Impact of nitrogen uptake on field water balance in fertirrigated melon.

Tarquis Alfonso, Ana Maria ORCID: https://orcid.org/0000-0003-2336-5371, Castellanos Serrano, Maria Teresa, Cartagena Causape, Maria Carmen ORCID: https://orcid.org/0000-0003-3921-4674, Ribas Elcorobarrutia, Francisco, Cabello Cabello, María Jesús and Arce Martinez, Augusto ORCID: https://orcid.org/0000-0001-9522-5680 (2012). Impact of nitrogen uptake on field water balance in fertirrigated melon.. "Agricultural Water Management", v. 120 (n. null); pp. 56-63. ISSN 0378-3774. https://doi.org/10.1016/j.agwat.2012.10.020.

Description

Title: Impact of nitrogen uptake on field water balance in fertirrigated melon.
Author/s:
Item Type: Article
Título de Revista/Publicación: Agricultural Water Management
Date: 31 March 2012
ISSN: 0378-3774
Volume: 120
Subjects:
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Matemática Aplicada a la Ingeniería Agronómica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Agronomic management in Ciudad Real, a province in central Spain, is characteristic of semi-arid cropped areas whose water supplies have high nitrate (NO3?) content due to environmental degradation. This situation is aggravated by the existence of a restrictive subsurface layer of ?caliche? or hardpan at a depth of 0.60 m. Under these circumstances, fertirrigation rates, including nitrogen (N) fertilizer schedules, must be carefully calibrated to optimize melon yields while minimizing the N pollution and water supply. Such optimization was sought by fertilizing with different doses of N and irrigating at 100% of the ETc (crop evapotranspiration), adjusted for this crop and area. The N content in the four fertilizer doses used was: 0, 55, 82 and 109 kg N ha?1. Due to the NO3? content in the irrigation water, however, the actual N content was 30 kg ha?1 higher in all four treatments repeated in two different years. The results showed correlation between melon plant N uptake and drainage (Dr), which in turn affects the amount of N leached, as well as correlation between Dr and LAI (leaf area index) for each treatment. A fertilizer factor (?) was estimated through two methods, from difference in Dr and in LAI ratio with respect to the maximum N dose, to correct ETc based on N doses. The difference was found in the adjusted evapotranspiration in both years using the corresponding ? achieved 42?49 mm at vegetative period, depending on the method, and it was not significant at senescent period. Finally, a growth curve between N uptake and plant dry weight (DW) for each treatment was defined to confirm that the observed higher plant vigour, showing higher LAI and reduced Dr, was due mainly to higher N doses.

More information

Item ID: 15453
DC Identifier: https://oa.upm.es/15453/
OAI Identifier: oai:oa.upm.es:15453
DOI: 10.1016/j.agwat.2012.10.020
Official URL: http://www.sciencedirect.com/science/article/pii/S...
Deposited by: Memoria Investigacion
Deposited on: 31 May 2013 17:59
Last Modified: 21 Apr 2016 15:30
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