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246336

EFFECT OF PINCHING AND FERTILIZATION TREATMENTS ON VEGETATIVE GROWTH, SEPAL PRODUCTION AND CHEMICAL COMPOSITION OF ROSELLE (Hibiscus sabdariffa L.)

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Last updated: 04 Jan 2025

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Abstract

This study was conducted in the Experimental Nursery of the Ornamental
Horticulture Department, Faculty of Agriculture, Cairo University Giza, during the two
successive seasons or 1999 and 2000, with the aim of investigaling the effect of
manual and chemical pinching (using foliar kinetin application), as well as NPK and
biofertilization treatments, on growth, sepal production and chemical composition of
roselle (Hibiscus sabdariffa L. var. sabdariffa, cv. Sabahia 17. dark color). Roselle (Hibiscus sabdariffa L.) plants were either: (1) left unpinched, (2)
pinched manually (twice: one month after planting, and one month later), or (3)
pinched chemically using foliar spray applications of lIinetin at concentrations of 15,
30 or 45 ppm (3 applications, at 15 day intervals, starting 30 days from planting).
Also, the plants were supplied with NPK fertilization [using ammonium sulphate
(20.5% N) at 400 kglfed., calcium superphosphate (15.5% P20~) at 150 kg/fed., and
potassium sulphate (48% K20) at 50 kg/ fed.], or with biofertilizatfon (alone or In
ccrnblnation with NPK fertilization at 100% or 50% of the above rates). Plants
suppliad with 100% NPK (with no blofertilization) were used as the control. In
treatments indudlng biofertilization, the biofertillzer (a mixture of vermiculite and
Azotobacter chroococcum, at a concentration of 109 bacterialg vermiculite) was
mixed with the seeds prior to planting at a rate 500 g bioferillizer/250 9 seeds. In
addition. biofertllization was applied after planling as a liquid top dressing 3 times/
season (at 30 day in\eNals). The Hquid inoculum consisted of a mix'Lure 01 molasses
and Az%bacter chroococcum.                       Among the different manual and chemical pinching treatments, appllcation          \ of kinetin at 15 ppm gave the highest values (or most of the studied growth and yield
charaeterlsucs (plant height. number of branches. leaves and fruits/plant, as well as         fresh and dry weights of leaves and sepals/plant). Kinetin at 15 ppm also increased          \ the leaf contents of total chlorophyll, carotenoids, total carbohydrates, N. P and K, as well as the total acidity and anthocyanin contents of the sepals. Supplying the plants with 100% NPK + biofertllization gave the highest values for number of branches.         leaves and fruits/plant. fresh and dry weights of leaves/plant, the contents of total              \ carbohydrates, P and K In Ihe leaves, as well as the anthocyanin content in the
sepals, compared to all other fertilization treatments. However, using 50% HPK +
biofertili:ation gave the highest fresh and dry weights of sepals/ptant, and         insignificantly increased the number of branchesrplaru, compared to those formed on        \ plants fertilized with 100% NPK alone (control plants), l.e. biofertitization reduced the need for chemical NPK fertilization (for branching and sepals production) by at least         50%. Fertilization with 50% NPK .•. biofertilization also gave the highest contents of           \ total chlorophyll and N In the leaves, as well as the highest total acidity and total
soluble solids contents in the sepals. Moreover. combining kinetin al15 ppm with
application of 50% NPK .•. biofertilizalion gave the best results, in terms of number of
branches and fruits/ptant. fresh and dry weights of sepals/plant, 

DOI

10.21608/jpp.2003.246336

Authors

First Name

H.

Last Name

Mansour,

MiddleName

A.

Affiliation

Ornarnental Horticulture Department, Faculty of Agriculture, Cairo University

Email

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City

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Orcid

-

First Name

Safia

Last Name

EI-Hanafy

MiddleName

H.

Affiliation

Ornarnental Horticulture Department, Faculty of Agriculture, Cairo University

Email

-

City

-

Orcid

-

First Name

S.

Last Name

Milad

MiddleName

M. N.

Affiliation

Ornarnental Horticulture Department, Faculty of Agriculture, Cairo University

Email

-

City

-

Orcid

-

Volume

28

Article Issue

12

Related Issue

35268

Issue Date

2003-12-01

Receive Date

2003-11-15

Publish Date

2003-12-01

Page Start

8,281

Page End

8,305

Print ISSN

2090-3669

Online ISSN

2090-374X

Link

https://jpp.journals.ekb.eg/article_246336.html

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https://jpp.journals.ekb.eg/service?article_code=246336

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5

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Original Article

Type Code

887

Publication Type

Journal

Publication Title

Journal of Plant Production

Publication Link

https://jpp.journals.ekb.eg/

MainTitle

EFFECT OF PINCHING AND FERTILIZATION TREATMENTS ON VEGETATIVE GROWTH, SEPAL PRODUCTION AND CHEMICAL COMPOSITION OF ROSELLE (Hibiscus sabdariffa L.)

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Article

Created At

22 Jan 2023