RESPONSE OF COTTON GENOTYPES TO DIFFERENT SOURCES OF ORGANIC MANURES UNDER ORGANIC PRODUCTION SYSTEM
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Date
2007-10-01
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University of Agricultural Sciences GKVK, Banglore
Abstract
A field experiment was conducted to study the ^'Response of cotton genotypes to different
sources of organic manures under organic production system" at Main Agricultural Research
Station, University of Agricultural Sciences, Dharwad during 2004-05. The experiment was laid out
in split plot design with varieties as main plots and organic nutrient management treatments as sub
plots with three replications. Bio-pesticides were used as combative measures against pest and
diseases.
Among the varieties evaluated under organic production system, Jayadhar recorded
significantly higher (TDMP) (137.50 g/plant) and drymatter accumulation in leaves (17.66 g/plant),
stem (85.50 g/plant) and squares (4.82 g/plant) as compared to Sahana. Jayadhar also recorded
significantly higher LAI (0.54 dm/m^), number of monopodial and sympodial branches (5.10 and
14.75/plant) and number of bolls (36.38/plant) at 180 DAS as compared to Sahana. Kapas yield
(1 172 kg/ha), net return (Rs,10,992/-) and B:C ratio (2:2) were also significantly higher with
Jayadhar. Sahana recorded significantly higher fibre length, fibre fineness, fibre strength and
maturity ratio as compared to Jayadhar.
Among manorial treatments, integrated application of RDF (40:25:25 N, P2O5, K2O kg/ha)
with FYM 7.5 t/ha recorded significantly higher TDMP production (142.16 g/plant), plant height
(108.33 cm), leaf weight (18.74.g/plant), stem weight (83.54 g/plant), boll weight (39.10), number of
monopodial and sympodial branches (4.33 and 15.56/plant) and number of green bolls (30.05/plant)
at 180 DAS as compared to rest of the treatment. Seed cotton yield (1142.35 kg/ha) was also higher
with integrated manurial treatment. However, there was no significant difference with respect to
quality parameter among all the treatments.
Organic manurial treatments, FYM and VC equivalent to 100% RDN, FYM 100% + VC
100%, FYM 100% + glyricidia 100%, FYM 100%+ VC 50% + neem cake 50%, FYM 100% +
glyricidia 50% + neem cake 50%, FYM 50%+ glyricidia 50%, FYM 50%+ VC 25%+ neem cake
25% and FYM 50%+ glyricidia 25%+ neem cake 25% were found on par with that of RDF
(40:25:25 N, P2O5, K2O kg/ha).
Integrated manurial treatment (RDF+FYM) recorded significantly higher N, P2O5 and K2O
content after harvest of the crop (264.27, 34.22 and 480.97 kg/ha NPK). Organic carbon content In
soil was higher with RDF + FYM and FYM 100% + glyricidia 100% and also recorded significantly
higher population of bacterial, fungal and actinomycetes.
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