Abstract
Abstract Marketing of phosphite‐containing preparations for foliar application, together with recent reports of positive yield responses, has revived the question as to whether phosphite (HPO $ _3^- $ ) is a suitable P source for plants. Two experiments using zucchini ( Cucurbita pepo L. convar. giromontina ) have been conducted to evaluate the P‐nutritional effect of phosphite either provided via the substrate or as a foliar spray. Plants grown in a P‐deficient substrate were severely damaged when phosphite was applied as foliar fertiliser and more drastically when provided via the substrate. Growth of P‐deficient plants receiving phosphite as a foliar spray was impaired in a dose‐dependent manner after foliar P application (concentrations 0.0, 0.9, 2.7, and 4.5 g P L –1 ), while foliar provision of phosphate improved plant growth and yield. In the youngest leaves of phosphite‐treated plants, which had developed after foliar spray, phosphite accumulated to considerable extent, reaching a similar concentration as phosphate at tissue level. These results confirm that P‐deficient plants are very sensitive to phosphite, which represents a nutritionally ineffective form of P. It should thus not be considered as a form of P suitable for fertiliser manufacture.
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Claims 7
Claim · model-written summary
Foliar phosphite severely damaged P-deficient zucchini, more drastically when supplied via the substrate.
- Taxon
- zucchini
Cucurbita pepo subsp. pepoe2 - Treatment
- phosphite was applied as foliar fertilisere1
- Outcome
- damagee1
- Direction
- severely damagede1
- Qualifier
- P‐deficient substratee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Plants grown in a P‐deficient substrate were severely damaged when phosphite was applied as foliar fertiliser and more drastically when provided via the substrate”
e2“Two experiments using zucchini”
Claim · model-written summary
Growth of P-deficient zucchini receiving foliar phosphite was impaired in a dose-dependent manner.
- Taxon
- zucchiniCucurbita pepo subsp. pepoe2
- Treatment
- phosphite as a foliar spraye3
- Outcome
- Growthe3
- Direction
- impairede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Growth of P‐deficient plants receiving phosphite as a foliar spray was impaired in a dose‐dependent manner after foliar P application”
e2“Two experiments using zucchini”
Claim · model-written summary
Foliar provision of phosphate improved zucchini growth and yield.
- Taxon
- zucchiniCucurbita pepo subsp. pepoe2
- Treatment
- foliar provision of phosphatee4
- Outcome
- plant growth and yielde4
- Direction
- improvede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“foliar provision of phosphate improved plant growth and yield”
e2“Two experiments using zucchini”
Claim · model-written summary
Phosphite accumulated in the youngest leaves of phosphite-treated zucchini to a concentration similar to phosphate at tissue level.
- Taxon
- zucchiniCucurbita pepo subsp. pepoe2
- Organ / stage
- youngest leavese5
- Outcome
- phosphite accumulatede5
- Comparator
- phosphatee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“In the youngest leaves of phosphite‐treated plants, which had developed after foliar spray, phosphite accumulated to considerable extent, reaching a similar concentration as phosphate at tissue level”
e2“Two experiments using zucchini”
Claim · model-written summary
Phosphite should not be considered a form of P suitable for fertiliser manufacture.
- Taxon
- zucchiniCucurbita pepo subsp. pepoe2
- Outcome
- form of P suitable for fertiliser manufacturee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“It should thus not be considered as a form of P suitable for fertiliser manufacture”
e2“Two experiments using zucchini”
Claim · model-written summary
P-deficient zucchini are very sensitive to phosphite.
- Taxon
- zucchiniCucurbita pepo subsp. pepoe2
- Treatment
- phosphitee7
- Outcome
- very sensitivee7
- Qualifier
- P‐deficient plantse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“These results confirm that P‐deficient plants are very sensitive to phosphite, which represents a nutritionally ineffective form of P”
e2“Two experiments using zucchini”
Claim · model-written summary
Phosphite represents a nutritionally ineffective form of P for zucchini.
- Taxon
- zucchiniCucurbita pepo subsp. pepoe2
- Outcome
- nutritionally ineffective form of Pe7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“These results confirm that P‐deficient plants are very sensitive to phosphite, which represents a nutritionally ineffective form of P”
e2“Two experiments using zucchini”
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application · yield · Cucurbita pepoResults agree
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See all 8 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.