Patra, A K and Rego, T J (1996) Movement of bromide as a tracer for nitrate in an Alfisol of the Indian Semi-Arid Tropics under rainfed condition. Fertilizer Research, 45 (2). pp. 111-116. ISSN 0167-1731
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Abstract
The variable responses of crops to added nitrogen (N) in Alfisols of the Indian semi-arid tropics are partly due to variable rainfall and partly due to variable losses of available-N. To measure the losses of N through leaching, which can be appreciable under some circumstances, a field experiment was conducted during the rainy season (June-September) of 1992, using bromide (Br) as a tracer for NO 3 - . Bromide (as NaBr) was applied to bare fallow soil at a rate of 200 kg ha−1 in microplots (2 m × 2 m) and its vertical movement was monitored periodically. Data on rainfall and Br− distribution in the soil profile on different dates of soil sampling clearly indicated that the movement of Br− was strongly dependent on rainfall. During the first month (15 June-15 July) after Br− application, with scattered and light rainfall about 90% of the added Br− remained in the soil profile (0.6 m). After continuous heavy rainfall in early August more than 90% Br− had moved beyond 0.6 m depth. This indicates a very high risk of NO 3 - leaching in this soil, and it is unavoidable without special measures to protect the applied N
| Item Type: | Article |
|---|---|
| Divisions: | UNSPECIFIED |
| CRP: | UNSPECIFIED |
| Uncontrolled Keywords: | Semi-arid tropics, Alfisol, nitrate, bromide, leaching |
| Subjects: | Others > Soil Science |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 10 Jan 2013 06:28 |
| Last Modified: | 07 Feb 2014 06:19 |
| URI: | http://oar.icrisat.org/id/eprint/6396 |
| Official URL: | http://dx.doi.org/10.1007/BF00790660 |
| Projects: | UNSPECIFIED |
| Funders: | UNSPECIFIED |
| Acknowledgement: | UNSPECIFIED |
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