Abstract:
Field experiments were conducted during 1998 and 19
99 rainy seasons at the Dry
Land Teaching and Research Farm of Usmanu Danfodiyo
University, Sokoto, to study the response
of roselle to farmyard manure, nitrogen and their i
nteraction on the growth and yield of roselle.
Treatment consisted of factorial combination of fou
r rates of farmyard manure (0, 2.5, 5.0 and 7.5
t/ha) and four levels of nitrogen fertiliser (0, 25
, 50 and 75 kg N/ha) laid out in a randomized
complete block design replicated three times. The r
esult showed that there was significant response
to applied manure and N-fertiliser on number of lea
ves up to 5 t/ha manure and 50 kg N/ha. There
was no significant increase in calyx yield by raisi
ng manure rate from 2.5-7.5 /ha or nitrogen rate
from 50 to 75 kg N/ha. Thus, 2.5 t/ha manure and 50
kg N/ha were considered adequate for calyx
production in roselle in Sokoto Semi-arid Tropics.
However, for maximum number of vegetable
leaves additional manure (5-7.5 t/ha) and N fertili
zer (50-75 kg N/ha) may be necessary.
