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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 75, No. 1, 2015, pp. 111-121
Bioline Code: cj15016
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 75, No. 1, 2015, pp. 111-121

 en Contribution of legumes to the availability of soil nitrogen and its uptake by wheat in Mediterranean environments of central Chile
Espinoza, Soledad; Ovalle, Carlos; Zagal, Erick; Matus, Iván & del Pozo, Alejandro

Abstract

The absorption and partitioning of N is determined by its availability and demand during the various phenological stages of the crop. In two experiments conducted in rainfed areas of the Mediterranean climate region of central Chile, legume-wheat ( Triticum aestivum check for this species in other resources L.) rotations were compared to oat ( Avena sativa check for this species in other resources L.)-wheat systems (with and without applications of N fertilizer). The objective was to assess the contribution of legumes to the availability of soil N and N uptake by the wheat crop following grain legumes. N mineralization and uptake, N use efficiency (NUE), and N uptake efficiency (NUpE) by wheat were evaluated at different phenological stages in 2010. Synchronization existed between accumulated soil N mineralization and N uptake by the wheat. N uptake by wheat was higher in Experiment II (Andean foothill) than in Experiment I (interior dryland). Grain yields after legumes ranged 60-110% and 72-103% of yields in the fertilized cereal rotation (oat-wheat) in Experiments I and II, respectively. There was high correlation between soil N availability vs. grain yield (R2 = 0.84 and 0.64) and N uptake vs. grain yield (R2 = 0.55 and 0.64) for Experiments I and II, respectively. Rotations with lupine ( Lupinus check for this species in other resources spp.) and field peas ( Pisum sativum check for this species in other resources L.) showed high NUE and NUpE in Experiment I, and Experiment II in pea. The lowest NUE was after oats with N fertilizers. It is concluded that wheat cultivated in both agro-ecological areas after grain legumes or green manure was more efficient in N uptake and use than cereal, especially when the latter was fertilized.

Keywords
Alfisol; Andisol; crop rotation; field peas; lupins; N uptake; oat; Triticum aestivum; vetch

 
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