摘要：Zinc (Zn) deficiency affects the metabolic and catalytic activities in plants inhibiting the protein synthesis, indirectly led the plant to senescence. Zn absorbed by the plants through leaves influences the growth and development; hence plays an inhibitory role for the process o f aging or senescence. To study the influence o f different Zn levels (0, 50, 65, 80 and 95mg L-1) and time o f its application as foliar spray (30, 50 and 70 days after transplantation) on seed production and fats content o f Nigella sativa L., a field experiment was carried out at Horticulture Research Farm, The University o f Agriculture, Peshawar, Pakistan. Results o f the current research showed that Zn @ 95mg L-1 significantly increased the plant height (cm), chlorophyll content (SPAD), number o f branches plant-1, number o f capsules plant-1, capsule length (mm), weight o f seeds capsule-1 (mg), number o f seeds capsule-1, 1000 seeds weight (g) and fats content (%). The foliar application o f Zn, 50 days after transplantation resulted in maximum plant height (cm), number o f branches plant-1, number o f capsules plant-1, capsule length (mm), weight o f seeds capsule-1 (mg), number o f seeds capsule-1, 1000 seeds weight (g) and fat content (%). It could be concluded that Zn when applied at 95mg L -1 improved most o f the studied attributes o f Nigellasativa as compared to the application o f Zn at 50, 65 and 80 mg L-1 respectively. Sim ilarly spray o f Zn, 50 days after transplantation was found best time o f application for the production o f Nigellasativa under the clim atic conditions o f Peshawar valley.
