Isotopic composition of maize as related to N-fertilization and irrigation in the Mediterranean region

Scientia Agricola

Berta Lasa²  Iosu Irañeta¹  Julio Muro¹  Ignacio Irigoyen¹  Pedro María Aparicio Tejo¹ 

[1] ,Universidad Pública de Navarra Dept. Ciencias del Medio Natural Pamplona,Spain

关键词: Zea mays L.;    furrow irrigation;    nitrogen;    sprinkler irrigation;    Zea mays L.;    irrigação por sulco;    nitrogênio;    irrigação por aspersão;   

DOI  :  10.1590/S0103-90162011000200008

来源: SciELO

【 摘 要 】

Nitrate leaching as a result of excessive application of N-fertilizers and water use is a major problem of vulnerable regions. The farming of maize requires high N fertilization and water inputs in Spain. Isotopic techniques may provide information on the processes involved in the N and C cycles in farmed areas. The aim of this work was studying the impact of sprinkler and furrow irrigation and N input on maize (Zea mays L.) yields, and whether isotopic composition can be used as indicator of best farming practices. Trials were set up in Tudela (Spain) with three rates of N fertilization (0, 240 and 320 kg urea-N ha-1) and two irrigation systems (furrow and sprinkler). Yield, nitrogen content, irrigation parameters, N fate and C and N isotope composition were determined. The rate of N fertilization required to obtain the same yield is considerably higher under furrow irrigation, since the crop has less N at its disposal in furrow irrigation as a result of higher loss of nitrogen by NO3--N leaching and denitrification. A lower δ13C in plants under furrow irrigation was recorded.The δ15N value of plant increased with the application rate of N under furrow irrigation.

【 授权许可】

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