548:
190:(S, Ca, Mg) may add more numbers to the N-P-K ratio to indicate the amount. The additional numbers are similarly reported in the oxide mass fraction form. For example, a Polish fertilizer labeled "NPK (Ca,S) 4-12-12 (14-29)" has an equivalent of 14% soluble
288:) for every chlorine atom (whose atomic mass is 35.45 g/mol). Therefore, pure KCl is 39.09/(39.09 + 35.45) = 52% potassium and 48% chlorine by weight. Its K value is therefore 52/0.83 = 63; that is, a fertilizer that gets all its potassium from
179:, fertilizer labeling regulations allow for reporting the elemental mass fractions of phosphorus and potassium. The regulations stipulate that this should be done in parentheses after the standard N-P-K values, as in "15-30-15 (15-13-13)".
604:
182:
In
Australia, macronutrient fertilizers are labeled with an "N-P-K-S" system, which uses elemental mass fractions rather than the standard N-P-K values and includes the amount of sulfur (S) contained in the fertilizer.
611:
230:
consists of 56.4% elemental oxygen and 43.6% elemental phosphorus by weight. Therefore, the elemental phosphorus percentage of a fertilizer is 0.436 times its P value.
314:. Pure KCl fertilizer would thus be labeled 0-0-63. Since sylvite contains other compounds that contribute no N, P, or K, it is usually labeled 0-0-60.
687:
755:
245:
consists of 17% oxygen and 83% elemental potassium by weight. Therefore, the elemental potassium percentage is 0.83 times the K value.
206:
The values in an NPK fertilizer label are related to the concentrations (by weight) of phosphorus and potassium elements as follows:
576:
838:
791:
86:
More precisely, the first number ("N value") is the percentage of elemental nitrogen by weight in the fertilizer; that is, the
249:
The N value in NPK labels represents actual percentage of nitrogen element by weight, so it does not need to be converted.
816:
789:, Bulletin ID-101 (Reviewed 02/05/01), Cooperative Extension Service, Purdue University. West Lafayette, IN 47907
87:
785:
from "Average total N, ammonium N, phosphate and potash content of manure at the time of land application" in
695:
79:
Fertilizers are usually labeled with three numbers, as in 18-20-10, indicating the relative content of the
393:
387:
421:
636:
843:
399:
91:
31:
759:
355:
848:
447:
273:
408:
381:
346:
52:
663:
133:
For example, a 15-13-20 fertilizer would contain 15% by weight of nitrogen, 13% by weight of
362:
591:
580:
527:
340:
195:
187:
115:
80:
610:. Australian Government Department of Agriculture, Fisheries and Forestry. Archived from
43:
to indicate their contents of major nutrients. The most common labeling convention, the
569:
414:
832:
191:
90:
of nitrogen times 100. The second number ("P value") is the percentage by weight of
795:
716:
494:
285:
277:
506:
459:
59:
754:
George Rehm; Michael
Schmitt; John Lamb; Gyes Randall; Lowell Busman (2002).
485:
467:
63:
55:
453:
367:
35-0-0 Ureaform (~85% slow release, sparingly soluble ureaformaldehyde)
268:
741:
Bat and seal guano are lower in fertilizer value than bird guano. see
605:"National Code of Practice for Fertilizer Description & Labelling"
551:. Fertilizer Industry Federation Association (FIFA). 15 September 2008
443:
0-3-0 to 0-8-0 Raw
Phosphate Rock (would be 0-34-0 if it were soluble)
301:
and has the same potassium contents as pure KCl would have to be 63%
276:, KCl. Pure potassium chloride contains one potassium atom (whose
17:
742:
438:
528:"Voluntary Standards for the Fertilizer and Supplements Industry"
374:
281:
176:
549:"Draft Code of Practice for Fertilier Description and Labeling"
83:
nitrogen (N), phosphorus (P), and potassium (K), respectively.
817:
114:. The third number ("K value") is the equivalent content of
758:. University of Minnesota Extension Service. Archived from
252:
So, for example, an 18−51−20 fertilizer contains by weight
526:
Chambers, Albert; Sally
Rutherford (27 November 2007).
272:
is a naturally occurring mineral consisting mostly of
652:Lubofoska is a fertilizer applied before sowing...
