Grape Chemistry (updated 9-1-07)

Varietal

 

Date

 

Grape Chemistry Readings

 

Sugar (brix)

 

Total Acid     

 

(% tartaric)

 

pH

 

Barbera

 

8-05-07

 

20.6

 

1.89

 

2.91

 

8-12-07

 

25.5

 

1.55

 

3.04

 

8-18-07

 

27.4

 

1.40

 

3.07

 

      8-25-07

 

27.5

 

1.28

 

3.10

 

 

 

 

 

Primitivo

 

8-05-07

 

20.4

 

1.25

 

3.04

 

8-12-07

 

21.7

 

1.10

 

3.08

 

8-18-07

 

23.1

 

1.00

 

3.09

 

8-25-07

 

26.4

 

0.75

 

3.24

 

9-1-07 (BL 6)*

 

27.2

 

0.82

 

3.40

9-1-07 (BL 7)*

 

27.4

 

0.80

 

3.41

 

*BL 6= Block 6; BL 7= Block 7.  The TA drop last week seemed unusually precipitous, and this week’s data suggests it was likely in error.  Primitivo seems near-ideal for picking based on chemistry and juice color.