Cavitation in plants is caused by development of air bubbles, which is related\nto their equilibrium and development. There is a univariate cubic equation\nfor bubble balance. New root formula of this kind of equation was proposed\nby Shenjin Fan, which is simpler than the Caldanâ??s. Using Shenjin formulas\nand taking water pressure l P as an independent variable, this paper gives the\nexact solution of the equation under certain conditions. The stability of the\nequilibrium of an air bubble in its different radius ranges is obtained by the\nway different from the previous. This kind of cavitation includes two types:\nFirst type may be caused by the growth of pre-existent air bubbles; Second\ntype is air seeding, here defined as the sucking of air bubbles from already\ngas-filled conduits. For air seeding three ways of cavitation have been proposed.
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