| dc.description.abstract | Effect of Farmyard manure, nitrogen and phosphorus
on growth and yield of two upland cotton varieties
(UKA 59/240 and BPA 75) was investigated at Tebere
during the October, 1982 and March, 1983 cropping
seasons. Varying levels of farmyard manure, nitrogen
and phosphorus were tested in factorial combination.
Mean seedcotton yields in the two seasons, i.e.
October, 1982 to August, 1983 and March, 1983 to
December, 1983 were 1806 and 1164 kg ha ,
respectively. The yields were lower than the
expected mean yields of 2,000 kg ha for Tebere.
During the October 1982 crop season trial,
BPA 75 attained a height 3.0 em taller, 0.4
fruiting bodies per plant more and 55 kg ha more
seedeotton than UKA 59/240 in the first flowering
season.
In the second flowering season however, the
reverse was true and UKA 59/240 performed better
than BPA 75 by attaining 4.7 em, 4.1, 1.6 and 199
kg had in plant height, fruiting bodies per plant,
bolls per plant and seed-cotton yields respectiycly
over nPA 75.
The reversal in performance of the bvo varieties
could be attributed to varietal characteristics and
moisture stress. BPA 75 is earlier 'maturing, more
determinate in gr-owt-h and more sensitice to moisture
stress than UKA 59/240. In the first flowering season
BPA 75 therefore performed better than UKA 59/240
by virtue of its plant characteristics. However, in.
the second flowering season following severe midseason
moisture stress, it could not regenerate
vegetative growth as fast as UKA 59/240, therefore its
performance was worse ,
Farmyard manure increased plant height by 5.9 cm
and bottom crop seedcotton yield by 90 kg had over
the control (115.7 cm and 795 kg ha -I) respectively
in the season. Nitrogen increased plant height,
fruiting bodies per plant, bolls per plant, bottom
crop, and total seedcotton yield, respectively by
1405 cm, 3.5, 1.8, 143 kg ha and 254 kg had.Apart
from increasing plant height by 3.5 cm at the end
of the mid-season drought, phosphorus has no effect
on the crop in the October 1982 crop season.
During the March 1983 crop season trial, no
significant (P=O.OS) differences were observed among
treatments for most part of the growing season, due
most probably to very 10\'1rainfall. At flowering
in September and in October, treatment effects
became significant (P=O.05) as rainfall increased.
Over this period up to harvesting in December,
UKA 59/240 performed better in plant height
(3.9 cm) and fruiting (1.8 fruiting bodies per plant)
than BPA 75 which attained 109.5 cm in plant height
and produced an average of 12.0 bolls per plant.
Farmyard manure and nitrogen had no effect on
fruiting and boll production, but increased plant
height (5.3 and 5.4 cm respectively) and seedcotton
yield (125 and 127 kg ha respectively) in the
season.
There was an interaction between variety and
manure so that response to manure was higher in
BPA 75 than in UKA 59/240. Seedcotton yield was
negatively affected by PXN interaction. Correlations
of soil nitrogen and phosphorus with foliar nitrogen
and phosphorus respectively and correlations of foliar
nitrogen and phosphorus, boll size and branches per
plant ,with seedcotton yield were not significant,
However, plant height and bolls per plant were
significantly correlated with seedcotton yield. | en |
