Relative efficacy of natural resource use in Gobhi Sarson (Brassica napus) in Himachal Pradesh, India
Abstract
An experiment was conducted during Rabi 2010-11 to 2014-15 with an objective to quantify natural resource use by
gobhi sarson in terms of heat use efficiency, radiation use efficiency and water use efficiency to facilitate the identification
of varieties suitable for different sowing environments. In all the five varieties of gobhi sarson viz., GSL-1, ONK-1, HPN-
1, HPN-3 and Hyola-401 (hybrid) sown on 20th Oct, 30th Oct and 10th Nov, it was observed that the days taken for
completion of different phenological stages and their thermal units requirements from 90% siliquae filling to physiological
maturity decreased with successive delay in sowing. The efficiency to use these resources vis-a-vis seed yield also
decreased with delay in sowing.Water use efficiency was observed to be higher (3.0 to 5.3 kg/ha/mm) as compared to
heat use efficiency (0.8 to 1.3 kg/ha/degreeday) and radiation use efficiency (0.5 to 0.8 kg/ha/MJ).The seed yield
deceased with delay in sowing from 20th October (2.43 to 1.71 t/ha) to 10th November (1.79 to1.32 t/ha). The variety ONK-
1, when sown on 20th and 30th October was found to be more efficient in respect of heat use (1.5 kg/ha/degree day) and
water use (5.3 kg/ha/mm) as compared to other varieties studied.
gobhi sarson in terms of heat use efficiency, radiation use efficiency and water use efficiency to facilitate the identification
of varieties suitable for different sowing environments. In all the five varieties of gobhi sarson viz., GSL-1, ONK-1, HPN-
1, HPN-3 and Hyola-401 (hybrid) sown on 20th Oct, 30th Oct and 10th Nov, it was observed that the days taken for
completion of different phenological stages and their thermal units requirements from 90% siliquae filling to physiological
maturity decreased with successive delay in sowing. The efficiency to use these resources vis-a-vis seed yield also
decreased with delay in sowing.Water use efficiency was observed to be higher (3.0 to 5.3 kg/ha/mm) as compared to
heat use efficiency (0.8 to 1.3 kg/ha/degreeday) and radiation use efficiency (0.5 to 0.8 kg/ha/MJ).The seed yield
deceased with delay in sowing from 20th October (2.43 to 1.71 t/ha) to 10th November (1.79 to1.32 t/ha). The variety ONK-
1, when sown on 20th and 30th October was found to be more efficient in respect of heat use (1.5 kg/ha/degree day) and
water use (5.3 kg/ha/mm) as compared to other varieties studied.
Keywords
Gobhi sarson, growing degree days (GDD), phenology, resource use efficiency, sowing dates
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