Abstract
Abstract In an experiment widely discussed in the literature involving Valencia orange trees, N, P and K fertilizers were applied in factorial combinations. Individual responses were 6, 5 and 23 per cent respectively for the N, P and K. The total response when all three were applied simultaneously was 40 per cent compared with the 37 per cent predicted by sequential additivity or 34 per cent for simple addition. The individual responses for the three when applied together were 8, 7 and 26 respectively for N, P and K. When K and P and also K and N were combined, the interactions were also sequentially additive. The N, P and K in all these treatments were Mitscherlich‐type limiting factors. When N and P were applied together without K, a severe antagonism resulted with large yield decrease. Addition of K to this treatment resulted in a 69 per cent yield increase. Potassium was a Liebig‐type limiting factor only to N and P together, but not to N or P individually. An alternative procedure to DRIS analysis is suggested.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 12
Claim · model-written summary
Applied individually, N fertilizer gave a response of 6 per cent in Valencia orange.
- Taxon
- Valencia orange
Citrus sinensise0 - Treatment
- Ne1
- Outcome
- Individual responsese1
- Direction
- increaseinferrede1
- Value
- 6e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Valencia orange trees”
e1“Individual responses were 6, 5 and 23 per cent respectively for the N, P and K”
Claim · model-written summary
Applied individually, P fertilizer gave a response of 5 per cent in Valencia orange.
- Taxon
- Valencia orangeCitrus sinensise0
- Treatment
- Pe1
- Outcome
- Individual responsese1
- Direction
- increaseinferrede1
- Value
- 5e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Valencia orange trees”
e1“Individual responses were 6, 5 and 23 per cent respectively for the N, P and K”
Claim · model-written summary
Applied individually, K fertilizer gave a response of 23 per cent in Valencia orange.
- Taxon
- Valencia orangeCitrus sinensise0
- Treatment
- Ke1
- Outcome
- Individual responsese1
- Direction
- increaseinferrede1
- Value
- 23e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Valencia orange trees”
e1“Individual responses were 6, 5 and 23 per cent respectively for the N, P and K”
Claim · model-written summary
The total response to N, P and K applied simultaneously was 40 per cent, compared with 37 per cent predicted by sequential additivity and 34 per cent by simple addition.
- Taxon
- Valencia orangeCitrus sinensise0
- Treatment
- all three were applied simultaneouslye1
- Outcome
- total responsee1
- Direction
- higherinferrede1
- Value
- 40 per cente1
- Qualifier
- 37 per cent predicted by sequential additivity or 34 per cent for simple additione1
- Comparator
- sequential additivitye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Valencia orange trees”
e1“The total response when all three were applied simultaneously was 40 per cent compared with the 37 per cent predicted by sequential additivity or 34 per cent for simple addition”
Claim · model-written summary
When N, P and K were applied together, the individual response to N was 8 in Valencia orange.
- Taxon
- Valencia orangeCitrus sinensise0
- Treatment
- Ne1
- Outcome
- individual responsese1
- Direction
- increaseinferrede1
- Value
- 8e1
- Qualifier
- applied togethere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Valencia orange trees”
e1“The individual responses for the three when applied together were 8, 7 and 26 respectively for N, P and K”
Claim · model-written summary
When N, P and K were applied together, the individual response to P was 7 in Valencia orange.
- Taxon
- Valencia orangeCitrus sinensise0
- Treatment
- Pe1
- Outcome
- individual responsese1
- Direction
- increaseinferrede1
- Value
- 7e1
- Qualifier
- applied togethere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Valencia orange trees”
e1“The individual responses for the three when applied together were 8, 7 and 26 respectively for N, P and K”
Claim · model-written summary
When N, P and K were applied together, the individual response to K was 26 in Valencia orange.
- Taxon
- Valencia orangeCitrus sinensise0
- Treatment
- Ke1
- Outcome
- individual responsese1
- Direction
- increaseinferrede1
- Value
- 26e1
- Qualifier
- applied togethere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Valencia orange trees”
e1“The individual responses for the three when applied together were 8, 7 and 26 respectively for N, P and K”
Claim · model-written summary
The interactions of K with P and of K with N were also sequentially additive.
- Taxon
- Valencia orangeCitrus sinensise0
- Outcome
- interactionse1
- Qualifier
- sequentially additivee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Valencia orange trees”
e1“When K and P and also K and N were combined, the interactions were also sequentially additive”
Claim · model-written summary
When N and P were applied together without K, a severe antagonism resulted, with a large yield decrease.
- Taxon
- Valencia orangeCitrus sinensise0
- Treatment
- N and P were applied together without Ke1
- Outcome
- yielde1
- Direction
- decreasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Valencia orange trees”
e1“When N and P were applied together without K, a severe antagonism resulted with large yield decrease”
Claim · model-written summary
Adding K to the N plus P treatment resulted in a 69 per cent yield increase.
- Taxon
- Valencia orangeCitrus sinensise0
- Treatment
- Addition of Ke1
- Outcome
- yielde1
- Direction
- increasee1
- Value
- 69 per cente1
- Comparator
- this treatmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Valencia orange trees”
e1“Addition of K to this treatment resulted in a 69 per cent yield increase”
Claim · model-written summary
Potassium was a limiting factor only for N and P together, not for N or P individually.
- Taxon
- Valencia orangeCitrus sinensise0
- Outcome
- limiting factore1
- Qualifier
- only to N and P together, but not to N or P individuallye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Valencia orange trees”
e1“limiting factor only to N and P together, but not to N or P individually”
Claim · model-written summary
The authors suggest an alternative procedure to DRIS analysis.
- Taxon
- Valencia orangeCitrus sinensise0
- Outcome
- alternative procedure to DRIS analysise1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Valencia orange trees”
e1“An alternative procedure to DRIS analysis is suggested”
The same questions in other papers
nitrogen · yield · Citrus sinensis (sweet orange)Results differ
8 papers in the same direction as this paper · 39 in the opposite direction
- positive
- positive
- positive
44 papers more in this group
See all 48 papers →phosphorus · yield · Citrus sinensis (sweet orange)Positive and negative results
6 in the opposite direction
- positive
- positive
- positive
3 papers more in this group
See all 7 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.