Author(s):

P Vanitha, R Indirani, P Saravana Pandian and C Rajamanickam

Abstract: A laboratory incubation study was conducted in 2020 at Agricultural college and research institute, Madurai to assess the releasing pattern of Phosphorus in red soil (Typic Rhodustalfs) with the application of chemical fertilizers alone and along with organic inputs and bio inoculants (Phosphorus solubilising bacteria). An incubation experiment results revealed that increased application of phosphorus improves the available phosphorus in the soil. Different rates of application of chemical fertilizers (SSP) alone showed a tremendous increase in the available P up to seven weeks in the period of incubation and later it gets declined. The lowest mean status of available P (13.49 kg ha-1) was noted with the treatment (T2) receiving only chemical fertilizer. Whereas the phosphorus availability increased progressively with the increasing rate of application of 30days incubated chemical fertilizers (SSP) with FYM and PSB (phosphorus solubilising bacteria). A significant improvement in the available P was noticed in the treatment with combined application of 150 Kg P2O5 ha-1 incubated with 500 kg FYM (1:5) +PSB@ 2 Kg ha-1(T11) with the available P value ranges from 25.60 to 33.98 Kg P2O5 ha-1 with the mean value of 28.59 Kg P2O5 ha-1 in soil.

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