Abstract: Meteorological suitability evaluation on spraying pesticide/fertilizer in wheat fields is of great significance for scientific agricultural operations. In the Huaibei Plain in Anhui Province, the main meteorological factors affecting pesticide/fertilizerspraying operations in wheat fields are precipitation, air temperature, wind velocity and soil moisture. According to the experience indexes regarding the influences of climate and soil conditions on spraying operation, we established four cloud models based on the theory of cloud model. By adopting the method of AHP, we also integrated the memberships of four factors, obtaining the comprehensive meteorological suitability that affects pesticide/fertilizerspraying operation. Moreover, to evaluate relative meteorological suitability, an evaluation cloud model including four grades―suitable, fairly suitable, slightly unsuitable and unsuitable―was established. The test results are in conformity with actual situation, indicating that the evaluation model can be applied in meteorological suitability evaluation of spraying operations. Based on the forecast of precipitation, wind velocity and other meteorological factors, the evaluation model can be used for grade forecast of meteorological suitability in pesticide/fertilizerspraying operations.

Key words: variability, sensitivity analysis, Bartels statistics, Hurst coefficient, Lancang River.