Attempts were made to compare energy balance and moisture budget components of E-W rows of potato with those of N-S rows at partial cover during autumn of 1996. The energy balance and moisture budget components were considered for the soil, canopy and field, separately. Daily fluctuations of energy and moisture balance of field, soil and canopy were strongly influenced by row orientations. Larger portion of net radiation (Rn), both in E-W and N-S row fields, was partitioned to latent heat fluxes (LE). Average LE observed in E-W row potato field was lower than that of N-S potato field. Average ratios of -LE to Rn were found 0.95 and 0.97 for E-W and N-S rows, respectively. Sensible heat flux (H) was positive both in E-W and N-S rows. 16 to 17 % of Rn partitioned to soil heat flux (G) in E-W rows and 21 to 23% in N-S rows. Average soil net radiation (Rns) in N-S rows was about 19% larger than that of E-W rows. On average, latent heat flux density (LEs) was about 12% larger in N-S rows than that of E-W rows. Hs showed positive values in both the plots. The -G/Rns ratios was almost same in both the cases. The average canopy net radiation (Rnc) and latent heat flux from the canopy (LEc) of E-W row canopy was 26 and 20% larger than that of N-S row canopy, respectively. Hc showed negative values both for E-W and N-S row canopies.
Md. Abdul Baten , Begum Samsun Nahar , Hisashi kon and Nobuhiro Matsuoka , 2000. Moisture and Energy Balance Components as Influenced by Row Orientations of
Potato During Low Solar Elevation Angles . Pakistan Journal of Biological Sciences, 3: 1644-1647.