Journal
JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE
Volume 172, Issue 6, Pages 821-828Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jpln.200800287
Keywords
foliar fertiliser; zucchini; P fertilisation; phosphorous acid; flowering; Cucurbita pepo L. convar. giromontina
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Marketing of phosphite-containing preparations for foliar application, together with recent reports of positive yield responses, has revived the question as to whether phosphite (HPO3-) 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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