Performance of Bt. Cotton under different spacings and nutrient levels
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Date
2011
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Abstract
A study entitled, “Performance of Bt. Cotton under different spacings and nutrient levels ”,
was conducted at Research Farm, Department of Agronomy, CCS Haryana Agricultural University,
Hisar during Kharif 2010. The soil of experimental field was sandy loam in texture and slightly high in
pH. Soil tested low in organic carbon and available nitrogen and medium in available phosphorus and
high in potassium. The experiment was conducted in split plot design with three replications. The
combination of three spacings (100x40 cm, 100 x 50 cm and 100 x 60 cm),two time of N fertilizer
application viz., T1 :50 per cent at flowering and 50 per cent at square formation, T2: 25 per cent as
basal, 37.5 per cent at flowering and 37.5 per cent at square formation, were kept in main plots while
three nutrient levels viz., F1 131.2: 45: 45 NPK (Kg/ha), F2 175.0:60:60 NPK (Kg/ha), F3 218.7: 75:
75 NPK (Kg/ha), were kept in subplots. Maximum plant height was recorded at closer spacing of 100x
40 cm. Maximum sympods per plant were recorded in wider spacing (100 x 60 cm) which were
significantly higher than closer spacing (100 x 40 cm and 100 x50 cm). Seed cotton yield (Kg/ha) was
highest in closer spacing (100 x 40 cm). Maximum oil content (%) and protein content (%) was
recorded in cotton seed in wider spacing (100 x 60 cm) which were significantly higher than closer
spacings (100 x 40 cm and 100 x50 cm). Available N, P and K in soil after harvesting of crop were
significantly differs with respect to plant spacing, time of N application and nutrient levels. Spacing 100
x 40 cm and 100 x 50 cm resulted in higher total cost of cultivation, gross returns and net returns than
100 x 60 cm with 100 per cent and 125 per cent of recommended dose of fertilizers Benefit: cost ratio
was significantly better in spacing 100 x 40 cm and 100 x 50 cm with 100 per cent and 125 per cent of
recommended dose of fertilizers with three split doses of N fertilizer.
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Keywords
cotton, spacing, planting, yields, fertilizers, sowing, nutrients, fertilizer application, developmental stages, crops