TITLE:
Yield of Roselle (Hibiscus sabdariffa L.) as Influenced by Manure and Nitrogen Fertilizer Application
AUTHORS:
Julius Yirzagla, Peter Quandahor, Ophelia Asirifi Amoako, Listowel Atiwin Akologo, John Bokaligidi Lambon, Abdul-Wahab M. Imoro, Kwadwo Gyasi Santo, Olivia Aguriboba Akanbelum
KEYWORDS:
Calyx Yield, “Sobolo”, Sepals, Cowdung, Nitrogen Fertilizer
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.14 No.5,
May
26,
2023
ABSTRACT: Field experiments were carried out on roselle (Hibiscus
sabdariffa L) during the 2019 and 2020 cropping seasons at the CSIR-SARI
Research Station at Manga in the Upper East Region of Ghana. The aim of the
experiment was to study the response of roselle to cowdung, nitrogen fertilizer
and their interaction on the growth and yield of roselle. The treatments consisted of factorial combination of
five rates of cowdung (0, 1.5, 2.5, 3.5 and 4.5 t/ha) and five levels of
nitrogen (0, 20, 40, 60 and 80 kgN/ha) laid out in a randomized complete block
design and replicated three times. Data were collected on days to 50% flowering, plant height, number of leaves
per plant and dry calyx yield. The results indicated that differences in
dry calyx yield due to the manure and nitrogen fertilizer effects were highly
significant (P 0.01). Application rate of 2.5 t/ha manure recorded the highest yield of
340 kg/ha and 308.1 kg/ha in 2019 and 2020 respectively. Increasing manure rate
from 2.5 - 3.5 t/ha did not result in significant increases in dry calyx yield. The
four rates differed significantly from the control which had the least calyx
yield of 190.3 kg/ha and 180 kg/ha in 2019 and 2020 respectively. Nitrogen rate
of 60 kg/ha recorded the highest dry calyx yield of 510.5 kg/ha and 370.4 kg/ha
in 2019 and 2020 respectively which were
significantly different from calyx yields recorded by other treatments.
The trend on partial budget analysis was consistent in both seasons with the
highest yielding treatments (2.5 t/ha cowdung manure and 60 kg/ha) recording
the highest net benefit while the control (0 kg/ha) ranked last. The
application rate of 2.5 t/ha of cowdung and 60 kg/ha of Nitrogen is thus
recommended for optimum roselle production and productivity in the
study area.