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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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University of Extremadura, Forestry School of Plasencia

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University of extremadura forestry school of plasencia

Universityof Extremadura, ForestrySchoolofPlasencia

The role of trees for Nitrate leaching after Organic and Mineral fertilization

ML López-Díaz, G Moreno, V Rolo


University of extremadura forestry school of plasencia

Introduction

Agriculture

Directive 80/788/CEE

Fertilization rate

Nitrate leaching

Irrigation systems

Directive 91/676/CEE

Underground water


University of extremadura forestry school of plasencia

Introduction

PROBLEM

Nitrate

leaching

SOLUTION

Agroforestry

Systems

Organic

Fertilization

Tree – pasture root system

Gradual N mineralization

LIXIVIATED NITRATE


University of extremadura forestry school of plasencia

Aims


University of extremadura forestry school of plasencia

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


University of extremadura forestry school of plasencia

Materials and Methods

Tree Basal Diameter

Pasture Production

Parameters analyzed

Profile of Nitrate Content

Nitrate Lixiviated

Rooting profile


University of extremadura forestry school of plasencia

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


University of extremadura forestry school of plasencia

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


University of extremadura forestry school of plasencia

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


University of extremadura forestry school of plasencia

Results & Discussion

Root system

Pasture

Tree


University of extremadura forestry school of plasencia

Results & Discussion

Production


University of extremadura forestry school of plasencia

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


University of extremadura forestry school of plasencia

THANKS FOR YOUR ATTENTION

Victor Rolo


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