Saturday, October 26, 2013

Factors affecting seed and seedling vigour

Factors affecting generator and seedling vigour Seed vigour is a term encompass the sum total of those properties of the seed that watch over the potential death penalty of the seed or seed lot during spr pop outing and seedling issue (Perry, 1978). Rapid and uniform germination atomic number 18 among the properties of vigorous seeds (Argerish & axerophthol; Bradford, 1989). moo vigour adversely affects such factors as best emergence, strain resistance and uniform growth of emergent seedlings (Patrick et al, 2000) and is thusly of expectant economic importance. Seeds, which grow hale under the rarefied conditions of the germination test, often do not effect so well when planted under the more stressful conditions of the field. nearly seedlots perform particularly badly under stress, and are utter to be of mortified vigour. A considerable amount of enquiry has been carried out to discover the causes of low vigour, since if it could be prevented, fewer low-vigo ur seedlots would fill to be wasted (pers.comm. Dr. A. Goldsworthy, 2003). Unfortunately, there does not seems to be a iodine underlying cause. Seeds which are either pocket-sizeer or large than normal, are often of low vigour. Sawan et al (1999) appoint that both seed size and seed density are jibe with seedling vigour in cotton. Small seeds may wish sustenance reserves, and large seeds may be more well discredited by harvesting or dedicate metabolous abnormality.
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These terminate be removed from an otherwise healthy seedlot by seiving. The seedling characteristics near closely associated with lower seedling vigour are a small embryo, small p! rimary leaves on the main shoot, a low leaf area to leaf weight ratio, and a low frequency of coleoptile tillers (Richards & Lukacs, 2002). Sometimes low vigour seeds bedevil a low protein content. This may be due to petty(a) nitrogen fertilisation. Application of more nitrogen will meliorate this problem... If you want to get a full essay, order it on our website: OrderCustomPaper.com

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