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Endotoxin Expression as Influenced by Nutrient Levels and Nitrogen Split Application and Refuge Crop Management in Bt Cotton Under Irrigation

KrishiKosh

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Title Endotoxin Expression as Influenced by Nutrient Levels and Nitrogen Split Application and Refuge Crop Management in Bt Cotton Under Irrigation
 
Creator Basavanneppa M.A.
 
Contributor V.V. Angadi
 
Subject Agronomy
 
Description Among two field experiments conducted at Agricultural Research Station, Siruguppa
during 2007-08 and 2008-09, the experiment entitled ?d-endotoxin expression as influenced
by nutrient levels and N split application on Bt cotton (Gossypium hirsutum L.) genotypes
under irrigation? was laid out in split-split plot design with V1: MECH-162 Bt, V2: RCH-2
Bt, V3: JK-Durga Bt (BG-I) and V4: MRC-7201 (BG-II) genotypes as main plots, nutrient
levels F1: 120:60:60 (Recommended), F2:160:80:80 and F3: 200:100:100 (Farmers? practice)
N:P2O5:K2O kg ha-1 as sub plots and nitrogen split application A: 50% N as basal + 50% N in
three equal splits at 50, 80 and 110 DAS + foliar spray of urea @ 2% at 80 and 100 DAS and
B: 12.5% N as basal and at 30, 90 and 120 DAS and 50% N at 60 DAS with foliar spray of
urea @ 2% at 105 and 135 DAS as sub-sub plots. Second experiment on ?Standardization of
refuge crops/cropping systems in Bt cotton under irrigation? was laid out in RCBD with T1:
100 % Bt cotton , T2: Bt cotton (80%) + Non Bt cotton (20% as border crop), T3: Bt cotton +
Non Bt cotton (8:2 row proportion), T4: Bt cotton + okra-chickpea (8:2 row proportion), T5:
Bt cotton + pigeonpea (8:2 row proportion), T6: Bt cotton + maize (One week advance
sowing) ? chickpea (8:2 row proportion) and T7: Bt cotton + maize ? chickpea (8:2 row
proportion).
Significantly higher seed cotton yield was recorded with MECH-162 Bt (2537 kg ha-
1) followed by RCH-2Bt. Application of 200:100:100 N:P2O5:K2O kg ha-1 recorded higher
seed cotton yield (2515 kg ha-1) compared to other nutrient levels. Split application of 12.5%
N as basal and at 30, 90 and 120 DAS and 50% N at 60 DAS with foliar spray of urea @ 2%
at 105 and 135 DAS produced significantly higher seed cotton yield (2397 kg ha-1). V1F3B
recorded significantly higher yield (2736 kg ha-1), gross return (Rs. 76600 ha-1), net return
(Rs. 52690 ha-1) and B: C ratio (3.21). Higher d-endotoxin concentration (2.67 ?g g-1) was
observed with V3F3B at 45 DAS.
Seeding with 100% Bt cotton (T1) recorded significantly superior seed cotton yield
(1942 kg ha-1) compared to other treatments. Whereas, Bt cotton + okra-chickpea (8:2 row
proportion) recorded highest Bt cotton equivalent yield (2446 kg ha-1), gross return (Rs
68481 ha-1), net return (46585 ha-1) and B: C ratio (3.13), which were on par with those of
100% Bt cotton.
 
Date 2016-07-26T09:38:36Z
2016-07-26T09:38:36Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/69824
 
Format application/pdf
 
Publisher UAS Dharwad