Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub


    One of the primary physiological issues with cultivation of pomegranate (Punica granatum L. cv Post Sefid Darjazin) is excessive fruit cracking. Foliar applications of chemical and organic mixtures to limit or prevent pomegranate cracking were evaluated in this work. This 2 year study (2014–2015) was conducted in Darjazin, Iran and designed to evaluate the impacts of foliar application of 2 and 5mll–1 humic acid, 6% kaolin, and 3% Calcium-1% Boron (CB) separately or in combination. Pomegranate fruits were examined under two irrigation regimes at three time periods during the growing season. It was found that 14 day irrigation periods resulted in significantly more cracking in pomegranate than standard irrigation. Increased temperatures in 2015 contributed to higher percentages of fruit cracking as well. Foliar application of 6% kaolin significantly decreased cracking in 7 day irrigation studies while 2ml l–1 humic acid, 6% kaolin, CB, and the combination of 6% kaolin/CB and 6% kaolin/2mll–1 humic acid reduced cracking under 14 day irrigation. Fruit weights significantly increased with 6% kaolin application and 7d irrigation while 5ml l–1 humic acid both increased pomegranate acidity and decreased the flavor index. Therefore, foliar application of kaolin and humic acid can reduce cracking in pomegranate fruit.

    Publication Notes

    • Check the Northern Research Station web site to request a printed copy of this publication.
    • Our on-line publications are scanned and captured using Adobe Acrobat.
    • During the capture process some typographical errors may occur.
    • Please contact Sharon Hobrla, if you notice any errors which make this publication unusable.
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Ghanbarpour, Elmira; Rezaei, Mehdi; Lawson, Shaneka. 2018. Reduction of Cracking in Pomegranate Fruit After Foliar Application of Humic Acid, Calcium-boron and Kaolin During Water Stress. Erwerbs-Obstbau. 196(8): 15-. 9 p.


    Google Scholar


    Calcium, Cracking, Humic acid, Irrigation, Kaolin, Pomegranate, Punica granatum

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page