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The balance of solar radiation and photosynthetically active radiation in rice plant community


, : The balance of solar radiation and photosynthetically active radiation in rice plant community. Research Reports of the Rural Development Administration (Suweon) 32(2 RICE): 55-63

Radiation balance within the canopy of two rice cultivars, Chucheongbyeo (japonica) and Samgangbyeo (Tongil type), was studied in terms of total solar radiation (TSR) and photosynthetically active radiation (PAR). Light transmission rate (LTR) decreased as an exponential function of leaf area index (LAI), where LTR was underestimated above LAI 5.0. Light extinction coefficients (k) of TSR were 0.382 within the canopy of Chucheongbyeo, and 0.318 of Samgangbyeo, while k of PAR were 0.516 of Chucheongbyeo and 0.499 of Samgangbyeo, respectively. The reflection ratio of PAR above rice canopy decreased from 9% at transplanting to 3% at later growth stage, while that of TSR increased to 20% as LAI increased. The reflectivity can be estimated from the exponential function of LAI, Y=re-(re-ro)EXP (-k.cntdot.LAI) without any significant differences between two cultivars. Light interception ratio was increased, as growth advanced, to 67% in TSR and 90% in PAR, respectively. The reflectivities of TSR were greater than those of PAR within all canopy strata of both cultivars. Light penetration rates were higher in Samgangbyeo than those in Chucheongbyeo at upper strata of the canopy, but were similar at about 40cm above ground, resulting in lower absorption rates of Samgangbyeo at upper canopy. Light extinction coefficients (k) of both TSR and PAR were larger in Chucheongbyeo than those in Samgangbyeo at all canopy strata, only except those of PAR at 40-60 cm stratum above ground.

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