Oil, especially in larger quantities, negatively affects seed germination by delaying the process and reducing the frequency of successful germination and subsequent vegetative growth.
Here's a more detailed breakdown:
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Delayed Germination: Oil can create a barrier that inhibits the uptake of water and oxygen, both essential for seed germination. This physical barrier slows down the metabolic processes required for the seed to sprout.
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Reduced Germination Frequency: The presence of oil can be toxic to the developing embryo, reducing the number of seeds that successfully germinate.
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Impaired Vegetative Growth: Even if a seed manages to germinate in the presence of oil, the subsequent growth of the seedling can be stunted due to the oil's toxic effects on root development and nutrient absorption.
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Water Repellency: Oil is hydrophobic, meaning it repels water. This can exacerbate the issue of water uptake by the seed, further hindering the germination process.
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Oxygen Deprivation: Oil can fill the pore spaces in the soil, reducing the availability of oxygen to the seed. Seeds require oxygen for respiration, which is crucial for germination.
In summary, oil's presence inhibits seed germination by physically blocking water and oxygen intake, potentially poisoning the embryo, and disrupting the soil environment.
