According to the conventional meteorolog observation data and the water surface evaporation of 20m 2 experimental pool in Changji, it analysed the effective degree of different meteorological factors on the water surface evaporation, and obtained the conversion coefficient of water surface evaporation of E 601 and 20 Evaporation implements, set up the experience formula of calculating the water surface evaporation.
The regression analysis of water consumption of greenhouse pepper and the water surface evaporation revealed that even in different irrigation modes did the water consuming models of greenhouse pepper using water surface evaporation as its reference had very good correlativity, especially in irrigation without mulching film in which the correlation coefficient was 0.834.
Water surface evaporation capacity of reservoir or lake can't be directly observed and should be computed with such methods as instrument-measurement method, water balance method, as well as experience model set up from energy balance and dynamics method.
Statistical analyses on the long series of water surface evaporation data of multi stations in Poyang Lake indicate that the water surface evaporation capacity is gradually decreasing in the latest 40 years.
The water-surface evaporating capacity is an important index in the water balance calculation, and it is very important to analyze its space-time distribution and features for evaluating and planning the regional water resourc es.
Using the water-balance method, the authors studied the water consumption of tomato (Lycopersicon esculentum Mill.) and the relationship between evapotranspiration and water surface evaporation measured with 20?cm pan.
The accumulative value of evapotranspiration is approximately equal to the accumulative value of water surface evaporation measured using 20?cm pan.
Evaporation may be approximated using the mean monthly pan evaporation or free water surface evaporation data.
It was also established that there was a corresponding increase in open water surface evaporation during this period.