Fertilisers

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Journal of the Department of Agriculture, Journal of the Department of Agriculture, Western Australia, Series 3 Western Australia, Series 3

Volume 2

Number 1 January-February, 1953 Article 26

1-1953

Fertilisers Fertilisers

H G. Cariss

Department of Agriculture

Follow this and additional works at: https://library.dpird.wa.gov.au/journal_agriculture3 Part of the Agricultural Science Commons

Recommended Citation Recommended Citation

Cariss, H G. (1953) "Fertilisers," Journal of the Department of Agriculture, Western Australia, Series 3: Vol. 2:

No. 1, Article 26.

Available at: https://library.dpird.wa.gov.au/journal_agriculture3/vol2/iss1/26

This article is brought to you for free and open access by the Agriculture at Digital Library. It has been accepted for inclusion in Journal of the Department of Agriculture, Western Australia, Series 3 by an authorized administrator of Digital Library. For more information, please contact [email protected].

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By H. G. CARISS, B.Sc. (Agric), Assistant Inspector of Fertilisers

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HE Fertilisers Act, 1928, requires t h a t all fertilisers sold in this State be registered annually with t h e Department of Agriculture. A list of fertilisers registered for t h e year commencing 1st November, 1952, showing t h e registered brand a n d name a n d registered analysis, together with t h e person or firm by whom t h e fertiliser is registered a n d t h e price of t h e fertiliser a t t h e time of registration appears in this issue.

The Fertilisers Act, 1928, also requires t h a t all fertilisers sold must be contained in a package on which is con- spicuously marked a copy of t h e registered brand and n a m e of t h e fertiliser.

In addition, if t h e quantity of a fertiliser sold is one hundredweight or more, it is necessary for t h e seller t o issue a n invoice certificate to t h e pur- chaser with each sale and include on the invoice t h e minimum percentages of fertilising ingredients a n d , when applicable, other particulars such a s fineness.

All users of fertilisers are therefore advised to consult t h e list of registered fertilisers, see t h a t bags are correctly branded a n d when applicable, insist on receiving a n invoice setting out t h e r e - quired information before delivery of fertilisers is accepted.

In t h e event of a fertiliser n o t being included in t h e list of registered fertilisers, or if a n y other doubts arise, inquiries should be made a t t h e De- p a r t m e n t of Agriculture, prior to t h e purchasing of any such fertilisers.

Inspectors are appointed under t h e Fertilisers Act, a n d periodical inspec- tions of places where fertilisers a r e kept for sale or sold are made and samples taken and submitted to t h e Govern- ment Analyst for analysis. This induces manufacturers to m a i n t a i n their fertilisers close to a n d usually a little above t h e guaranteed figures as a n in-

dication of care in manufacturing and dependability of their product.

As a guide to purchasers, unit values for t h e different forms of t h e main fertilising ingredients, nitrogen, phosphoric acid and potash, have been calculated from t h e quoted prices a n d are:—

s. d.

Nitrogen (N) as—-

Blood and Bone, Bonedust a n d

other animal fertilisers .... 75 0 Nitrate 53 9 Ammonia 36 11 Phosphoric Acid (P,O^s) as—

Water soluble in superphos-

phate 15 3 Citrate soluble in superphos-

phate 15 3 Blood and Bone, Bonedust a n d

other animal fertilisers .... 18 9 Acid soluble in superphos-

p h a t e and rock phosphate .. 7 1 Potash (K,0) as—

Muriate 13 5 Unit values are useful for a com- parison of fertilisers of similar types and have been calculated separately for each type. I t will be appreciated t h a t it is impossible to compare, say for example, t h e nitrogen in blood a n d bone with t h a t in sulphate of ammonia, or t h e phosphoric acid in blood and bone with t h a t in superphosphate.

137

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The unit value for a given fertiliser ingredient (e.g., Nitrogen), is t h e average cost (commercial value) of each one per cent by weight per ton in the type of fertiliser being considered.

Therefore, t h e unit value for nitrogen in s u l p h a t e of ammonia, containing 20 per cent, nitrogen and costing £37 per ton, would be £37 divided by 20, or 37s.

From t h e unit values the commercial value of a fertiliser can be obtained by multiplying t h e percentage of each fertiliser ingredient by its unit value and totalling t h e result for all ingredients.

I t should be understood t h a t the unit values listed are calculated on the average quoted prices at the time of registration. Therefore, the total of t h e individual unit values in a fertiliser will not necessarily be equal to the quoted prices per ton as the calculated values are averages of all the fertilisers of t h a t class offered for sale. However, unit values approximate fairly closely to t h e fertilising value and serve as a definite guide to the relative usefulness of different mixtures for any specific purpose.

I t m u s t be remembered t h a t market values are subject to alteration and also t h a t , in t h e case of mixed fertilisers, e.g., potato manures, etc., the cost of mixing and extra handling must be added to figures arrived a t by the use of unit values.

T h e following is an example of the usefulness of unit values.

X Brand Blood a n d Bone ...

Y Brand Blood and Bone

Minimum percentages of Quoted Nitrogen. Phosphoric Price

Acid. per ton.

6.5 10 £30 5.5 13 £30 From t h e table of unit values for the current fertiliser year, it will be seen t h a t t h e unit values of nitrogen a n d phosphoric acid in blood and bone are 75s. a n d 18s. 9d., respectively. Using these figures we can now obtain the relative value of each fertiliser as fol- lows:—

X Brand Blood and Bone s. d.

6.5 units of nitrogen @ 75s.

per unit 487 6 10.0 units of phosphoric acid @

18s. 9d. per unit 187 6 Total value 675 0 Y Brand Blood and Bone 5.5 units of nitrogen @ 75s.

per unit 412 6 13.0 units of phosphoric acid @

18s. 9d. per unit 243 9 Total value 656 3 I t will be seen, therefore, t h a t as the units contained in X Brand are worth more t h a n those in Y brand, the former would be the more economical fertiliser to purchase when they are both priced at £30 per ton.

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FARMERS

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