Influência da aplicação de azoto e irrigação na emissão de gases com efeito de estufa e produção de biomassa no cardo

Hoje publicamos mais um artigo no Open Agriculture Journal sobre os efeitos da fertilização e fertirrigação no produção de biomassa do cardo e na emissão de gases com efeito de estufa.

Parabéns à equipa liderada pelo José Luis Pereira, com colegas e a aluna Manuela Antunes.

https://openagriculturejournal.com/VOLUME/14/PAGE/108/

Background:

Cardoon is a multi-purpose crop with a wide spectrum of potential applications.

Objective:

The aim of this study was to assess the effects of nitrogen (N) application and drip irrigation practices on emissions of nitrous oxide (N₂O), carbon dioxide (CO₂) and methane (CH₄) and morphological characterization and biomass production of cardoon crop.

Methods:

The experiment was run under field conditions from April to August 2018. The field experiment was a randomized complete block design with three replications and four treatments: (i) non-amended soil as control (CONTR); (ii) mineral N fertilizer and non-irrigated (NITRO); (iii) non-fertilized and drip irrigation (IRRIG); and (iv) mineral N fertilizer and drip irrigation by fertigation (FERTI). The fluxes of N₂O, CO₂ and CH₄ were measured by the closed chamber technique and the morphological characteristics and yield of cardoon plants were evaluated per treatment.

Results:

Results showed that the N₂O emissions and global warming potential were not significantly different among the application of mineral N fertilizer itself or by drip fertigation with an emission rate of 0.5% of N applied and -6,8 t CO₂-eq. ha^-1. The characteristics related to biomass production did not differ significantly (p>0.05) between amended treatments although numerically higher in IRRIG treatment.

Conclusion:

It was concluded that the application of mineral N fertilizer itself or drip fertigation had no significant effect on N₂O emissions and global warming potential. Additionally, the plant growth, including biomass production, increased due to drip irrigation, but not significantly.