University of Extremadura, Forestry School of Plasencia
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University of Extremadura, Forestry School of Plasencia The role of trees for Nitrate leaching after Organic and Mineral fertilization ML López-Díaz, G Moreno, V Rolo
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University of Extremadura, Forestry School of Plasencia. The role of trees for Nitrate leaching after Organic and Mineral fertilization. ML López-Díaz, G Moreno, V Rolo. Introduction. Agriculture. Directive 80/788/CEE. Fertilization rate. - PowerPoint PPT Presentation
Transcript of University of Extremadura, Forestry School of Plasencia
University of Extremadura, Forestry School of Plasencia
The role of trees for Nitrate leaching after Organic and
Mineral fertilization
ML López-Díaz, G Moreno, V Rolo
Introduction
Underground water
Agriculture
Nitrate leaching
Directive 80/788/CEE
Directive 91/676/CEE
Fertilization rate
Irrigation systems
Introduction
PROBLEMNitrate leaching
SOLUTION
Agroforestry Systems
OrganicFertilization
Tree – pasture root system Gradual N mineralization
LIXIVIATED NITRATE
Soil Nitrate
Pasture
Fertilization Treatments
Tree
Aims
Materials and Methods
Systems
D Bare soil P Pasture S TreeSP Tree & pasture
Fertilization
NF No fertilize L Sewage Sludge M Mineral
Greenhouse experimentn = 6
120 pots: 20 cm Ø, 120 cm heightSoil: pH 4.7; 1 g N kg-1; 10 g Organic C kg-1
Materials and Methods
1 2
3
4 5
Par
amet
ers
anal
yzed
Tree Basal Diameter Pasture Production
Nitrate LixiviatedProfile of Nitrate Content
Rooting profile
Results & Discussion
NO3- Content in the Soil Profile
0
20
40
60
80
100
120
0 5 10 15
Prof
undi
dad,
cm
NO3-, mg/kg suelo
D
P
S
SP
NO3- , mg / Kg soil
Dep
th, c
m
Systems
D Bare soil P Pasture S TreeSP Tree & pasture
0
20
40
60
80
100
120
0 1 2 3 4 5 6
Prof
undi
dad,
cm
NO3-, mg/kg suelo
L
M
NF
Dep
th, c
m
NO3- , mg / Kg soil
Fertilization Treatments
NF No fertilize M Mineral L Sewage Sludge
Results & Discussion
Nitrate Lixiviation and Fertilization Rates
0
20
40
60
80
100
120
14-12-05 24-3-06 2-7-06 10-10-06 18-1-07 28-4-07 6-8-07 14-11-07
Fecha
Nitr
ato,
g /
m2
NFM30M60L30L60
Fertilization
Nitr
ate,
g /m
2
Fertilization Treatment
20062007
AÑO*ferdos ; LS Means
Current effec t: F(4, 100)=90,908, p=0,0000Effective hypothesis decompos ition
Vertical bars denote 0,95 confidence intervals
AÑ0 2006 AÑO 2007
NF M1 M2 L1 L2
Tratamiento de ferti l izac ión
0
50
100
150
200
250
Nitr
ato,
g /
m2
Date
Nitr
ate,
g /m
2
Fertilization Treatments
NF No fertilize M Mineral L Sewage Sludge
Nitrate Lixiviation and Systems
Results & Discussion
AÑO*SIST; LS Means
Current effect: F(3, 100)=23,484, p=,00000Effec tive hypothesis decomposition
Vertical bars denote 0,95 confidence intervals
AÑO 2006 AÑO 2007
D P S SP
SISTEMA
0
50
100
150
200
250
Nitr
atos
, g /
m2
System
Nitr
ate,
g /m
2
20062007
0
1020
30
40
50
60
70
80
14-12-05 24-3-06 2-7-06 10-10-06 18-1-07 28-4-07 6-8-07 14-11-07
Fecha
Nitr
ato,
g /
m2
DPSSP
Fertilization
Date
Nitr
ate,
g /m
2
Systems
D Bare soil P Pasture S TreeSP Tree & pasture
Results & Discussion
Root system
Tree
Pasture
0102030405060708090
100
0 2 4 6 8 10 12
Dep
th, c
m
Root Surface Density, m2 m-3
Tree
Tree + Pasture
0102030405060708090
100
0 10 20 30 40 50 60
Dep
th, c
m
Root Surface Density, m2 m -3
PasturePasture + Tree
Results & Discussion
Production
0
1000
2000
3000
4000
P SP (Pasture)
Past
ure y
ield
, Kg
ha-1
year
-1
No significant differences
0
2
4
6
8
10
12
S SP (Tree)
Bas
al D
iam
eter
, mm
No significant differences
Conclusions
The use of agroforestry systems are a good tool to control the nitrate leaching adjusting properly the fertilization rate to minimize the competitive effect
between vegetation layers
THANKS FOR YOUR ATTENTION
Victor Rolo
