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The model of relations of rice tillering to light and temperature conditions



The model of relations of rice tillering to light and temperature conditions



Acta Botanica Sinica 24(3): 247-251



A preliminary study was made for the model of the tillering growth and decline of the rice colonies, which was analytically estimated with the agroclimatic data of 1973-1979 in Shanghai suburbs [China]. The estimation is similar to the observed value. The model described is yz = ao+(af-ao)e .**GRAPHIC**. where yx represents the total number of rice stems in unit area when the accumulated temperature is x, which is accumulated by the effective temperature > 10.degree. C since the transplanting of the rice seedlings, ao is the basic seedling number in unit area, af is the total stem number in tillering peak, and c and d are experimental coefficients, which are calculated with experimental data. For the stem number of a single plant, the model is expressed by Yxo = 1 + (afo-1)e .**GRAPHIC**. The actual data were used to illustrate that the model is applicable not only to Japonica and Indica rice of all varieties but also to the description of the regional mean tillering state. When afo is unknown, it can be calculated with its associated light and temperature conditions.

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