Abstract
Japonica varieties showed higher increasing rate with increasing supply of nitrogen in soluble and fraction 1 protein contents, photosynthetic activity and ratio of photosynthesis to respiration than indica varieties, resulting in higher efficiency of dry matter production in the former than in the latter. The relatively high efficiency of japonica varieties favored reproductive growth phases, such as effective tiller percent, yielding capacity-number of spikelets and fertilization, rather than vegetative growth, such as plant weight and expansion of leaf area, and resulted in distributing more dry matter into grains. Indica varieties behaved adversely and the increase of their grain weight was relatively low.
