Winter wheat and summer shade

W

INTER WHEAT AND SUMMER SHADE

UNIVERSITY OFLIEGE& GEMBLOUXAGRO-BIOTECH, 1_{AGRICULTUREISLIFE PLATEFORM,} 2 _{FORESTNATURE& LANDSCAPE DEPT. GEMBLOUX, BELGIUM,} 3_{UMR SYSTEM, MONTPELLIER, FRANCE}

sidonie.artru@ulg.ac.be

Measured variables Period

Biomass

5 times before harvest LAI (leaf area index)

Yield components Harvest time

PAR(photosynthetic active radiation) All growing season

SIDONIEARTRU1 LUDIVINELASSOIS2 SARAHGARRÉ1 CHRISTIANDUPRAZ3

• 3 light treatments: No shade,

variable shade and constant shade

• 4 replications

Light use efficiency Grain quality Crop yield

Partitioning of the dry matter

H

OW DOES WINTER

-

WHEAT GROW UNDER SHADE

?

Shade impact on

Comparison between treatements

LIGHT ENVIRONMENT UNDER TREES

H

OW TO SIMULATE AGROFORESTRY SHADE

?

To mimic: winter wheat & hybrid walnut agroforestry ❷ Temporal variability and

shade intensification ❶ Spatial variability

❸ Direct and diffuse light transmission

❶

a

❷

a

❸

a

*

* Varella et al.,2011. Do light and alfalfa responses to cloth and slatted shade represent those measured under an agroforestry systems.

Installation of shade layers duringwheat

and walnutcross-phenological period

❶

a

❷ &

a

❸

a

Sensors’ position

Cumulated global radiation

(MJ.m².hour) (H ou r) Camouflage net 2 1 1 2 1 1 Intensification of shade from budburst to the end of leaf expansion

A

GROFORESTRY IN BELGIUM SOIL AND CLIMAT CONTEXT

Hypothesis

Light is the principal competed resource between tree/crop in agroforestry

Constraint

Only young agroforestry plot (1-7 years old)

Objective

Evaluate the effect of light reduction on winter wheat growth and productivity