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The fate of applied N in soil and its relative uptake by black pepper vine and erythrina tree on which the vine was trailed, were determined using 15N-labelled urea. Rapid depletion of 15N from 0-50 cm root zone was noticed due to heavy leaching during rains. The isotope content of the soil fell below the detection limit within one month of urea application. Both the vine and support tree absorbed...
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