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Cannabis sativa is an annual herbaceous flowering ... A Cannabis plant in the vegetative growth phase of its life requires more than 16–18 hours of light per day to ...
Cultivation of cannabis is the production of cannabis infructescences ("buds" or "leaves"). Cultivation techniques for other purposes (such as hemp production) differ.. In the United States, all cannabis products in a regulated market must be grown in the state where they are sold because federal law continues to ban interstate cannabis sales.
Principal growth stage 1: Leaf development (main shoot) 10: G, M: First true leaf emerged from coleoptile D: Cotyledons completely unfolded P: First leaves separated 11: First true leaf, leaf pair or whorl unfolded P: First leaves unfolded 12: 2 true leaves, leaf pairs or whorls unfolded 13: 3 true leaves, leaf pairs or whorls unfolded 1 .
The lower leaf pairs usually occur in an opposite leaf arrangement and the upper leaf pairs in an alternate arrangement on the main stem of a mature plant. The leaves have a peculiar and diagnostic venation pattern (which varies slightly among varieties) that allows for easy identification of Cannabis leaves from unrelated species with similar ...
Appearance and Growth Traits. A Sativa plant is usually tall and thin, with leaves that are long and narrow. A Sativa plant usually grows taller than other cannabis types, sometimes reaching over ...
The second component is the 'Unit Leaf Rate' (ULR), which is also termed 'Net Assimilation Rate' (NAR). This variable indicates the rate of biomass increase per unit leaf area, with typical values ranging from 5-15 g.m −2.day −1 for herbaceous species and 1-5 g.m −2.day −1 for woody seedlings. Although the ULR is not equal to the rate ...
Specific leaf area is a ratio indicating how much leaf area a plant builds with a given amount of leaf biomass: S L A = A M L {\displaystyle SLA\ =\ {\frac {A}{M_{L}}}} where A is the area of a given leaf or all leaves of a plant, and M L is the dry mass of those leaves.
A leaf area index (LAI) expresses the leaf area per unit ground or trunk surface area of a plant and is commonly used as an indicator of the growth rate of a plant. LAI is a complex variable that relates not only to the size of the canopy, but also to its density, and the angle at which leaves are oriented in relation to one another and to ...