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RESPONSE OF
GOSSYPIUM HIRSUTUM GENOTYPES TO VARIOUS NITROGEN
LEVELS
ZARINA BIBI1*,
NAQIB ULLAH KHAN2, MARIA MUSSARAT3, MOHAMMAD JAMAL
KHAN3, RAFIQ AHMAD1,
IMDAD ULLAH KHAN1 AND SALMA SHAHEEN1
Abstract:
Response of six different upland cotton genotypes to various nitrogen
levels (0, 50, 100 and 150 kg N ha-1) was studied during crop
season 2010 at Khyber Pakhtunkhwa Agricultural University, Peshawar,
Pakistan. Highly significant differences in yield and yield parameters
were observed among cultivars, nitrogen levels and the interaction of
cultivars vs. nitrogen levels for the given parameters. Application of N
significantly increased plant height, sympodia per plant, bolls per
plant, boll weight and seed cotton yield but various cultivars responded
differently in term of percent increase over control. Maximum value of
the given parameter for the given cultivar was observed at higher N
level of 150 kg N ha-1. However, when percent increases in
the given parameter was considered, it was observed that those cultivars
having lower growth and yield traits at control responded more to N
application than those having initially higher growth traits which could
be due to genetic variation and efficient use of N. Overall, the
cultivar CIM-506 maintained higher plant height, sympodia per plant,
boll per plant, boll weight and seed cotton yield at all nitrogen levels
suggesting that it could be the promising cultivar under environmental
conditions of Peshawar and could be grown by supplying 150 kg ha-1
N. Since a linear increase in all growth parameters was observed up to
150 kg N ha-1 for all cultivars, studies with further higher
doses (levels beyond 150 kg ha-1)
are recommended for the confirmation of the findings of present study.
1Department of Soil and Environmental Sciences, Faculty of Agriculture,
Gomal University, Dera Ismail Khan, Pakistan
2Department of Plant Breeding and Genetics, Khyber Pakhtunkhwa
Agricultural University, Peshawar, Pakistan
3Department of Soil and Environmental Sciences, Khyber Pakhtunkhwa
Agricultural University, Peshawar, Pakistan
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