María De Bernardi
Evaluation of GHG in
pastures with foliar N
fertilizers
Project: Nitrous oxide
emissions from pastures
using novel fertilizer
formulations

Purpose of research
Nitrogen Use Efficiency (NUE) in PASTURES
Foliar N fertilizer and N nanofertilizer
Major goals
• Increase pasture NUE using a foliar N
formulations in pasture
• Determining N balance
• The effect in N cycling
Objective
• Measured N2O emission and NH3
volatilization
• My contribution was in measuring and
interpretation of CH4 flux

Research methods
• Research site
Conditions:
 Tempeture
20°C (Control
temperature
room)
 50%WHC
Pre-essay site:
INIA Remehue
Essay site:
INIA La Pampa

Research methods
• Control (bare soil)
• Control (With plant)
Fertilizers
• Nanofertilizer 1 (Hap)
• Nanofertilizer 2 (comertial)
• N Foliar (Ammonium nitrate)
• Urea disolved Water
• Granular Urea
Pre-essay
Essay
CH4 and N2O
Fluxes
Ammonium
volatilization
Soil parameters (nutrients, bulk
density, humidity)
Plant parameters (total N and C,
dry mass)

Results
• Pre-essay
0 110 220 330 440 550
0,00
0,04
0,08
0,12
0,16
0,20
0,24
0,28
0,32
N2
OFlux(mgN2
O-Nh
-1
m
-2
)
Time (hs)
Control with plant
Urea disolve in water
Ammonium nitrate
Nano-comertial
Nano-INIA
-0,05
-0,04
-0,03
-0,02
-0,01
0,00
Control
Disolve Urea
Control
Ammonium nitrate
0 110 220 330 440 550
-0,05
-0,04
-0,03
-0,02
-0,01
0,00
Control
Nitramin
Time (hs)Time (hs)
0 110 220 330 440 550
Control
Nanop
CH4
flux(mgCH4
-Ch
-1
m
-2
)
• Principal essay: Expectations
Sampling times: periodicity and range
Wetting period
Principals differences

Advice to future CLIFF-GRADS students
• Get involve completely in fieldwork as a
organizer and a person in charge
• Get involve in results and discussion
• Continue in touch with yours host
researchers