Abstract
A field experiment was conducted at the research field of Agronomy Division, BARI, Joydebpur, Gazipur during rabi season of 2015-16 to evaluate the flowering behavior and seed yield of French bean. Three varieties viz., BARI Jharsheem-1, BARI Jharsheem-2 and BARI Jharsheem-3 were sown at 15 November, 30 November, 15 December and 30 December for getting temperature variation. Sowing dates based temperature variation, significantly affect the flowering behaviour and seed yield of French bean varieties. Flowering duration of 15 November and 30 November sowings were longer due to prevailing low temperatures (Min.11.72-13.240C and Max. 25.02-25.820C). On the contrary, minimum flowering duration was recorded in 30 December sown crop (11-17 days). Minimum duration might be due to prevailing high temperature (Min. 16.05-18.610C and Max. 28.89-31.310C) that shorten the flowering duration of all French bean varieties. November sowing performed better in relation to yield components and seed yield than other sowing. BARI Jharsheem-1 produced the maximum seed yield (1734 kg ha-1) in 15 November which was statistically similar to 30 November sowing (1620 kg ha-1). The lowest seed yield (421 kg ha-1) was produced in BARI Jharsheem -2 from 30 December sowing. The highest seed yield was obtained from November sowing might be due to favourable optimum temperature for better flowering and pod setting that resulted in maximum seed.SAARC J. Agri., 15(1): 77-84 (2017)
Highlights
French bean (Phaseolus vulgaris L.) is cultivated in Bangladesh as green bean as well as dry seeds
Crop developmental events and growth duration were influenced by prevailing temperature variations (Table 1)
Crop growth duration was recorded maximum in Bangladesh Agricultural Research Institute (BARI) Jharsheem-2 sown on 15 November (107 days) followed by 30 November sowing (104 days)
Summary
French bean (Phaseolus vulgaris L.) is cultivated in Bangladesh as green bean as well as dry seeds. Late sowing is one of the major causes of low yield of French bean. Aman harvest than the crop faces unfavorable weather conditions at its reproductive phase and gave low yield. Sowing at proper time allows sufficient growth and development of a crop to obtain a satisfactory yield because high temperature is one of the major environmental stresses that affect plant growth and development (Boyer, 1982). High temperature stress causes substantial loss in crop yield due to damage of reproductive organs (Savin and Nicolas, 1996) and reduced length of reproductive period. The present experiment was conducted to evaluate the flowering pattern and seed yield under different temperature variation from different sowing time
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