Diurnal variation of radiation components at three major phenological stages of Boro and Kharif rice under different management practices in West Bengal
DOI:
https://doi.org/10.54386/jam.v27i2.2774Keywords:
Diurnal variation, Photosynthetically active radiation (PAR), Albedo, APAR, IPAR, Boro and Kharif seasonsAbstract
Present study quantifies and compares the diurnal variation of four components of PAR (APAR, IPAR, crop and soil albedo) and net radiation across three key phenological stages for Boro and Kharif rice under different management practices. Two consecutive field experiments were conducted during 2018 and 2019 at the D Block farm of Bidhan Chandra Krishi Viswavidyalaya, considering 18 treatment combinations of three rice varieties, three spacing and two seedling ages. Weekly observations were taken six times in a day with two hours interval. Results indicated that the maximum values of IPAR (93.53% and 82.62%) were recorded in Triguna variety and minimum value (90.02% and 78.62%) in Heera variety during the reproductive and vegetative stage at 11:30 AM and 5:30 PM respectively in Boro season but it reduced by 7-8% in the Kharif season indicating the influence of cloudy weather. Boro rice consumes the maximum amount of net radiation (689.32 W/m2) in reproductive stage followed by 649.22 W m-2 in vegetative and 549.22 W m-2 in ripening stages for Triguna variety whereas Heera consumes lesser amount (489.23 to 600.22 W m-2), which is significantly lesser in Kharif season. The study concluded that components of PAR and net radiation vary significantly across phenological stages, spacing and varieties while the ages of seedling (only 7 days difference) remain relatively unaffected.
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