Effects of Seed Size, Sowing Orientation and Depth on Germination and Seedling Growth in Neem, Azadirachta indica

摘要

Seed germination and seedling growth of A. indica were affected by seed size and seeding depth. Large seeds germinated earlier with 95% total germination compared to small seeds with only 57% germination. Also, longer shoot-root lengths were observedin plants from large seeds. In seed orientation uniform germination and seedling growth were recorded. No significant impacts was recorded in different seed orientation on seed germination as well as seedling growth. Seedling morphology did not differ much among treatments. Similarly, seeds sown in the upper soil layer germinated more rapidly and proved better growth compared to sowing at 3 and 5 cm depths. Mean germination time, germination index, shoot and root growth, root collar diameter and numberof leaves followed the similar pattern.