PHOSPHORUS MANAGEMENT IN GROUNDNUT (Arachis hypogaea L.) USING SLUDGE IN VERTISOLS OF NORTHERN TRANSITIONAL TRACT OF KARNATAKA
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Date
2001-08-02
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
A field experiment was conducted on black soils at Main Research
Station, University of Agriculture Sciences, Dharwad, during kharif
1999-2000 to study the effect of phosphorus management practices iii
groundnut using sludge. The treatments consisted of two sources of
phosphorus (sludge and SSP), FYM and phosphorus solubilizer
(Pseudomonas stnata). The experiment was laid out in randomised block
design with three replications.
The pod yield of groundnut differed significantly with different
treatments. The maximum pod yield (45.9 q/ha) was recorded in
treatment that received 50% phosphorus through sludge plus 50%
phosphorus through SSP along with FYM and phosphorus solubilizer and
was on par with 100% phosphorus through SSP alone.
The kernel yield and oil yield per ha also differed significantly by
different treatments. The highest kernel yield (33.33 q/ha) and oil yield
(15.33 q/ha) were obtained in treatment receiving 50% phosphorus
through sludge plus 50% phosphorus through SSP along with FYM and
phosphorus solubilizer.
The values of growth components (Plant height, number of
branches per plant, leaf area per plant, LAI and dry matter production
and its distribution in different parts) and yield components (number of
pods per plant, pod weight per plant and 100 pod weight) were also
higher with the application of sludge and SSP in the ratio of 1:1 and 3:1
along with FYM and phosphorus solubilizer.
Maximum net income (Rs. 46,012/ha) was realised in treatment
receiving sludge and SSP in the ratio of 1:1 along with FYM and
phosphorus solubilizer. Higher B:C ratio was recorded in treatment
which received sludge and SSP in the ratio of 3:1 along with phosphorus
solubilizer.
Significantly lower fluoride content in groundnut kernel (3.02 ppm)
was found in control treatment which received 100% SSP alone compared
to other treatments.
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