Abstract
To investigate varietal differences in dry matter productivity before the heading stage, several long culm and short culm varieties, the same used for the experiment in paper I, and several recently improved Japanese and Korean varieties were studied. Growth analysis of these varieties was conducted. The results obtained are summarized as follows: 1. Varieties with taller plant height and more productive tillers had a higher total dry matter weight at the heading stage when they had approximately the same heading date (Fig. 1 and Table 2). 2. The optimum leaf area index (LAIopt) showed a significant positive correlation with the total dry matter weight at the heading stage and the maximum crop growth rate (Fig. 4). Varieties with tall plant height and more productive tillers also showed higher LAIopt (Fig. 5).
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