The micro nutrient availability is low in coastal saline soils due to high pH, salinity, poor texture, low organic matter, leaching etc. Crops grown in nutrient deficient soils lacks the nutrient needed to maintain human health. The foundation of human health is the quality of the soil on which it is raised. Hence, to study the effect of fortified organic manure on the nutrient availability and bio fortification of Fe and Zn in black gram under coastal saline condition, one field experiment was conducted in a farmer’s field near C. Arulmozhidevan village, Bhuvanagiri taluk during Jan-March, 2018. The initial experimental soil was saline and analysed a pH of 7.92, EC 2.03 dS m-1 and represents low NPK and micronutrient status. The following treatments namely, T1Control ( Recommended NPK), T2NPK + ZnSO4 @ 25 kg ha -1 + FeSO4 @25 kg ha -1, T3NPK + 100 % Zn and Fe fortified organic manure @ 5 t ha-1, T4NPK + 100 % Zn and Fe + bio active compounds fortified organic manure @ 5 t ha -1, T5NPK + 75 % Zn and Fe fortified organic manure @ 5 t ha -1, T6NPK + 75 % Zn and Fe + bio active compounds fortified organic manure @ 5 t ha-1, T7NPK + 50 % Zn and Fe fortified organic manure @ 5 t ha -1, T8NPK + 50 % Zn and Fe + bio active compounds fortified organic manure @ 5 t ha-1 were studied in RBD with three replications. Black gram variety ADT 3 was cultivated. The soil samples at flowering and harvesting stages were collected and analysed for various physico-chemical properties and nutrient availability. Plant sample at flowering and harvest and seed samples at harvest were collected and analysed for major and micro nutrient contents by preparing Di acid extract (H2SO4: HClO4, 5:1 ratio). The results of the study indicated the efficient role played by the treatment NPK + 75 % Zn and Fe + bio active compounds fortified organic manure @ 5 t ha-1 in improving the availability of the macro and micro nutrients under saline environment. This treatment also proved efficient in fortifying black gram by registering higher zinc content in seed (44.25ppm) and haulm (51.92 ppm) and Fe content in seed (65.23 ppm) and haulm (141.62 ppm).
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