Vergara - 1976 - Physiological and morphological adaptability of ri

210 CLIh-LATE AND RICE
hlANtJEL: Some factors of the environment may exert both direct and indirect (inductive or
remote) effects. Further. the indirect etfects can be tractionally= experienced and stored and.
later on, recalled by the plant.
‘vVere these accounted for by your mathematical equations?
ilfimakata: The effect of previous experience is taken into consideration to some extent in the
model type [V as mentioned in the last chapter of this paper. The model type IV is the reciprocal
equation made up trom many terms with respective climatic intbnnation of each stage. It" the
reciprocal equation were changed to the nonreciprocal type, this nonreciprocal equation has
interaction terms among climatic infonnation at dilTerent stages. The previous experience is
considered to be evaluated partially by these interaction tenns.
YAO: It is a fine piece of work. The equation on grain yield may be simplified by employing
some statistical methods such as analysis of wiriance. principal component analysis. etc.. to
remove those factors of secondary importance.
Jtlimalcata: At next chance. I would like to try the simplified model by statistical methods
presented by Dr. Yao.
IIDA‘. The apparent increase of tillers in both lower and higher temperatures may possibly be
due to hormonal disturbances. Suppressed plant elongation is usually accompanied by diminution
of apical dominance. which results in stimulated growth of lateral buds.