EFFECT OF SOURCES AND LEVELS OF SULPHUR ON SUNFLOWER
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Date
2001
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Mahatma Phule Krishi Vidyapeeth, Rahuri.
Abstract
A field experiment was conducted during kharif 2000-2001
at PGI farm, M.P.K.V., Rahuri, Dist. Ahmednagar. The experiment
was laid out in Factorial Randomised Block Design, with three
replications. There were sixteen treatments viz., four sources of sulphur and four levels of sulphur (0, 20, 30 and 40 kg S ha1). The
nitrogen, phosphorus and potassium was applied as a basal dose as
per the yield targeting equation to sunflower crop. Various forms of
sulphur were estimated initially and after harvest of the crop. An
incubation study was also carried out in the laboratory at ambient
conditions.
The results revealed that the gypsum application was
beneficial for soil available sulphur whereas, the sulfer-95
application increased the non-sulphate sulphur in soil. Highest level (40 kg S ha1) significantly increased the total sulphur, organic
sulphur and available sulphur.
Oxidation behaviour of sulphur was studied by
incubating different sources of sulphur at different levels in soil at
field capacity for 60 days. The results showed that elemental sulphur
application viz., elemental sulphur and sulfer-95 showed slower rate
of sulphur oxidation than gypsum and single super phosphate.
Sunflower crop showed spectacular response to application
of sulphur. Higher levels of sulphur application were beneficial for
enhancing the concentration of nitrogen, phosphorus and sulphur in
sunflower. The application of single super phosphate or gypsum were
equally important for uptake of nitrogen, phosphorus, potassium and
sulphur by sunflower crop. The gypsum source of sulphur application
was significantly beneficial for oil per cent of sunflower. The oil content of sunflower was increased with sulphur application @ 30 kg ha1 or 40 j kg ha1.
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