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International Journal of Botany
Year: 2013  |  Volume: 9  |  Issue: 2  |  Page No.: 86 - 90

Allelopathic Possessions of Festering Walnut Leaf on Radish (Raphanus sativus L.) Seed Germination and Sprout Growth in Uttarakhand Himalaya

Abhishek Bahuguna, B.K. Chaubey, Mayank Nautiyal, Sandhya Bahuguna and Bhagat Singh    

Abstract: Phytotoxic effects of aqueous extracts of walnut leaf was studied on germinating seeds and early seedling growth of radish (Raphanus sativus L. cv. pusa chetki) under western Himalayan horti-silvi system. Radish seeds were treated with five treatments comprised of distilled water (Control), 40, 60, 80 and 100% concentration of leaf extracts. The effect of aqueous extracts was found inhibitive with concentration dependent manner on seed germination and subsequent seedling growth. The variety exhibited extent of phytotoxicity at 100% extracts application in comparison to untreated control. Invariably there was a decrease in first count, germination, seedling root and shoot length, seedling fresh and dry weight with increasing aqueous extracts concentration on germinating radish (psusa Chetki). Present investigation shows that the tree species have allelopathic potential and contain water-soluble substances. Seed germination, seedling elongation and weights were determined on date of final count, however, other seedling vigor i.e. vigor index, speed of germination index, Relative Growth Index (RGI), Mean Daily Germination (MDG), Mean Germination Time (MGT) and time to 50% germination (T50) were calculated as per their respective formula. The significant reduction in seed germination and seedling vigor were observed of walnut leaf extracts on radish. However, MGT and T50 is indicated as lower value for higher vigor were increased as the leaf extract concentration increased and found significantly lowest in control for radish. It was found that seed germination and seedling vigor of radish were affected negatively by walnut leaf extracts in concentration dependent manner.

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