Table of Content

10 December 1993, Volume 14 Issue 06

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A Macroscopic Dynamic Simulating Model on Climate Productivity of Winter Wheat

Liu Duhui (The information Center for Agricultural Remote Sensing, Shaanxi Province, XI'AN) Li Dengke Liu Yaowu (Xianyang Agrometeorological Institure of Shaanxi Province, XIANYANG)

1993, 14(06):  16-20. 

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Accroding to the close relationships between photosynthesis character of crop colony and climatic ecological environment, the climatic productivity of crop may be divided into two parts including the'potential term' and the 'Iimiting term'. The'potential term' means the crop productive level and its variance determined by macroscopic climatic conditions, but the'Iimiting term' means limiting factors from risk or restriction of ecological conditions. Therefore, a new structure of simulation model to estimate both the potential and limiting term of macroscopic climatic productivity of winter wheat was established successfully based on the field experiment data from 1985 to 1989 (Guanzhong Plain, Shaanxi Province). The simulating yields is very similar to actual yields, the mean relative error is less 5% , the simulation results show a new approach of forecasting crop yield and suitablity to operational system.

THE CLIMATIC EVALUATION OF NINGXIA PROVINCE S RICE QUALITY

Zhang Songwu (Northwestern Agricultural University)

1993, 14(06):  40547-405. 

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Rice quality is affected greatly by climatic conditions. The climatic indices of rice quality affecting rice quality were showed and it was explained that there are excellent climatic conditions producing good quality rice in Ningxia Plain in the paper.