| چکیده انگلیسی مقاله |
The aim of the present study was to examine the effect of nitrogen application rate and harvest time on yield components of four cultivars of okra (Abelmoschus esculentus L.) such as seed characteristics and pod production, in relation to sowing date. Seeds of four okra cultivars, namely cv. ‘Boyatiou’, cv. ‘Veloudo’, cv. ‘Clemsson’ and cv. ‘Pylaias’, were sown in the field. The experimental treatments were three fertilizer levels (F1, F2 and F3), four harvest times (T1, T2, T3 and T4) and two sowing dates (S1 and S2). Results showed that there was significant difference for seed germination of the four cultivars, regardless of fertilizer level, and sowing date. The presence of hardseedness (% of hard seeds) was higher for cv. ‘Boyatiou’ and ‘Veloudo’ than cv. ‘Pylaias’ and ‘Clemson’, especially at 50 DAA (days after flowering), whereas for cv. ‘Boyatiou’ higher fertilizer levels (F2 and F3) reduced the % percent of hard seeds in sowing date S1. Regarding mean pod length there was significant effect of harvesting time, sowing date and fertilizer level, but no specific trend was observed. Mean weight of 100 seeds, was lower when delayed harvesting and F3 fertilizer level were applied, for both sowing dates. |
