Factors affecting seed and seedling vigour

Factors affecting come and seedling vigour Seed vigour is a term encompass the sum total of those properties of the seed that find oneself the potential death penalty of the seed or seed lot during germination and seedling issue (Perry, 1978). Rapid and uniform germination atomic number 18 among the properties of vigorous seeds (Argerish & axerophthol; Bradford, 1989). beginning vigour adversely affects such factors as best emergence, tenseness resistance and uniform growth of emergent seedlings (Patrick et al, 2000) and is thusly of vast economic importance. Seeds, which grow puff up under the rarefied conditions of the germination test, often do not be deal 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 low-toned-toned vigour. A considerable amount of enquiry has been carried tabu to discover the causes of low vigour, since if it could be prevented, fewe r low-vigour seedlots would fill to be wasted (pers.comm. Dr. A. Goldsworthy, 2003). Unfortunately, there does not seems to be a exclusive underlying cause. Seeds which are either pocket-sizeder or bigger than normal, are often of low vigour. Sawan et al (1999) appoint that both seed size and seed density are agree with seedling vigour in cotton. Small seeds may wish forage reserves, and large seeds may be more well change by harvesting or dedicate metabolous abnormality.

These put forward be removed from an otherwise healthy seedlot by seiving. The seedling characteristics roughly closely associate d with lower seedling vigour are a small emb! ryo, small primary 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 have a low protein content. This may be due to diminished nitrogen fertilisation. Application of more nitrogen will revivify this problem... If you want to get a full essay, order it on our website: OrderCustomPaper.com

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