Losses of nitrate from a sandy loam soil under corn: lysimeter experiment
Losses of nitrate from an undisturbed sandy loam soil contained in two monolith lysimeters, Lo and L¡, (1 m diameter, 1.5 m deep) under com and irrigation (628 mm) were studied. The crop was fertilized with O (Lo) and 800 (L¡) kg N ha-l. Water draining was collected periodically and analysed for nit...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 1993 |
| País: | España |
| Institución: | Universidad de Sevilla (US) |
| Repositorio: | idUS. Depósito de Investigación de la Universidad de Sevilla |
| OAI Identifier: | oai:idus.us.es:11441/22935 |
| Acceso en línea: | http://digital.csic.es/bitstream/10261/60156/4/Losses%20of%20nitrate.pdf http://hdl.handle.net/11441/22935 |
| Access Level: | acceso abierto |
| Sumario: | Losses of nitrate from an undisturbed sandy loam soil contained in two monolith lysimeters, Lo and L¡, (1 m diameter, 1.5 m deep) under com and irrigation (628 mm) were studied. The crop was fertilized with O (Lo) and 800 (L¡) kg N ha-l. Water draining was collected periodically and analysed for nitrate content during the experimental period (20 March 91-23 March 92). Mean values of nitrate concentration in the drainage water were 3.1 and 41.2 mg NOrN 1-1 in Lo and Ll respectively, the latter much higher than the limit imposed by the EC for potable water (11.3 mg N l-I). Three periods were distinguished during the experiment: i) Crop season, in which the total volume of water drained was 310 and 47 mm respectively in the Lo and Ll, while the nitrate 10sses were of the same order in both lysimeters ( 21 and 17 kg N ha- l, respectively); ii) Dry season, in which there was no water drainage; and iii) Rainy season, in which the total drained water was 157 and 139 mm, and the nitrate los ses 5 and 91 kg N ha- l in Lo and L¡ respectively. The greater amount of water drained in Lo is due to the lower crop development (grain yield 4.4 and 21.3 t ha- l; total nitro gen plant uptake 69 and 400 kg N ha- l, in Lo and Ll respectively). Total nitrate losses in Ll account for 13% of the nitro gen fertilizer applied. Most of these losses occur in the rainy season. At the end of the experimental period a decrease of the soil nitrate content was observed in both lysimeters. |
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