Estimation of daytime net radiation above corn canopy
1988
Lee, Y.S. (Rural Development Administration, Suwon (Korea R.). Agricultural Sciences Inst.) | Jeong, Y.S. (Kangwon National Univ., Chunchon (Korea R.). Coll. of Agriculture)
Field study was conducted to evaluate the relationship between daytime net radiation (Drn) and global solar radiation (Rs) and to develop the empirical equation predicting daytime net radiation above corn canopy from observations of Rs and Ta (mean daily air temperature). The relationship between Drn and Rs under the cloudless day was Drn= 0.6659Rs and that under the cloudy (35% of possible sunshine) Drn= 0.729Rs. Thus, Drn/Rs ratio under cloudless day was found to be lower than that under the cloudy day. Rs and Ta were used in the radiation balance equation to estimate Drn and the empirical model could be expressed as Drn= [0.9 Rs-(352-227 x 10** (-10) x Ta** (4))] [1.11Rs/Rso-0.05]
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