Agricultural Water Management Proceedings of a Workshop in Tunisia (2007) / Chapter Skim
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Regulated Deficit Irrigation in Trees and Vines
Regulated Deficit Irrigation in Trees and Vines
Pages 70-80
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From page 70... ...
As water stress is imposed, the stomata close and that reduces both water loss and carbon uptake and thus, productivity. Indeed, preventing water stress forms the basis for most of the water budget irrigation scheduling programs that exist today, including CIMIS.
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From page 71... ...
The water stress results in lower tree water status, partial stomatal closure, which reduces ET (Fig.
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From page 72... ...
FIGURE 2 Mean data from the final three years of a four year study in the San Joaquin Valley of California of mature navel orange tree (‘Frost Nucellar') response to 14 RDI regimes compared with a fully irrigated Control showing a)
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From page 73... ...
FIGURE 3 Mean data from the first two years of a study in the San Joaquin Valley of California involving four RDI regimes on mature late harvest navels (‘Lane Late') compared with a fully irrigated Control showing applied water versus a)
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From page 74... ...
However, the unique fruit development pattern of pistachio nuts provides a period where the tree is relatively tolerant of stress: just after full shell size has been attained until the onset of rapid kernel growth. We refer to this as Stage 2 growth and it normally occurs from Mid May thru early July in the southern San Joaquin Valley of California.
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From page 75... ...
found significant improvement in irrigation water productivity in most of RDI regimes. Peach The pioneering RDI work in fruit trees was conducted on late harvest peaches (Chalmers et al., 1981)
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From page 76... ...
However, reducing berry size also reduces yield, assuming the same fruit load. Some believe that it's not necessary to impose stresses severe enough to reduce berry size in order to produce higher quality wine; that stress-related chemical changes in the fruit are primarily responsible (Matthews et al., 1990)
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From page 77... ...
Growers will be forced to consider whether the highest profit will be achieved by having their plants consume the water or selling it. If growers recognize that 200-300 mm can be saved using RDI without negatively impacting production and this water can add to their profit by being used elsewhere, RDI adoption is likely.
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From page 78... ...
1999. Continuous trunk diameter recording can reveal water stress in peach trees.
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From page 79... ...
2002. Effects of regulated deficit irrigation and partial root zone drying on late harvest peach tree performance.
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From page 80... ...
2000. Midday stem water potential as a plant water stress indicator for irrigation scheduling in fruit trees.
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