Abstract: Data of microclimate of the paddy field recorded by a micrometeorologi- cal data logger system was analyzed intensively and the microclimatic chara- cters during late rice grain filling period was discussed in detail.Data showed that the quanta value in erect-leaf cultivar was almost as much as two times comparing the one with horizontal-leaf in 15 centimeters height inside the canopy;difference of temperature recored in the surface of plant and leaf between two cultivars inside the canopy was negligible;relative humidity was also recorded at the 1.5 meter height.Experimental data indicated the better utilization of solar energy was the most important factor for contributing higher yielding potential in erect-leaf cultivars.Aside from this,reliability for using this micrometeorological data logger system was also verified.

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