Water regime affects soil N2O emission and tomato yield grown under different types of fertilisers

• Main Authors: Luca Vitale, Anna Tedeschi, Franca Polimeno, Lucia Ottaiano, Giuseppe Maglione, Carmen Arena, Anna De Marco, Vincenzo Magliulo
• Format: Article
• Language: English
• Published: PAGEPress Publications 2017-10-01
• Series: Italian Journal of Agronomy
• Subjects: Fertiliser; plant growth; water regime; N2O emission; global environment; tomato.
• Online Access: https://www.agronomy.it/index.php/agro/article/view/989
• ISSN: 1125-4718; 2039-6805

Tomato plants were subjected to three fertilisation treatments (M: mineral fertiliser; DMPP: mineral fertiliser + 3,4- dimethylpyrazole phosphate; OM: NKP + organic animal manure) in combination with two water regimes (100% and 50% evapotranspiration). Plant biomass, fruit production, nitrogen use efficiency (NUE) and N uptake, maximal PSII photochemical efficiency, Fv/Fm and cumulative soil N2O emission were determined. Well-watered OM plants showed higher values of biomass, fruit production, NUE and N uptake than M and DMPP plants; cumulative N2O fluxes were lower in DMPP plots than in M and OM plots. The reduced water supply determined a drop in crop biomass, fruit production, NUE and N uptake, and cumulative N2O fluxes in M and OM treatments that were higher in OM plots, whereas it determined a significant rise in cumulative N2O fluxes in DMPP plots that was lower in absolute term compared to M and OM plots recorded under well-water irrigation. It can be concluded that DMPP added-fertiliser has a good performance in semiarid environment resulting a better nitrogen source compared to conventional and organo-mineral fertilisers under reduced water supply, able to preserve crop yield and to determine soil N2O emissions (as expressed in CO2 eq) not dangerous for global environment.