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The BBCH-scale (weed) identifies the phenological development stages of weed species. It is a plant species specific version of the BBCH-scale. D = Dicotyledons G = Gramineae M = Monocotyledons P = Perennial plants V = Development from vegetative parts or propagated organs No code letter is used if the description applies to all groups of plants.
Environmental impact of cannabis cultivation includes all the environmental issues which occur as a result of cannabis cultivation. Cannabis agriculture is a massive industry in its scope and extent, yet its environmental impact is much less researched than comparable agricultural products produced at this scale. [ 1 ]
The stage begins with the emergence of the flower protected by the last bract leaf (1st sterile bract) 61: 601: 6010: A bract which does not protect any hand of flowers rises (2nd sterile bract) and the rachis or flower stalk takes a pendulum position 62: 602: 6020: The bract rises which protects the first hand of female or pistillate flowers ...
Plants emit audio acoustic emissions between 10–240 Hz as well as ultrasonic acoustic emissions (UAE) within 20–300 kHz. Evidence for plant mechanosensory abilities are shown when roots are subjected to unidirectional 220 Hz sound and subsequently grow in the direction of the vibration source. [6]
Indicator value is a term that is used in the ecology of plants for two different indices. The older usage of the term refers to Ellenberg's indicator values from 1974, which are based on a simple ordinal classification of plants according to the position of their realized ecological niche along an environmental gradient. [1]
Cannabaceae are often dioecious (distinct male and female plants). The flowers are actinomorphic (radially symmetrical) and not showy, as these plants are pollinated by the wind. As an adaptation to this kind of pollination, the calyx and corolla are radically reduced to only vestigial remnants found as an adherent perianth coating the seed. A ...
The flowers of Cannabis sativa plants are most often either male or female, but, only plants displaying female pistils can be or turn hermaphrodite. Males can never become hermaphrodites. [ 3 ] It is a short-day flowering plant, with staminate (male) plants usually taller and less robust than pistillate (female or male) plants.
The Storie index is a method of soil rating based on soil characteristics that govern the land's potential use and productivity capacity.Developed by R. Earl Storie at University of California, Berkeley in the 1930s as a method of land valuation, it is independent of other physical or economic factors that might determine the desirability of growing certain plants in a given location.