Abstract
The effects of nitrogen (N) fertilizer (0, 20, 30, 40 and 50 g N plant") applied in two splits, first on 1 5t Mar. 2003, before the onset of flowering and 60 days after application of first dose, on Rosa chinensis cv. Gruss-an-teplitz were studied to observe the impact of nitrogen on plant growth, flower production and nitrogen contents in leaves at various stages of flowering as a mean of achieving better management, production and ascertaining nitrogen utilization by plants. Number of leaves plant", leaf area, number of flowers and fresh weight of flowers plant" were maximum with 30 g N plant" whereas leaf N contents were maximum with 20 g N plant". Moreover, number of leaves plant", leaf area and leaf N contents were maximum in June whereas number of flowers and fresh weight of flowers plant" was more in April followed by March as compared to May and June. Nitrogen application @ 30 g N plant" in April produced maximum flower yield whereas vegetative growth was maximum with same dose of N in June. Key words: Nitrogen efficiency, Rosa chinensis, Gruss-an-teplitz, leaf N % age
