The present study was undertaken to investigate the effect of phosphorus and different forms of nitrogen applied to soil on nitrogen mineralisation and yield of ragi under pot culture conditions. Mineralisation of organic nitrogen in soil has been fully reviewed by Harmsen and Van Schreven in 1955. Subsequently, many workers have described the effect of moisture content, temperature, pH and aeration during incubation on mineralisable nitrogen. But few attempts have been made to correlate the values obtained with responses of crops to nitrogen fertiliser application or forms of fertiliser applied and the influence of phosphorus and potash on nitrogen availability.
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