been estimated on the basis of the average of the analyses made. The brands thus found deficient are listed in Table XV.

TABLE XV. Deficient BRANDS, 1924.

Approximate No. Brand.

deficiency in

money value per ton 159 A. A. C. Co.'s Patapsco 5-8-7..

$1.06 23350 | Armour's Big Crop 3-8-4...

1.631 662 23315 | Armour's Big Crop 4-6-10....

1.401 661 23358 | Armour's Big Crop 5-8-5...

1.241 173 23312 | Armour's Big Crop 5-8-7...

1.909 664 23318 | Armour's Big Crop 8-6-6...

7.841 665 23398 Atlantic Tobacco Manure 5-8-6......

1.17 172 23335' Bowker's Market Garden Fertilizer..

1.39 23357 Bowker's Stockbridge Potato and Vegetable Manure. 1.14 22900 302 Eastern States 7-8-3 No-Filler...

4.50* 307 22984 Frisbie's Top Dresser 7-5-4.. ...

1.41 162 23071' Godfrey's Potato Manure 4-8-5.....

2.44 1371. A. C. Double Strength Fertilizer 10-8-10..

2.60% 669 23435' Nitrate Agencies Naco Brand 5-8-7..

2.11 23429 Nitrate Agencies Naco Equivalent 5-8-7.

1.63 23060 Royster's Top Dresser...

3.13 23468 Royster's Wrapper Brand..

2.21 92 Virginia-Carolina Tip Top Brand. *} -.

2.201 The products of a given manufacturer are more adequately judged on the record over a period of years than on the results of a single inspection. If the data given in Table XV is combined with similar data for the preceding three years and compared with the total number of samples of each manufacturer's goods analyzed in this four-year period, we find that of approximately one thousand samples, about one hundred have shown deficiencies in money value of more than $1.00 per ton. In other words, purchasers have obtained commercial values substantially equal to guaranties, or in excess of the same, in about 90 per cent of the purchases represented. This is shown in more detail in the accompanying tabulation, Table XVI. A manufacturer's name does not appear unless ten or more official samples have been analyzed in the four-year period, and the figures refer to individual samples and not to averages.

1 Based on average of two analyses.
: Based on average of three analyses.

28

TABLE XVI. COMMERCIAL Deficiencies 1921-1924 INCLUSIVE.

Number of samples Manufacturer.

Total number substantially equaling of samples. or exceeding guaranty

in money value. American Agricultural Chemical Co...., 188

177 Apothecaries Hall Co....

28 Armour Fertilizer Works..

47

32 Atlantic Packing Co...

30

26 Berkshire Fertilizer Co..

32

32 Bowker Fertilizer Co..

57

50 The E. D. Chittenden Co...

26

25 E. B. Clark Seed Co.,

18

16 The Coe-Mortimer Co.

30

27 Eastern States Farmers' Exchange.

39

32 Essex Fertilizer Co....

31

30. L. T. Frisbie Co...

48

38 International Agricultural Corp...

33

29 Lowell Fertilizer Co...

42

35 Mapes Fertilizer and Peruvian Guano Co.. 53

52 New England Fertilizer Co...

33

30 Nitrate Agencies Co..

14 Olds & Whipple, Inc.

23 Parmenter & Polsey Fertilizer Co.

16

15 The Rogers & Hubbard Co...

53

51 F. S. Royster Guano Co.

30

21 Sanderson Fertilizer & Chemical Co..

34

32 M. L. Shoemaker & Co...

11

11 Springfield Rendering Co.,

18

16 Virginia-Carolina Chemical Co.

38

35 Wilcox Fertilizer Co....

31

28

11

23

Total...

1003

902

CLASSIFICATION OF GRADES WITH REFERENCE

TO AMMONIA.

About 70 per cent of the two hundred and eighty-two samples examined have carried guaranties of ammonia of 4 per cent or over. A tabulation for the last four years shows the distribution of ammonia grades and indicates a decrease in the proportion of low nitrogen goods. Guaranty.

Percentage of Samples. 1 per cent ammonia (0.82 nitrogen).. 10.0 6.0 4.2 2.1 2 per cent ammonia (1.65 nitrogen). 20.4 19.1 16.5 12.8 3 per cent ammonia (2.47 nitrogen)

23.2 19.1 16.1 14.9 4 per cent ammonia (3.29 nitrogen)

20.4 25.9 26.1 24.8 5 per cent ammonia (4.11 nitrogen)

21.4 23.0 24.5 27.0 6 per cent ammonia (4.94 nitrogen)

4.6 6.9 4.9 6.7 7 per cent and over (5.76 or more)

7.7 11.7 Total....

100.0 100.0 100.0 100.0

1921

1922

1923

1924

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