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10 September 1989, Volume 10 Issue 03

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Rice Computer Simulation Model (Ricemod) and Its Applications-Part 1——RICE CLOCK MODEL—A COMPUTER SIMULATION MODEL OF RICE DEVELOPMENT

Gao Liangzhi Jin Zhiqing Huang Yao Zhang Lizhong (Jiangsu Academy of Agricultural Scicuces)

1989, 10(03):  40612-406. 

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The "rice clock". model presented in this paper is dynamic application-oriented simulation model of rice development. It consists of two submodels, i. e. , growth duration model and leaf age model. The former is used simulate the effect of daily temperature and day-length on rice development, with a higher precision and a better explanatory capacity. The parameters of the growth model reflect the basic vegetative duration, thermo-and photo-period-sensitivities for different varietal types. The latter is used to simulate the effect of daily temperature on leaf development. It can estimate the appearance of each leaf blade with different age, and also describe the development and formation of various morphological organs (such as tiller, stem, root and panicle) due to their good synchronizations of growth with leaf development, these two models could be connected well to estimate the number of fully developped leaves in any region and year. Finally, these two modelswere tested and evaluated, based on the experiment data collected from 14 locations (1985), and 8 locations (1986) in the Yangzi River Valley, China,

The Relationships Between Temperature And Crop Growth And Their Dynamic Variation

Wang Sinli, Department of Forestry, Nanjing Forestry University

1989, 10(03):  40862-408. 

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Based on the idea that the crop growth rate will decrease when environmental temperature is below or high above its optimal value and that if the decreases are not distinct the temperature is considered suitable for the crop growth, a mathematic model is proposed to evaluate the range of suitable temperature:And a similar mathematic model is developped for evaluating the indices of high and low injured temperatures to the crop growth. By the computations with the models it is poited out that in the growth period of the long -grained nonglutinous (indica) hybridized rice (No. 6) the optimal temperatures vary in the course of low-high-low pattern, and the indices of the high and low injured temperatures tend to the similar variation pattern. The range of suitable temperatures takes the course of big-small-big. It is obvious that the crop growth is sensitive to environmental temperature during the period of 11th leaf to boot stage. It is recognized by further analysis that the above regulations are identical to the courses of the crop growth rate and leaf area index of the colony, by which it is demonstrated that the regulations reflect the biochemical procedure variations in the plant body and the course of the colony architecture during its all life.