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The pressure chamber, also known as the pressure bomb, is a device equipped with a small gas cylinder, high pressure gauge, and a thick-walled metal chamber with a top in which a plant leaf petiole can be sealed. The amount of pressure that is required to force water from the cut base of a pressurized leaf or petiole provides an estimate of the water status of the plant.
Over the past two decades much of the irrigation research conducted on perennial fruit and nut crops in California, and much of the world, has used pressure chamber measurements of plant water status as the key indicator of the degree of water stress experienced by a tree. Some of this research has focused on improving or maintaining crop yields and/or quality by reducing irrigation during certain crop developmental periods. Saving water and improving fruit and nut quality by reducing irrigation in this manner is referred to as ‘regulated deficit irrigation.’ Researchers use...
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