Summary
The proportion of nitrogen obtained by wheat Pak-70 from N15 labelled urea applied at the rate of 120 kg N/ha was less than 35%. Leaching of nitrogen beyond the root zone was shown to be negligible. Most of the nitrogen was therefore left in the soil as residue. The increase in soil inorganic nitrogen values after the wheat harvest confirmed the presence of residual nitrogen.
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Acknowledgment. This work was sponsored jointly by the International Atomic Energy Agency and the Pakistan Atomic Energy Commission under Research Contract No. 1673/GS. The authors are grateful to the IAEA for providing some essential equipment and analyses of wheat samples for N15.
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Iqbal, M.M., Hussain, S.K. & Siddiqi, S.H. Fertilizer residue from labelled urea in a clay soil. Experientia 37, 974–975 (1981). https://doi.org/10.1007/BF01971787
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DOI: https://doi.org/10.1007/BF01971787