Meteorological Conditions for Floating Seedling Rearing of Tobacco in Solar Greenhouse
In order to understand the requirements of meteorological conditions in different growth stages of tobacco seedling bed,microclimate stations were set up in three sunlight greenhouses with different altitudes.Leaf age and physiological indexes of tobacco leaf were observed in combination with the sunshine and total radiation exposure data of tobacco leaf automatic weather stations outside the shed,and the requirements of temperature,humidity and light on seedlings at different altitudes were analyzed.The results showed that the ecological factors affecting the growth of seedlings in sunlight greenhouse were temperature＞water＞light.It takes 14-19 days from seeding to emergence,and about 4 days for each true leaf.The average temperature of the whole seedling period is 12.0-15.5℃,the relative humidity is controlled at 72.4％,the average temperature of nutrient solution is 11.0-15.1℃,and the accumulated temperature required for the seedling period is 555.1-640.8℃.The sunshine duration is 247.0-293.0 hours,and the total radiation exposure is 550.5-686.7MJ/m2.In this paper,temperature,humidity and light requirements of tobacco seedlings at different altitudes are studied and summarized,which provide theoretical support for meteorological services during the whole growth period of tobacco planting.
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