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Tag: Phosphorous acid

27 Jul 2026
Valencia Orange Trees
By Firstfruits Consulting Website Articles , , ,

Effects of Foliar Applications of Urea or Nutriphite on Flowering and Yields of Valencia Orange Trees

Valencia orange yields have been related to the number of flowers in the spring bloom, and the number of induced flower buds is determined by climatic stress factors such as cold and drought. Winter foliar sprays of urea have been reported to enhance the number of flower buds, flowers per inflorescence and yields under California conditions. Sprays of urea (28-31 kg N/ha) or Nutriphite (6.1 l/ha of 0-28-26 product) were applied to mature Valencia trees in two locations in South Florida in 1994-95. Urea or Nutriphite applied between the dates of 25 Dec. and 11 Jan. increased flowers.

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21 May 2019
Biostimulant activity
0 Comments By Firstfruits Consulting Website Articles , , , , ,

Biostimulant activity of phosphite in horticulture

Fernando C. Gómez-Merinoa
Colegio de Postgraduados Campus Córdoba, Veracruz
Libia I. Trejo-Téllezb
Colegio de Postgraduados Campus Montecillo, Mexico

Phosphite (Phi), a reduced form of phosphate (Pi), is emerging as a novel biostimulator in horticulture. Though there is still no consensus on its physiological function as a P-source for plant nutrition, experimental evidence has shown that Phi can act as a biocide and affect plant production and productivity. Positive effects of Phi on plant metabolism are more evident when applied to the roots in hydroponic systems or to the leaves in the form of foliar sprays in the presence of sufficient Pi. Published research conclusively indicates that Phi functions as an effective pesticide against various species of pathogenic bacteria and Oomycetes. Nonetheless, the use of Phi as a sole P-source for plant nutrition is still at issue.

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