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Critical concentration (ppm) of Zn in case of DTPA extract is...

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Critical concentration (ppm) of Zn in case of DTPA extract is

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Correct Answer: Option A
The DTPA (Diethylene triamine pentaacetic acid) micronutrient extraction method is a non-equilibrium extraction for estimating the potential soil availability of Zinc, Copper, Manganese and Iron.
The critical concentration (ppm) of Zinc in the case of DTPA extract is 6.
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