Walnut blight symptoms - Cost 873
Walnut blight symptoms - Cost 873
Walnut blight symptoms - Cost 873
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Results : Soil and management practices influence<br />
Huge differences of soil<br />
Soil characteristics Bouscarel Soursac<br />
% Clay 12,5 % 57,8 %<br />
% organic mater 1,28 % 3,26 %<br />
pH 6,57 8<br />
CaO (g/kg) 1,41 9,19<br />
CEC* Metson (Cmol+/kg) 3,7 22,45<br />
* Cation Exchange Capacity<br />
Opposite management practices<br />
• Mature sheep manure brought every year since plantation on Soursac orchard<br />
• Mineral fertilization on Bouscarel orchard,<br />
• Soursac has never been spaying with chemicals in contrast with Bouscarel<br />
Influence on tree vigour<br />
<<br />
Orchard<br />
Trunk mean<br />
circumference (cm)<br />
Mean annual growth<br />
since plantation (cm)<br />
Bouscarel 91,85 ± 7,8 a + 6,1 a<br />
Soursac 72,8 ± 4,6 b + 5,6 b<br />
‣ Less vigour = less sensitivity during growth => hardiest trees <br />
COST <strong>873</strong> – <strong>Cost</strong>iera 2009 - Italy
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