Abstract
Paddy rice plent, the variety Norin No. 29 were grown under various nitrogen conditions and several aspects concerning the dry matter production were observed. From the experimental results following conclusion was derived. The relationships between dry matter productivity and the factors constituting CO2 Assimilation ability of rice plants growing under community conditions and respiration have studied. In general, the dry matter productivity of the rice community can be expressed as follows : ΔW=k·L·S·p0-Rw (k=constant) where, ΔW denotes the dry matter produced per day, L, integrated intesety, S leaf area, p0, mean photosynthetic activity per leaf area under saturating light intensity, ρ, light-receiving coefficient, Rw, consumed dry matter by respiration.
