Principles and Methods p 117 (1929)
Ivan Michurin

High Atmospheric Pressure

In some years, in the latter part of August, there is a long period of constant high atmospheric pressure (between 760 and 770 mm). This, according to my observations, greatly affects the organisms of perennial plants and forces some of them to bloom again in the autumn.

In such cases, certain varieties of apple, cherry, mountain ash, bird cherry, and others have a second budding.

In such years a second flow of sap is also observed in hybrid seedlings, and this causes the plants to suffer considerable damage from autumn frost, against which we cannot take any measures; but in selecting we must not reject such damaged hybrids as lacking hardiness.

Nagy, Grabherr: Atmospheric Pressure (2009)

Atmospheric Pressure, Plant Growth & Development