&lt;p&gt;Field experiment was conducted to fine tune the nutrient management techniques for yield improvement of rice fallow blackgram.&lt;/p&gt;

&lt;p&gt;Three fertilizer application practices to the preceeding rice crop and basal application of fertilizer to blackgram of N and P @ 12.5:25 kg ha &amp;ndash;1 (prior to harvest of rice crop) formed the main plot treatments and five foliar nutrient sprays constituted the subplot treatments.&lt;/p&gt;

&lt;p&gt;In general, all the growth and yield parameters and yield were significantly influenced when foliar spray of 2% DAP + 1% KCI was given at flowering and pod filling stages of crop growth. Interaction between fertilizer application and foliar spray was significant for DMP, yield parameters, grain and haulm yields.&lt;/p&gt;

&lt;p&gt;Basal application of N and P fertilizer @ 12.5:25 kg ha &amp;ndash;1 along with foliar spray of 2% DAP +1% KCI twice at flowering and pod filling stages of crop growth recorded higher gross returns, net returns and benefit cost ratio.&lt;/p&gt;

&lt;p&gt;In nut shell, considering the overall performance of the crop in terms of yield and economics the study has clearly indicated that basal application of N and P fertilizer along with the foliar spray of 2% DAP +1% KCI twice at flowering and pod fillings stages of crop growth would be an ideal nutrient management technique for rice fallow blackgram.&lt;/p&gt;
