Seed - Seed Production

Seed Production

Seeds are produced in several related groups of plants, and their manner of production distinguishes the angiosperms ("enclosed seeds") from the gymnosperms ("naked seeds"). Angiosperm seeds are produced in a hard or fleshy structure called a fruit that encloses the seeds, hence the name. (Some fruits have layers of both hard and fleshy material). In gymnosperms, no special structure develops to enclose the seeds, which begin their development "naked" on the bracts of cones. However, the seeds do become covered by the cone scales as they develop in some species of conifer.

Seed production in natural plant populations vary widely from year-to-year in response to weather variables, insects and diseases, and internal cycles within the plants themselves. Over a 20-year period, for example, forests composed of loblolly pine and shortleaf pine produced from 0 to nearly 5 million sound pine seeds per hectare. Over this period, there were six bumper, five poor, and nine good seed crops, when evaluated in regard to producing adequate seedlings for natural forest reproduction.

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Other articles related to "seed production, seed, seeds, production":

Thinopyrum Intermedium - Seed Production
... the primary use of Thinopyrum intermedium is as a forage, seed production is essential because farmers and ranchers continue to establish new stands by ... In 1988 over 500 metric tons of seed were harvested in Saskatchewan alone, although more recently the harvest has fallen to less than 225 metric tons in that ... Average seed yields are about 330 pounds per acre, but on-farm yields of up to 880 pounds per acre have been achieved ...
Silphium Perfoliatum - Description - Seed Production
... and skippers help to cross-fertilize flowers to produce seeds. 20 to 30 seeds are created in each flower head ... Each seed is about 9 to 15 mm long, 6–9 mm wide, flattened in shape, with a thickness of 1 mm ...
Carya Tomentosa - Life History - Reproduction and Early Growth - Seed Production and Dissemination
... The seed is dispersed from September through December ... a minimum of 25 years to reach commercial seed-bearing age ... Optimum seed production occurs from 40 to 125 years, and the maximum age listed for commercial seed production is 200 years ...
Carya Glabra - Life History - Seed Production and Dissemination
... Pignut hickory begins to bear seed in quantity in 30 years, with optimum production between 75 and 200 years (16) ... The maximum age for seed production is about 300 years ... Good seed crops occur every year or two with light crops in other years frost can seriously hinder seed production (22) ...

Famous quotes containing the words production and/or seed:

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