Abstract: Planting arrangements showed significant influence on microclimate of a crop. Soil surface temperature between two rows was found higher over the mulched surface than that of open soil in all the treatments. With the decrease in row-spacing the soil surface temperature was found to decrease. The highest soil temperature was observed in 45 cm row spacing and lowest in 5 cm row spacing. The higher soil temperature (28 °C) was observed in bare plots than that of mulched ones (23 °C ) at 1500 hr. Air near the soil surface (at 5 cm height) received sensible heat from the dry soil surface and showed high temperature than the mulched plots. In 5 cm row spacing, due to the higher canopy area relative humidity was found to increase through higher level of transpiration than that of wider row spacing. Canopy temperature was found to be increased with the decrease in row spacing. Penetration of solar radiation, net radiation and PAR were higher at wider row spacing. With the increase in canopy height, penetration of radiation increased. Maximum net radiation was obtained at midday and it was decreasing with the advancement of day. Data of 1500 hr show positive but small value of net radiation at 45 cm row spacing and negative at 25 cm and 5 cm row spacings. The negative trend of net radiation from small row spacings was due to higher out going long wave radiation from shade surface at late hours of the day.