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dc.contributor.authorIsla Climente, Ramón
dc.contributor.authorSalmerón, Montserrat
dc.contributor.authorCavero Campo, José
dc.contributor.authorYagüe Carrasco, María Rosa
dc.contributor.authorQuílez, Dolores
dc.description.abstractCalibration of decision tools to improve N fertilizer management is critical to increase its adoption by maize (Zea mays L.) growers. The objective of this study was to establish nitrate and total nitrogen concentrations in the basal maize stalks (BMS) at harvest to separate maize fields among three N availability categories (N-deficient, N-optimum, and N-excess) under Mediterranean irrigated semiarid conditions. We analysed data from 26 irrigated maize trials conducted between 2001 and 2012. Trials included treatments receiving different N fertilizer rates and sources (mineral and organic), irrigation systems (flood, sprinkler) and soil types. The critical nitrate concentration in BMS to identify N-deficient plots (CNC L ) is affected by the irrigation system. The CNC L was lower under sprinkler irrigation (708 mg NO 3– ­–N/kg) than under flood irrigation (2205 mg NO 3– ­–N/kg), and the later presented a higher degree of uncertainty compared to sprinkler irrigated systems. The results showed the difficulty to identify the N-deficient plots with the BMS test and the higher sensibility of nitrate-N than total-N concentration in BMS to separate N-deficient from N-optimal plots. Under sprinkler irrigation, nitrate in BMS>1500 mg NO 3– –N/kg had a 85% probability of having received an excess of N. Considering economic net returns to N fertilization, the range of nitrate concentration in BMS that maximized profit under sprinkler-irrigated conditions was established between 1100 and 1700 mg NO 3– –N/kg. Results suggest that BMS test can be useful in detecting plots with an excess of N but considering irrigation efficiency is crucial for stablishing successful CNC thresholds.ca_ES
dc.description.sponsorshipThis study was financed by the Ministerio Español de Ciencia e Innovación (Projects No AGL2001-2214-C06-04, AGL2005- 08020-C05-01, AGL2009-12897-C02-02), by the INIA (SC00-061-C02-1, RTA04-114-C03-01) and by FEDER funds.ca_ES
dc.publisherInstituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA)ca_ES
dc.relation.isformatofReproducció del document publicat a
dc.relation.ispartofSpanish Journal of Agricultural Research, 2015, vol. 13 núm. 1, p. 1-12ca_ES
dc.rightscc-by (c) INIA, 2015ca_ES
dc.subjectBasal maize stalkca_ES
dc.subjectN fertilizerca_ES
dc.subjectSprinkler irrigationca_ES
dc.subjectFlood irrigationca_ES
dc.titleUtility of the end-of-season nitrate test for nitrogen sufficiency of irrigated maize under Mediterranean semi-arid conditionsca_ES

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