EFFECTS OF NITROGEN, SOWING DATE, POPULATION AND VARIETY ON GROWTH, YIELD COMPONENTS AND YIELD OF OKRA (Abelmoschus esculentus (L.) Moench).
EFFECTS OF NITROGEN, SOWING DATE, POPULATION AND VARIETY ON GROWTH, YIELD COMPONENTS AND YIELD OF OKRA (Abelmoschus esculentus (L.) Moench).
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Date
2000-01
Authors
MOSES, ASHOLA AMADU
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Abstract
The responses of two okra (Abelmoschus esculentus (L.) Moench) varieties (Local-1
and V-35) sown at two sowing dates (early and late, depending on establishment of rains)
with 3 levels each of nitrogen, (0, 45, and 90kgN/ha) and 3 populations (22,000, 44,000
and 88,000 plants/ha) were investigated during 1992 to 1994 rainy seasons. The
experiments were conducted in a split plot design, replicated 3 times at the Institute for
Agricultural Research Farm, Samaru. The main plot treatments were factorial
combinations of nitrogen and sowing date, while sub-plot treatments consisted of a
combinations of 3 populations and two varieties (variety Local-1 and variety v-35). Date
of sowing and nitrogen were found to influence the growth parameters. An increase in
nitrogen levels increased the growth parameters including number of leaves, fresh weights
of stem and roots, leaf area, leaf area index, and plant height. It also increased yield
components and yield in all experiments. Populations and varieties were not consistent in
their effects during the period of study. A delay in sowing reduced most of the growth
parameters as well as yield components and yield. Correlation coefficient of growth
parameters and yield components were found to be consistently close and positively
correlated with the yield. Among factors studied, date of sowing is the most crucial factor
affecting both vegetative characters and yield components, followed by nitrogen,
population and variety. The adapted Local-1 cultivar, with a population of 22,000
plants/ha and at 90kgN/ha is optimum for production under Samaru conditions.
Description
A THESIS SUBMITTED TO THE POST-GRADUATE SCHOOL OF AHMADU
BELLO UNIVERSITY, IN PARTIAL FULFILMENT OF THE REQUIREMENT
FOR THE DEGREE OF DOCTOR OF PHILOSOPHY IN AGRONOMY
DEPARTMENT OF AGRONOMY
FACULTY OF AGRICULTURE
AHMADU BELLO UNIVERSITY
ZARIA, NIGERIA
JANUARY, 2000
Keywords
EFFECTS,, NITROGEN,, SOWING DATE, POPULATION,, VARIETY,, GROWTH,, YIELD COMPONENTS,, YIELD,, OKRA (Abelmoschus esculentus (L.) Moench.