RESPONSES OF COTTON (Gossypium hirsutum L.) TO SUPPLEMENTARY IRRIGATION AND NITROGEN FERTILIZER RATES
RESPONSES OF COTTON (Gossypium hirsutum L.) TO SUPPLEMENTARY IRRIGATION AND NITROGEN FERTILIZER RATES
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Date
1989-10
Authors
JIKA, MUHAMMED
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Abstract
Investigations to evaluate the response of cotton
to supplementary irrigation at various stages of growth
under different levels of nitrogen were carried out in
1987 at Kadawa Irrigation Research Station, Kano (lat. 11°30'N,
Long. 8°30'E).
Supplementary irrigation was given as follows:
Pre-sowing irrigation, pre-sowing plus pre-flowering, presowing
plus post-flowering and pre-sowing plus pre-flowering
plus post-flowering irrigations each at nitrogen levels of
0, 40 and 80 kg/ha.
Growth characters, yield components and yield of cotton
were all statistically similar in the irrigated crop but
significantly higher than the control. Only one pre-sowing
irrigation produced the highest! seed-cotton yield (3,770kg/ha)
that was 5 4% more than the control. Further increase in
irrigation levels resulted in reduction of seed cotton yield.
Nitrogen application positively increased vegetative
characters, yield components and seed-cotton yield. Application
of 40 kg N/ha yielded 3,189 kg seed-cotton per hectare
which was 16% higher than the control. There was no significant
yield advantage by increasing nitrogen level from 40 to 80kg/ha
Description
A Thesis submitted to the Post-graduate School
Ahmadu Bello University, Zaria
In partial fulfillment of the requirement for the
Degree of Master of Science in Agronomy
DEPARTMENT OF AGRONOMY
FACULTY OF AGRICULTURE
AHMADU BELLO UNIVERSITY
ZARIA - NIGERIA
OCTOBER - 1989
Keywords
RESPONSES,, COTTON,, (Gossypium hirsutum L.), SUPPLEMENTARY,, IRRIGATION,, NITROGEN,, FERTILIZER,, RATES.