科研之友
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摘要
Leaves are the main harvest of the flue-cured tobaccos, thus it was more meaningful to study the leaf area index of tobaccos than that of other crops, and because the great water consumption of tobaccos, it was also important to study the water-saving and precision irrigation, in this study, we integrate them by several simulation models, a simple method to estimate tobacco LAI and soil evaporation was exploited. We study it from a two-year experiment, and the experimental design of the two years was identical, the experiment of 2010 was used to develop the calculation system, and which of 2011 was applied to examine the accuracy of the calculation system, it was found that there was an exponential relationship between LAI and the days after transplanted, also between LAI and E-a/ET, the related simulation models was established based on the relationship, the correlation coefficient of which was above 0.9, showing a favorable simulation effect. Then the calculation system based on these models was developed, the data of 2011 was plug into the system for verification, results showed that the correlation coefficient (0.993, 0.869) of the estimated value and the measured value was in a high level, and relative error was in a satisfactory extent, demonstrating that the system could well estimate the LAI and the soil evaporation, and forecast their variation tendency. In consideration of the various impact factors (mainly the meteorological factors) of the soil evaporation, it was believed that the calculation system was more applicable in the greenhouse cultivation of flue-cured tobacco. The study conclusions can provide theoretical and practical basis for the precision irrigation and yield evaluation of flue-cured tobacco.