351:30-0-0 to 40-0-0 Sulfur-coated urea (slow release)
27:NPK and other labeling conventions for fertilizer
417:(Monocalcium phosphate monohydrate with gypsum)
8:
323:NPK values for various synthetic fertilizers
592:UK Fertilizers Regulations 1990, Schedule 2
202:Converting nutrient analysis to composition
787:Animal Manure As a Plant Nutrient Resource
427:0-0-22 Potassium magnesium sulfate (K-mag)
370:40-0-0 Methylene ureas (~70% slow release)
259:0.436 × 51 = 22% elemental phosphorus, and
30:"NPK" redirects here. For other uses, see
781:
779:
777:
432:NPK values for mined fertilizer minerals
518:
756:"Understanding Phosphorus Fertilizers"
688:"Food for turf: Slow-release nitrogen"
686:J. B. Sartain, University of Florida,
637:"NPK (Ca,S) 4-12-12 (14-29) Lubofoska"
681:
679:
677:
675:
318:NPK values for commercial fertilizers
39:Many countries have standardized the
7:
262:0.83 × 20 = 17% elemental potassium.
167:, and 52% of some inert ingredient.
424:(Monocalcium phosphate monohydrate)
266:As another example, the fertilizer
25:
1:
723:. Royal Horticultural Society
717:"Fertiliser labels explained"
820:www.harrodhorticultural.com
70:Common labeling conventions
51:, shows the amounts of the
865:
171:Other labeling conventions
29:
822:accessed 15 December 2022
669:accessed 15 December 2022
490:5-5-6 Fish blood and bone
188:additional macronutrients
579:28 October 2014 at the
437:11-8-2 to 16-12-3 bird
256:18% elemental nitrogen,
41:labeling of fertilizers
839:Agricultural chemicals
470:fertilizers and others
394:Monoammonium phosphate
388:Ammonium polyphosphate
81:primary macronutrients
75:The NPK analysis label
422:Triple superphosphate
481:3-2-2 poultry manure
400:Diammonium phosphate
154:, 20% by weight of
92:phosphorus pentoxide
32:NPK (disambiguation)
762:on 5 September 2013
692:Grounds Maintenance
617:on 28 February 2015
398:18-46-0 to 21-54-0
392:11-48-0 to 11-55-0
386:10-34-0 to 11-37-0
358:(~90% slow release)
356:Isobutylidenediurea
698:on 29 October 2019
667:chemicalland21.com
478:1-0-1 horse manure
475:9-0-0 dairy manure
448:Potassium chloride
274:potassium chloride
573:www.flairform.com
570:nutrient_analysis
420:0-44-0 to 0-52-0
413:0-17-0 to 0-22-0
409:Potassium nitrate
382:Anhydrous ammonia
361:33-0-0 to 34-0-0
347:Ammonium sulphate
186:Fertilizers with
53:chemical elements
16:(Redirected from
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798:on 12 March 2012
794:. Archived from
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664:NPK (Fertilizer)
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594:Part 1, Para. 7.
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466:NPK values for
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341:Calcium nitrate
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116:potassium oxide
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415:Superphosphate
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404:7-7-7 Growmore
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194:and 29% total
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88:mass fraction
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800:. Retrieved
796:the original
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764:. Retrieved
760:the original
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725:. Retrieved
720:
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700:, retrieved
696:the original
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644:. Retrieved
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631:
619:. Retrieved
612:the original
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553:. Retrieved
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531:. Retrieved
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85:
78:
48:
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40:
38:
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844:Fertilizers
646:15 December
495:Milorganite
278:atomic mass
49:N-P-K label
833:Categories
802:28 October
766:28 October
727:31 October
721:RHS Advice
702:28 October
621:27 October
555:3 February
533:3 February
513:References
507:Fertilizer
460:Carnallite
60:phosphorus
849:Packaging
486:Bone meal
468:biosolids
280:is 39.09
64:potassium
792:"ID-101"
577:Archived
501:See also
407:13-0-44
56:nitrogen
484:4-12-0
458:0-0-17
454:Kainite
452:0-0-19
446:0-0-60
380:82-0-0
373:46-0-0
354:31-0-0
345:21-0-0
339:15-0-0
269:sylvite
175:In the
493:6-2-0
377:(U-46)
327:": -->
62:, and
743:Guano
615:(PDF)
608:(PDF)
439:guano
804:2014
768:2014
729:2021
704:2014
648:2022
623:2014
557:2010
535:2010
375:Urea
329:edit
177:U.K.
286:mol
47:or
45:NPK
18:NPK
835::
776:^
719:.
690:,
674:^
650:.
639:.
198:.
130:.
66:.
58:,
806:.
770:.
731:.
625:.
559:.
537:.
333:]
312:O
308:2
303:K
299:O
295:2
290:K
284:/
282:g
243:O
239:2
234:K
225:5
220:O
216:2
211:P
165:O
161:2
156:K
149:5
144:O
140:2
135:P
128:O
124:2
119:K
109:5
104:O
100:2
95:P
34:.
20:)
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