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Miras ávalos, José Manuel - Autor/a o coautor/a de capítulo de libro

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

Publicado en:Acta Horticulturae. 1253 335-342 - 2019-01-01 1253(), doi: 10.17660/ActaHortic.2019.1253.44

Miras ávalos, José Manuel;

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Resúmen: © 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.

Palabras clave: Ammonium; Endive; Leaching; Muskmelon; Nitrate; Water-use efficiency

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