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Nitrogen balance studies in rice using 15N-labelled urea and urea supergranules

Published online by Cambridge University Press:  27 March 2009

S. K. Mohanty ,
S. P. Chakravorti  and
A. Bhadrachalam
S. K. Mohanty
Affiliation:
Division of Soil Science and Microbiology, Central Rice Research Institute, Cuttack 753006, Orissa, India
S. P. Chakravorti
Affiliation:
Division of Soil Science and Microbiology, Central Rice Research Institute, Cuttack 753006, Orissa, India
A. Bhadrachalam
Affiliation:
Division of Soil Science and Microbiology, Central Rice Research Institute, Cuttack 753006, Orissa, India
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Extract

Recovery of applied nitrogen by the rice crop is invariably low, often 30–50% (Prasad & De Datta 1979). The poor recovery has been attributed to different types of losses occurring in the rice field. Recovery improved with split application, delayed application or deep placement (Pillai & Vamadevan 1978; Craswell & Vlek 1979), indicating that the management factor plays an important role in increasing fertilizer nitrogen efficiency. To investigate such factors, and seasonal effects, field experimentswere carried out using 15N-labelled urea (PU) and urea supergranules (USG). The recovery of fertilizer 15N by the plant and retention in the soil were studied in both dry and wet seasons.

Type
Short Note
Information
The Journal of Agricultural Science , Volume 113 , Issue 1 , August 1989 , pp. 119 - 121
Copyright
Copyright © Cambridge University Press 1989

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References

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