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Planting density effects on productivity of Bt cotton (Gossypium hirsutum L.) hybrids

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Title Planting density effects on productivity of Bt cotton (Gossypium hirsutum L.) hybrids
 
Creator KRISHNAVENI PAGATI
 
Contributor PULLA RAO, Ch
 
Subject Planting, density, effects, productivity, Bt cotton
 
Description A field experiment was conducted on clay loam soil of the
Agricultural College Farm, Bapatla to study the effect of planting density
on productivity of Bt cotton (Gossypium hirsutum L.) hybrids during kharif
2006-07. The experiment was laid out in randomized block design with
factorial concept and replicated thrice. The treatments consisted of four
cotton hybrids (RCH-20 Bt, Mallika Bt, Bunny Bt and Bunny non-Bt) and
four planting densities (13,889, 18,518, 27,778 and 37,037 plants/ha).
The results indicated that the interaction effect of cotton hybrids and
plant densities was not significant in respect of all the characters studied
throughout the crop growth. All the cotton hybrids did not show significant
differences at 30, 60, 90, 120 DAS and harvest with respect to plant
height but incase of dry matter production per plant, cotton hybrids
produced significant differences at 90, 120 DAS and harvest only.
Significantly less number of days to attain 50% square formation and
flowering were recorded with hybrid Bunny Bt over remaining hybrids. Bt
cotton hybrids (RCH-20 Bt, Mallika Bt and Bunny Bt) recorded significantly
less number of bolls dropped and higher seed cotton yield per plant over
Bunny non-Bt hybrid. Significantly the maximum number of picked bolls
per plant was recorded with Mallika Bt over remaining hybrids. Almost
similar trend of response was noticed in respect of boll weight. Mallika Bt
and Bunny Bt hybrids recorded significantly higher seed cotton yield/ha
over RCH-20 Bt and Bunny non-Bt.
Higher plant density of 37,037 plants/ha produced significantly taller
plants throughout the crop growth period. Dry matter production, number
of sympodial branches, number of picked bolls and seed cotton yield per
plant and boll weight were significantly higher with the lowest plant density
of 13,889 plants/ha.
Significantly less number of days to attain 50% square formation,
flowering and higher seed cotton yield/ha were recorded with higher plant
density of 37,037 plants/ha.
The gross returns, net returns and benefit cost ratio were influenced
due to cotton hybrids and planting densities. The highest plant density of
37,037 plants/ha recorded the highest gross returns, net returns and
benefit cost ratio. Among hybrids, Mallika Bt produced higher gross
returns, net returns and benefit cost ratio.
From the present investigation, it is concluded that cultivation of
Mallika Bt hybrid with high plant density of 37,037 plants/ha gave higher
seed cotton yield and monetary returns than the other hybrids evaluated.
 
Date 2016-08-02T10:52:24Z
2016-08-02T10:52:24Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/70475
 
Language en
 
Relation D8381;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD