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Over time, seeds lose viability, which is the ability to initiate metabolic activity, cellular growth, and germination. Seeds have many cells and tissues that die over time, [1] and these deaths can be delayed or increased by environmental conditions the seed experiences. Very generally, small seeds, especially from weedy species and annuals ...
The grass is variable. It can be annual or perennial, growing up to 1.5 meters tall or remaining much shorter. The stem can be up to a centimeter wide and dry to nearly succulent. The inflorescence is an open panicle with up to 50 branches. [3] This grass is grown for grazing and hay in some places, such as Costa Rica. [6]
Cowpea weevil (Callosobruchus maculatus) infests stored cowpea seeds, resulting in major postharvest losses. Severe C. maculatus infestations can affect 100% of the stored peas and cause up to 60% loss within a few months. [48] [49] The weevil generally enters the cowpea pod through holes before harvest and lays eggs on the dry seed. [50]
Dormancy should not be confused with seed coat dormancy, external dormancy, or hardheadedness, which is caused by the presence of a hard seed covering or seed coat that prevents water and oxygen from reaching and activating the embryo. It is a physical barrier to germination, not a true form of dormancy (Quinliven, 1971; Quinliven and Nichol ...
A Film coating, a layer of thin film applied to the seed typically less than 10% of the mass of the original seed. Encrustment, where the applied material is typically 100%–500% of the original seed mass, but the shape is still discernible. Pellet, where the applied material is so thick that the seed's original shape is not discernible.
The chilling requirement of a fruit is the minimum period of cold weather after which a fruit-bearing tree will blossom productively. It is often expressed in chill hours, which can be calculated in different ways, all of which essentially involve adding up the total amount of time in a winter spent at certain temperatures. [1] [2]
Rapeseed (Brassica napus subsp. napus), also known as rape and oilseed rape, is a bright-yellow flowering member of the family Brassicaceae (mustard or cabbage family), cultivated mainly for its oil-rich seed, which naturally contains appreciable amounts of mildly toxic erucic acid. [2]
[215] [216] Paleoecological studies of soils places the origin for bioturbation to a time before the Cambrian period. Other events, such as the evolution of trees and the colonization of land in the Devonian period played a significant role in the early development of ecological trophism in soils. [214] [217] [218]
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