Presentation on theme: "The Physiology of the Vine Chapter 6. Transpiration Loss of water by the plant Water required for a normal growing season is 15 to 50 acre-inches."— Presentation transcript:
Transpiration Loss of water by the plant Water required for a normal growing season is 15 to 50 acre-inches. External conditions that affect the rate of water loss are light intensity, temp. humidity, and wind.
Water intake by the roots Root hair Cohesive forces Osmotic pressure Losses due to late pruning, 5 to 7 gallons per vine.
Absorption of mineral nutrients Ionic solution through the root hair.
Properties of Photosynthesis CO 2 O2O2 H20H20++CH0 H20H20
Factors Affecting the Rate Light Quality Light Intensity Light duration Carbon Dioxide Temperature Water Availability Plant Development
Annual Cycle of the Vine Breaks dormancy when the daily temp is about 50 0 F mean. After the first month of bud break is the most active growing period of the vine. Shoots continue to grow all year until abscission occurs. Bloom occurs when the temp reaches 68 0 F daily mean.
Annual Cycle of the Vine The accumulation of soluble solids occur in the berries. (Sugar) Carbs. & Starches are transferred to the roots prior to dormancy.