Agricultural uses of plant biostimulants

Pamela Calvo, Louise M. Nelson, Joseph W. Kloepper · Plant and Soil · 2014 · plant-science · 10.1007/s11104-014-2131-8 · record calvo2014-agricultural-uses-of-plant-biostim
tag layer · index · concepts · authors · עברית
Where this record's text came from. 2026-08-20, 2026-08-25 and 2026-08-26 schema-0.3 passes: every quote verified as an exact substring of the staged text and anchored at merge time; concept terms verified present; every edge endpoint an existing node.
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How to read this page. The article itself is not reproduced here — this paper is not cleared for redistribution, so what follows is the tag layer alone. The evidence sentences are withheld with the article. The table at the foot lists every tag the record carries; each row names the facet it belongs to, and the whose words column says whether the tag records the paper's own wording or the tagger's sentence about the paper. Every tag links to each other paper in the corpus carrying it. The machine-readable edition of the same thing is the TEI file beside this one, where the tags live in standOff, and the article is at its publisher via the link below. When we have changed our mind. Some entries in the table begin with a word in capitals and the reason for it. EVIDENCE CORRECTED — the finding still stands, but we had quoted the wrong sentence from the paper, and the quotation has been replaced with the right one. RETRACTED — the entry itself was wrong; it stays on the page, marked, with the reason, rather than being deleted. WITHDRAWN AND REPLACED — the entry was wrong, and a corrected version of it appears in the entries below. Each mark carries its own reason, in brackets, because the reasons differ from one entry to the next. An entry we have WITHDRAWN is removed from this page and kept in the record, with its reason. A line reading Audit and a date is a later re-reading of the entry against its whole sentence: DOUBTFUL means it was kept, and the reason says what is loose about it. Quotation marks inside the tagger's sentence. Where a tag is the tagger's own sentence, a phrase in quotation marks inside it is borrowed from the paper — the tagger's wording around it is not. The paper's own sentence is the evidence quote for that row; on this page it is withheld with the article, and the article is at its publisher. Nothing inside quotation marks anywhere on this page is ours: if it is quoted, it is the paper's. Whose words a concept carries. A concept entry records a term the paper itself uses, so the term, the sense given for it, and its evidence are the paper's own words, quoted where the paper fixes them. This is the opposite of a sense entry in the tag table, which is the tagger's sentence about how the paper uses a term. Where a concept entry could not be grounded in the paper's words, the entry says so on its own row.

Tags on this paper

Every tag the record carries, each linking to every other paper in the corpus that carries it. A tag appears here whether or not its words occur in the article — the spans below are only the ones a sentence in this paper licenses. Of the 22 concept tags on this paper, all 22 are grounded in a quoted sentence. 4 carry the tagger's gloss of what the term means in this paper, which is not something the article can license.
plant biostimulants EBIC biostimulant coalition biological control fertilisers plant nutrients microbial inoculants humic acids fulvic acids protein hydrolysates seaweed extracts abiotic stress nutrient efficiency crop quality rhizosphere nutrient uptake stress tolerance root growth siderophores root exudates phytase THE EUROPEAN BOUNDARY IS REGULATORY, NOT BIOLOGICAL: the definition excludes direct action against pests, which is what keeps biostimulants outside the pesticide framework rather than any claim about how they work THE NORTH AMERICAN BOUNDARY IS A CLAIM RESTRICTION: a biostimulant may enhance the plant's ability to assimilate nutrients but may make no nutrient claim, so the line is drawn at what may be asserted on the label A COMMON RESPONSE PROFILE ACROSS UNRELATED INPUTS: five categories with nothing chemical in common are reported to produce the same three effects - increased root growth, enhanced nutrient uptake, stress tolerance biofertilizers review
Method, as described: critical review of refereed publications, category by category, building on du Jardin's bibliographic analysis

Legend

claim typeclaim_typethe shape of the claim: existence, mechanism, method, critique, prediction, null
concept edgeconcept_edgesan asserted relation between two concepts, with the sentence asserting it
conceptconceptsan idea the paper works with, quoted where the paper uses it
content tagcontent_tagsa finding, definition, quantity, statistic or variable named in the paper
contributioncontributionwhat the paper claims to add
controlcontrolsan experiment run to eliminate a rival explanation
limitationlimitationswhat the paper says its evidence cannot support
mechanismmechanismshow the reported effect is said to come about
methodmethodhow the paper produced its evidence
object of studyobject_of_studywhat the paper is about — the thing it investigates
phenomenonphenomenonthe effect or regularity under study
research questionresearch_questionthe question the paper sets itself
sensesensesa distinct use of a term, quoted where the paper fixes it

The paper

The full text is not reproduced here. This article is not cleared for redistribution, so the page carries the tag layer only. Its evidence sentences are withheld; the grounding status remains with each tag, and the article itself is at https://doi.org/10.1007/s11104-014-2131-8. The reading view exists for the papers whose licence permits it.

