Evaluation of extractants for availability of soil iron, manganese, copper and zinc to lentil

Vinay Singh

Indian Journal of Pulses Research 15(2): 166-168


Accession: 004151193

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In a pot experiment, four chemical extractants were evaluated using (Lens culinaris) as a test crop on 20 surface soils (0-15 cm) from the alluvium region of Uttar Pradesh, India. The extraction capacities of these extractants varied widely, highest being 0.1 N HCI and lowest DTPA-CaCl2. Among the three best extractants, DTPA-CaCl2 showed better correlation with yield and uptake of these micronutrient cations. The critical limits of DTPA Fe, Mn, Cu and Zn in soil were 5.5, 3.2, 0.31 and 0.56 mg/kg, respectively. The critical Fe, Mn, Cu and Zn concentration in lentil plants were 76.7, 37.0, 5.1 and 12.0 mg-1 kg, respectively.