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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.

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Universityof Extremadura, ForestrySchoolofPlasencia

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

Nitrate leaching

Irrigation systems

Directive 91/676/CEE

Underground water


Introduction

PROBLEM

Nitrate

leaching

SOLUTION

Agroforestry

Systems

Organic

Fertilization

Tree – pasture root system

Gradual N mineralization

LIXIVIATED NITRATE


Aims


Materials and Methods

Systems

D  Bare soil

P  Pasture

S  Tree

SP  Tree & pasture

Fertilization

NF  No fertilize

L  Sewage Sludge

M  Mineral

Greenhouse experiment

n = 6

120 pots: 20 cm Ø, 120 cm height

Soil: pH 4.7; 1 g N kg-1; 10 g Organic C kg-1


Materials and Methods

Tree Basal Diameter

Pasture Production

Parameters analyzed

Profile of Nitrate Content

Nitrate Lixiviated

Rooting profile


Results & Discussion

NO3- Content in the Soil Profile

NO3- , mg / Kg soil

NO3- , mg / Kg soil

Depth, cm

Depth, cm

Systems

D  Bare soil

P  Pasture

S  Tree

SP  Tree & pasture

Fertilization Treatments

NF  No fertilize

M  Mineral

L  Sewage Sludge


Results & Discussion

Nitrate Lixiviation and Fertilization Rates

Fertilization

Nitrate, g /m2

Date

Nitrate, g /m2

Fertilization Treatments

NF  No fertilize

M  Mineral

L  Sewage Sludge

2006

2007

Fertilization Treatment


Results & Discussion

Nitrate Lixiviation and Systems

Fertilization

Nitrate, g /m2

Nitrate, g /m2

System

Date

Systems

D  Bare soil

P  Pasture

S  Tree

SP  Tree & pasture

2006

2007


Results & Discussion

Root system

Pasture

Tree


Results & Discussion

Production


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


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