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
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Creator |
KRISHNAVENI PAGATI
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Contributor |
PULLA RAO, Ch
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Subject |
Planting, density, effects, productivity, Bt cotton
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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. |
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Date |
2016-08-02T10:52:24Z
2016-08-02T10:52:24Z 2008 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/70475
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Language |
en
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Relation |
D8381;
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Format |
application/pdf
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Publisher |
ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD
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