Every tag on this page

claim_type 1 · concept_edges 8 · concepts 22 · content_tags 6 · contribution 1 · controls 1 · limitations 8 · mechanisms 7 · method 1 · object_of_study 1 · phenomenon 1 · research_question 1 · senses 5

Relations on this page carry a quotation for the claim. Where a relation was separately evidenced — and so tested against the vocabulary for its type — the row says so; none of 8 relations here carry that mark. The rest are the tagger’s reading of the sentence quoted beside them.

This record holds no relations between claims. A layer is empty when the tagger recorded nothing in it — which is not the same as the paper having nothing to record.

facettagfieldconf.whose words
object_of_studyfive categories of plant biostimulant - microbial inoculants, humic acids, fulvic acids, protein hydrolysates and amino acids, seaweed extracts
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
object_of_studythe paper's words
research_questionwhat the refereed literature actually supports for each category of biostimulant, given definitions supplied by industry consortia
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
research_questionthe paper's words
contributiona critical review organised by the two consortium definitions, reporting a common response profile across chemically unrelated inputs
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
contributionthe paper's words
claim_typecritique
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claim_typethe paper's words
phenomenonenhancement of plant growth by substances and microorganisms that are neither fertilisers nor pesticides
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phenomenonthe paper's words
methodreview
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also in: review
methodthe paper's words
mechanismsmechanisms
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
mechanisms[0]0.95the tagger's words
mechanismsmechanisms
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
mechanisms[1]0.95the tagger's words
mechanismsmechanisms
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
mechanisms[2]0.9the tagger's words
mechanismsfour named routes by which an inoculant promotes growth: asymbiotic nitrogen fixation, nutrient solubilisation, iron sequestration by siderophores, and volatile organic compounds
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
mechanisms[3]0.95the tagger's words
mechanismsorganic acids free bound phosphate two ways at once - their hydroxyl and carboxyl groups chelate the cations holding it, and they lower the surrounding soil pH
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
mechanisms[4]0.95the tagger's words
mechanismswhich organic acid a microbe releases depends on the species, so the solubilising mechanism is strain-specific rather than generic
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
mechanisms[5]0.95the tagger's words
mechanismsphosphorus fertiliser can be present and still unavailable because it binds to soil particles - the problem is chemical form, not quantity
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
about this quote: PAGE FURNITURE IS SPLICED INTO THE 'evidence' QUOTE - a page number and the journal's running head: '6 Plant Soil (2014) 383:3–41'. The words on either side of it were never continuous on the page; read the quote with it deleted.
mechanisms[6]0.95the tagger's words
limitationsThe definition of the review's own object is stated to be UNSETTLED - still evolving, and partly because the inputs it covers have little in common
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
limitations[0]0.95the tagger's words
limitationsThe field's evidence base is described by the paper itself as widely considered to lack peer-reviewed scientific evaluation
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
about this quote: the quote carries a spurious space inside a word (taxonomy shape 8): the paper's “community” is staged as “comm unity”. Verbatim against the staged text; the sentence cannot be re-sliced around it because the damage is mid-clause. Confidence 0.85 under an earlier note of ours.
limitations[1]0.85the tagger's words
limitationsThe review's scope is INHERITED from two industry consortia rather than set by the authors - what counts as a biostimulant here is what EBIC and the biostimulant coalition say it is
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
limitations[2]0.95the tagger's words
limitationsThe combination of categories, which the paper names as the obvious next step, is offered as theoretical - no combined trial is reviewed
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
limitations[3]0.95the tagger's words
limitationsnitrogen fixation does NOT account for all the growth promotion attributed to Azospirillum - stated plainly against the mechanism the genus is famous for
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
limitations[4]0.95the tagger's words
limitationsthe plant species or cultivar can itself decide whether a biofertilizer produces any benefit
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
limitations[5]0.95the tagger's words
limitationseffects must be tested for reproducibility across a range of soil types and environmental conditions before an inoculant can be relied on
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
limitations[6]0.95the tagger's words
limitationsthe organism has to survive the commercial formulation and stay compatible with the fertilisers and crop protection chemicals already in use
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
limitations[7]0.9the tagger's words
controlsstressed plants grown with and without humic acid, with abscisic acid measured in both
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
eliminates: the stress response itself as the explanation - ABA is similar in both, so what humic acid changes is not the plant's stress signalling · outcome (stated by the tagger, no quotation): held
controls[0]0.85the tagger's words
conceptsplant biostimulants
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
concepts[0]0.95the paper's words
conceptsEBIC
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: EBIC
concepts[1]0.85the paper's words
conceptsbiostimulant coalition
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
concepts[2]0.95the paper's words
conceptsbiological control
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
concepts[3]0.85the paper's words
