Mahmood, T. and Ali, R. and Malik, K.A. and Aslam, Z. and Ali, S. (2005) Seasonal pattern of denitrification under an irrigated wheat-maize cropping system fertilized with urea and farmyard manure in different combinations. Biology and Fertility of Soils , 42 (1). pp. 1-9.
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Abstract
Under semiarid subtropical field conditions, denitrification was measured from the arable soil layer of an irrigated wheat-maize cropping system fertilized with urea at 50 or 100 kg N ha-1 year-1 (U50 and U100, respectively), each applied in combination with 8 or 16 t ha-1 year-1 of farmyard manure (FYM) (F8 and F16, respectively). Denitrification was measured by acetylene inhibition/soil core incubation method, also taking into account the N2O entrapped in soil cores. Denitrification loss ranged from 3.7 to 5.7 kg N ha-1 during the growing season of wheat (150 days) and from 14.0 to 30.3 kg N ha-1 during the maize season (60 days). Most (up to 61%) of the loss occurred in a relatively short spell, after the presowing irrigation to maize, when the soil temperature was high and a considerable NO3--N had accumulated during the preceding 4-month fallow; during this irrigation cycle, the lowest denitrification rate was observed in the treatment receiving highest N input (U100+F16), mainly because of the lowest soil respiration rate. Data on soil respiration and denitrification potential revealed that by increasing the mineral N application rate, the organic matter decomposition was accelerated during the wheat-growing season, leaving a lower amount of available C during the following maize season. Denitrification was affected by soil moisture and by soil temperature, the influence of which was either direct, or indirect by controlling the NO3- availability and aerobic soil respiration. Results indicated a substantial denitrification loss from the irrigated wheat-maize cropping system under semiarid subtropical conditions, signifying the need of appropriate fertilizer management practices to reduce this loss.
| Item Type: | Article |
|---|---|
| Author Affiliation: | Nuclear Institute for Agriculture and Biology, P.O. Box 128, Jhang Road, Faisalabad, 38000, Pakistan |
| Subjects: | Soil Science and Microbiology > Soil Sciences Crop Improvement |
| Divisions: | Maize |
| Depositing User: | Mr B Krishnamurthy |
| Date Deposited: | 02 Dec 2010 21:47 |
| Last Modified: | 29 Dec 2010 20:04 |
| Official URL: | http://dx.doi.org/10.1007/s00374-005-0869-0 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/875 |
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