ven2lecc11_(effectenviron_ongrowth)

ven2lecc11_(effectenviron_ongrowth) - VEN 2 Effects of...

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VEN 2 Effects of environmental factors and cultural practices on growth and fruit composition of grapes.
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How do water deficits affect the growth and development of grapevines?
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Growth is more affected by water deficits than is photosynthesis. Once the canopy is fully developed (maximum canopy size fitting the trellis system) vines can undergo water stress with less of an effect on photosynthesis (carbohydrate production)
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Relationship between grape leaf Pn and leaf water potential. No Stress High Stress
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Reproductive growth is less affected by water deficits than is vegetative growth. Once your canopy has achieved its desired size, vines can be deficit irrigated with minimal effects on the growth of the fruit and ultimately yield.
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Values next to the data points are % of the maximum pruning weight.
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Values next to the data points are % of the maximum berry weight.
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Values next to the data points are % of the maximum yield.
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Sugar accumulation in the fruit is less affected by water deficits than is berry growth. Deficit irrigation close to harvest may not delay the accumulation of sugar in the fruit One must be concerned if the vines are not being irrigated and the temperature becomes very hot.
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Important note: The process of photosynthesis will diminish greatly if the vines are severely water stressed and ambient temperature is high (greater than 100 o F or 38 o C ). This may delay the accumulation of sugars in the fruit!
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How do berries grow? Berry growth is divided into three Stages: I, II and III. During Stage I growth is by cell division and expansion . During Stage II there is little or no growth. During Stage III growth occurs only by cell expansion . Veraison occurs between Stages II and III.
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Berry Growth is more sensitive to water deficits during Stage I than III Water stress during Stage I will have more of an effect on final berry size than water stress during Stage III. Cell division is affected by water deficits during Stage I. It is difficult to increase final berry size by irrigating with more water during Stage III. The ability to stress vines during Stage I is dependent upon the availability of soil moisture and evaporative demand.
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The effect of irrigation management strategy and irrigation amount  on berry weight of Cabernet Sauvignon grown near Paso Robles  the first  two years of the study.   Irrig. ------------------Irrigation Amount ----------------- Strategy Time   0.375   0.56   0.75   1.12 Dry Dwn 2002 ------------- Berry weight (g 150 -1  berries)  --------------  SuDI S - H    118   135   156   156    116  RDI S - V    123   137   157     --      --  RDI V - H     140           151           155             --                -- 2003  SuDI S - H    115   127   146   155    137 RDI S - V    127   136   148     --      --
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ven2lecc11_(effectenviron_ongrowth) - VEN 2 Effects of...

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