Fig. 1. Sketch of administration divisions in Xi'an

Fig. 2. Effect chart of drought and flood assessment of two indexes

Fig. 3. Degree of drought and flood for corn in different phases

Fig. 4. Tendency of drought and flood for corn in sowing-emergence

Fig. 5. Tendency of drought and flood for corn in growth phase

Fig. 6. Forecasting of drought and flood by chaos method

Fig. 7. Tendency of relative production for corn

Fig. 8. Figure of production less rate anomaly

Fig. 9. Correlation of between relative production and drought flood degree in jointing-tasselling phase

Fig. 10. Correlation of between relative production and drought flood degree in jointing-tasselling phase by information diffusion