Symptoms of boron deficiency were induced in sand culture under polyhouse condition to study the effect of boron supply on growth and uptake of other macro and micro-nutrients and to find out the leaf boron concentration required for optimum growth of plants. Maximum height of seedling (20.00 cm) and number of leaves per seedling (22.60) were registered with T5 (control) whereas minimum 12.79 cm and 18.73 were registered with T9 and T5 (2 times of total boron) respectively. Maximum length (2.73 cm) and breadth (1.71 cm) of leaf were recorded with T6 and T5 and minimum length(2.35cm) and breadth(1.38 cm) with T1 (solution without boron), respectively. Fresh weight (0.071 g) and dry weight (0.0165 g) of leaf were found maximum in T6 (solution containing 1.25 times of total boron) and T5 (control). Maximum leaf area per seedling (2.85cm2) was recorded in T7 (solution containing 1.50 times of total boron). Maximum stem girth of seedling (0.254cm) was recorded in T4 (solution containing ¾th of total boron) and maximum length of primary root (16.46 cm) was recorded with treatment T5 (control). Increasing boron supply influenced the leaf nitrogen, phosphorus, potassium and calcium content significantly. Leaf nitrogen content was maximum (1.36 per cent) in T5 (control). The leaf phosphorus content was highest in T6 (0.28 per cent). Maximum leaf potassium content (1.07 per cent) was registered with T9 whereas minimum was recorded in T5 (control). The leaf calcium content was recorded maximum (2.29 per cent) with T6. The boron content increased significantly with the increase in boron supply. The maximum boron content (55.00 ppm) was recorded with T9. Other nutrients did not influence by variable boron supply. The critical level of boron was recorded 43 ppm in Karonda seedlings in sand culture.
