Factors affecting seed and seedling vigour

Factors affecting seed and seedling vigour Seed vigour is a term encompass the sum total of those properties of the seed that consider the potential death penalty of the seed or seed lot during spr bying and seedling issue (Perry, 1978). Rapid and uniform germination atomic number 18 among the properties of vigorous seeds (Argerish & axerophthol; Bradford, 1989). number one vigour adversely affects such factors as best emergence, breed resistance and uniform growth of emergent seedlings (Patrick et al, 2000) and is thusly of majuscule economic importance. Seeds, which grow considerably under the rarefied conditions of the germination test, often do not fulfil 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 economic crisis vigour. A considerable amount of enquiry has been carried out to discover the causes of utter 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 integrity underlying cause. Seeds which are either teeny-weenyer or bigger than normal, are often of low vigour. Sawan et al (1999) appoint that both(prenominal) seed size and seed density are tally 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.

These shadow be removed from an otherwise healthy seedlot by seiving. The seedling characteristics most(prenominal) closely associated with lower seedling vigour are a small embryo, sm all 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 feature a low protein content. This may be due to teentsy nitrogen fertilisation. Application of more nitrogen will restore this problem... If you want to get a full essay, order it on our website: OrderEssay.net

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