Irrigation and nitrogen source management for improving NUE in intensive Mediterranean horticulture

  • J. S. Rubio-Asensio /
  • J. M. Ramírez-Cuesta /
  • J. M. Mirás-Avalos /
  • J. F. Maestre-Valero /
  • I. Buesa /
  • D. S. Intrigliolo
Book Series ar
Acta Horticulturae
  • Volumen: 1253
  • Fecha: 01 enero 2019
  • Páginas: 335-342
  • ISSN: 24066168 05677572
  • Tipo de fuente: Serie de libros
  • DOI: 10.17660/ActaHortic.2019.1253.44
  • Tipo de documento: Artículo
  • Editorial: International Society for Horticultural
© 2019 International Society for Horticultural Science. All rights reserved.This study evaluates two strategies aimed to increase NUE in intensive Mediterranean horticulture: i) the precise adjustment of crop irrigation requirements to cover the losses by transpiration and evaporation from the soil, and ii) replacement of N source, from the highly leachable nitrate to ammonium, which is also directly used by the plant, and retained in the clay-humus complex. Two field experiments, with endive and muskmelon, were carried out in order to compare three treatments; i) irrigation and N management according to the farmer's criterion (F), ii) precision irrigation management with N according to the farmer's criterion (RA), and iii) precision irrigation management switching nitrate (N-NO3-), which is the fertiliser the farmer uses preferably, for ammonium (N-NH4+) [RA (Am)]. Plant water and nitrogen consumption, biomass production and yield, mineral tissue concentration, and nitrate and ammonium concentrations at 25-30 cm depth of soil were measured. The results indicate that precision irrigation alone or in combination with nitrogen source management can be used as a strategy to increase NUE, as long as the crop tolerance to ammonium is taken into account.

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