Author(s):

A Ghosh and SA Khan

Abstract: A field experiment was carried out to determine radiation use efficiency (RUE) of grass pea at Instructional Farm, Bidhan Chandra Krishi Viswavidyalaya, West Bengal during rabi season of 2016-2017. Grass pea (Variety: ‘Prateek’) was sown on nine different dates from 26^th October to 21^st December at weekly interval. Sun shine hours accumulated during pre-flowering, post-flowering phases and entire growing period was calculated. Solar radiation accumulated during the growing period of the crop was computed by using SSH values. Dry matter yields (biological yield excluding grain yield) was recorded and statistically analyzed. Radiation use efficiency (RUE) was calculated. 26^th October sown crop experienced highest solar radiation (2948.86mjm-2) and lowest solar radiation (2341.67mjm-2) was experienced by the crop sown on 21^st December. The crops sown on 16^th November produced maximum dry matter (3838.5kg/ha) while lowest dry matter (1903.1kg/ha) was obtained from 21^st December sown crop. RUE value was the highest (1.451) in 16^th November sown crop and lowest (0.813) in 21^st December sown crop.

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