Table of Content

10 March 1990, Volume 11 Issue 01

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Rice Computer Simulation Model (RICEMOD) and Its Applications Ⅳ THE OPTIMUM GROWING SEASON FOR RICE AND ITS CORRESPONDING PHOTOSYNTHETIC YIELD IN THE YANGTZE RIVER VALLEY

Huang Yao, Gao Liangzhi and Li Lin(Jiangsu Academy of Agricultural Sciences)

1990, 11(01):  16-21. 

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Based on the three principles related to the optimum growth season, i. e. , (1) matching with crops for rotation, (2) maximizing the yield and, (3) minimizing the endangerments, the authors computed the optimum growth seasons and their corresponding photosynthetic yields for 4 rico varietal types in the Yangtze River Valley, by using the established model, i. e. , the "rice clock" model for rice development, the models for estimating optimum leaf area index and the photosynthetic production.

STUDIES ON THE ROLE OF ICE NUCLEATION ACTIVE BACTERIA IN FROST INJURY TO MAIZE AND SOYBEAN

Liu Jianhua Tao Yufeng He Weixun Fen Yuxiang(Laboratory of Agrometeorology, Chinese Academy of Agricultural Sciences Beijing) Sun Fuzai Zhu Hong He Liyuan (Institute of plant protection, CAAS, Beijing)

1990, 11(01):  40549-405. 

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Two high-active strains of INA bacteria, IHM4(Erwinia herbicola) and ISSO1 (Pseuolomonas syringae), were tested for the role in frost injury to maize and soybean under both laboratorial simulation and natural conditions. Results demonstrated that the presence of INA bacteria was one of key factor in inducing frost damage to the two crops. The seedlings of 3-4 leaves treated by spraying with INA bacterial suspensions containing 5×10~3 cells per ml suffered frost injury at -2.5℃ to-3.0℃, whereas the untreated seedlings started to be obviously frozen at -6.0℃ to -7℃. The severity of frost injury increased with lower leaf temperature and higher concentration of INA bacterial populations. A linear relationship was found between the severity of frost injury (I) , leaf temperature (T) and logarithum of INA bacterial population (P):maize I=-92.4684-23.5655T+8.1622 logp soybean I=-96.80-27.28T+7.18 logp

Rice Computer Simulation Model (RICE MOD) and Its Application Ⅲ A DYNAMIC COMPUTER MODEL FOR SIMULATING PHOTOSYNTHETIC PRODUCTION OF RICE CANOPIES

Huang Yao, Gao Liangzhi and Jin Zhiqing(Jiangsu Academy of Agricultural Sciences)

1990, 11(01):  40831-408. 

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According to the basic principles of agrometeorology and physiology, the authors established a dynamic computer simulation model for simulating photosynthetic production of rice canopies, The model includes 3 submodels, i. e. , that of the dynamic leaf area, the photosynthesis and respiration, and the biomass accumulation and yield formation. By using the model, the dynamic process of rice photosynthetic production was simulated, and also a comparison was made between the simulated results and observed values.