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Neem (Azadirachta indica) oil coated urea improves nitrogen use efficiency and maize growth in an alkaline calcareous soil

Author
Mohsin Ali
Muhammad Aamer Maqsood
Tariq Aziz
Masood Iqbal Awan
Abstract/Summary

Two independent experiments were conducted to assess neem oil coated urea (NOCU), as a natural nitrification inhibitor and to improve nitrogen use efficiency in maize. In first experiment, soil incubation with increasing levels (i.e. 1%, 2% and 3% w/v) of neem oil coating was done for 28 days to monitor the release of NH4+ and NO3-contents. Neem oil coated urea slowed down the release of mineral N with maximum nitrification inhibition (40%) at 3% level of neem coating as compared to 2% and 1%, hence selected for next study. In the subsequent pot study, NOCU was applied according to recommended dose (250 kg ha-1) of urea at three different levels (50%, 75% and 100%) for maize crop. There was a significant increase in N contents of shoot and grains that ultimately provoked high protein contents in maize grains. Application of NOCU enhanced the N uptake due to its increased availability for longer period of time, resulting in higher grain yield. Maximum agronomic efficiency (24.38 g g-1) of applied N was observed with 75% dose of NOCU, while maximum recovery efficiency (0.44 g g-1) was recorded with 100% dose of NOCU. Conclusively, application of NOCU saves 25% N application compared to ordinary urea.

Year of publication
2020
Journal/Publisher
Pakistan Journal of Agricultural Sciences
DOI/URL
https://research-repository.uwa.edu.au/en/publications/neem-azadirachta-indica-…
Work Package
Research Package 2
English

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