Abstract
The use of ZnSO4 and FeSO4 either alone or in combination with wood vinegar is incubated to 60 days and it was compared in the present investigation with an aim to increase the nutrient release pattern of micronutrients viz, Fe and Zn under sodic soil conditions. An incubation experiment was conducted during 2019 in ADAC & RI, Trichy, Tamil Nadu. The incubation experiment comprised of 12 treatments replicated twice in a completely randomized design. The treatments included recommended dose of FeSO4 and ZnSO4 alone and their combination and their combination with three levels of wood vinegar viz., 50, 100 and 150 ml/l applied as as spot drenching (SD). Incubated soil sample were analysed for DTPA Zn and Fe at different intervals (0, 15, 30 45 and 60 DAI). The results of the investigation revealed significant differences in wood vinegar release of DTPA Zn and Fe among the treatments in comparison with the ZnSO4 and FeSO4 either alone or in combination of ZnSO4 and FeSO4. Among the treatments, During 0th day of incubation (DAI), the treatment T12 receiving the recommended dose of both ZnSO4 and FeSO4 along with wood vinegar (WV) @ 150 ml/l as spot drenching recorded significantly higher value of available Zn content (46.68 mg kg-1). The lowest value was recorded in the treatment T1 (6.72 mg kg-1) which received recommended dose of FeSO4 alone. At 0th day of incubation (DAI), the treatment receiving recommended dose of ZnSO4 alone (T2) recorded the lowest DTPA Fe (7.32mg kg-1) while the highest value(48.28 mg kg-1) was recorded in the treatment receiving recommended dose FeSO₄ @ 50 kg /ha along with WV @150 ml/l (T6). Therefore, incorporation of wood vinegar increased the effectiveness of Fe and Zn in sodic soils. The release of DTPA Zn and Fe attained peak at 15 DAI and declined thereafter up to 60 DAI. The experiment received that the DTPA Zn and Fe which contributes to available Zn and Fe considerably increased under wood vinegar drenching in sodic soil.
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