conceptsfertilisers
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: fertilisers
concepts[4]0.95the paper's words
conceptsplant nutrients
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
concepts[5]0.95the paper's words
conceptsmicrobial inoculants
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
concepts[6]0.95the paper's words
conceptshumic acids
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: humic acids
concepts[7]0.95the paper's words
conceptsfulvic acids
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: fulvic acids
concepts[8]0.95the paper's words
conceptsprotein hydrolysates
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
concepts[9]0.95the paper's words
conceptsseaweed extracts
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
concepts[10]0.95the paper's words
conceptsabiotic stress
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
concepts[11]0.95the paper's words
conceptsnutrient efficiency
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
concepts[12]0.95the paper's words
conceptscrop quality
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: crop quality
concepts[13]0.95the paper's words
conceptsrhizosphere
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: rhizosphere
concepts[14]0.95the paper's words
conceptsnutrient uptake
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
concepts[15]0.95the paper's words
conceptsstress tolerance
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
concepts[16]0.95the paper's words
conceptsroot growth
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: root growth
concepts[17]0.95the paper's words
conceptsmicrobial inoculants
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
concepts[18]0.95the paper's words
conceptssiderophores
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: siderophores
concepts[19]0.9the paper's words
conceptsroot exudates
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: root exudates
concepts[20]0.9the paper's words
conceptsphytase
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
also in: phytase
concepts[21]0.9the paper's words
sensesplant biostimulant - THE EUROPEAN (EBIC) SENSE: defined by FUNCTION and fenced off from pesticides by regulation - substances or microorganisms that stimulate natural processes, with no direct action against pests
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
senses[0]0.95the tagger's words
sensesplant biostimulant - THE NORTH AMERICAN (coalition) SENSE: defined by what it is APPLIED TO and fenced off from fertilisers by claim - may enhance nutrient assimilation, but is not a plant nutrient and may make no nutrient claim. TWO INDUSTRY CONSORTIA, ONE TERM, AND THE BOUNDARY IS DRAWN AGAINST A DIFFERENT NEIGHBOUR ON EACH SIDE OF THE ATLANTIC
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
senses[1]0.95the tagger's words
sensesplant biostimulant - the paper's own position: A CONCEPT STILL EVOLVING, and the review is written from the two consortium definitions rather than from one of its own
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
senses[2]0.95the tagger's words
sensesbiostimulant - THIS REVIEW'S SCOPE DECISION: a biofertilizer counts as a biostimulant, a boundary other definitions of the same term explicitly deny
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
senses[3]0.95the tagger's words
sensesbiofertilizer - a LIVING product, defined by the mechanisms through which it promotes growth rather than by what it contains
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
senses[4]0.95the tagger's words
concept_edgesplant biostimulants —distinct-from→ biological control
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
strength of the relation: 0.9
concept_edges[0]the tagger's words
concept_edgesplant biostimulants —distinct-from→ fertilisers
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
strength of the relation: 1 Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but the span writes 'biostimulants', not 'plant biostimulants'.
concept_edges[1]the tagger's words
concept_edgesplant biostimulants —distinct-from→ plant nutrients
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
strength of the relation: 1 Audit 2026-09-28: DOUBTFUL - read against its full span and kept, but the span writes 'biostimulants', not 'plant biostimulants'.
concept_edges[2]the tagger's words
concept_edgesmicrobial inoculants —part-of→ plant biostimulants
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
strength of the relation: 1
concept_edges[3]the tagger's words
concept_edgeshumic acids —part-of→ plant biostimulants
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
strength of the relation: 1
concept_edges[4]the tagger's words
concept_edgesfulvic acids —part-of→ plant biostimulants
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
strength of the relation: 1
concept_edges[5]the tagger's words
concept_edgesprotein hydrolysates —part-of→ plant biostimulants
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
strength of the relation: 1
concept_edges[6]the tagger's words
concept_edgesseaweed extracts —part-of→ plant biostimulants
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
strength of the relation: 1
concept_edges[7]the tagger's words
content_tagsAzospirillum contributed 7-12% of wheat's total nitrogen.
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.findings[0]0.95the tagger's words
content_tagsA three-strain Bacillus PGPR mixture promoted tomato growth and increased uptake of 15N-depleted fertilizer.
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.findings[1]0.9the tagger's words
content_tagsPhytates make up to 60% of soil organic phosphorus.
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.findings[2]0.95the tagger's words
content_tagsbiofertilizer defined by its mechanisms - increasing nutrient supply, root biomass or area, and uptake capacity
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.definitions[0]0.95the tagger's words
content_tagsthe share of total plant nitrogen attributable to Azospirillum fixation in wheat against sugarcane
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.quantities[0]0.95the tagger's words
content_tagsorganic phosphorus as a share of soil phosphorus
Quotation withheld — this record is not cleared for redistribution. The sentence is in the paper at the link above.
content_tags.quantities[1]0.95the tagger's words

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