3
Litchi fruit reaches optimum harvest maturity when total soluble solids : titratable acidity ratio reaches
EXPLANATION
Maturity Standards, Harvesting Indices & Ripe
- Harvest Maturity Index of Litchi (Litchi chinensis):
- Litchi is a non-climacteric fruit that must reach peak physiological ripeness on the tree before harvesting.
- The standard chemical maturity index is when the TSS : Titratable Acidity ratio reaches $\ge 40$ (TSS attains $18 - 20^\circ\text{Brix}$ while titratable acidity declines to $0.4 - 0.5\%$, yielding $\frac{20}{0.5} = 40$).
- Correct Option: Option 4 (40).
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