漂浮系统热量状况及对烟苗素质的影响

Influence of Temperature Conditions of Float System on Quality of Flue-cured Tabacco Seedlings

漂浮系统的温度主要受膜外大气温度制约,地温对其影响程度相对较低,表现为膜内空气温度、水温、底膜下温度低于常规苗床的对应温度,但由于育苗材料的不同,漂浮系统床面温度却高于常规苗床,特别是苗期后段时间,床面温度上升速度明显加快。漂浮系统育苗表现出前期幼苗生长缓慢,后期生长速度明显加速,幼苗素质最终明显好于常规苗的特点。

The temperature of the float system depended mainly on air temperature of the atmosphere outside the plastic shed, while the earth temperature had less influence on it. The evidence was that inside the plastic shed the air temperature, water temperature and surface temperature under plastic film were lower than that outside plastic shed. The surface temperature of seedbed in the float system and the velocity of the temperature increasing were higher and faster than that in the conventional seedbed, especially in the late seedling stage. The growth of the flue-cured tobacco (Nicotiana tabacum L.) seedlings in the float system was slower in the early seedling stage, whereas the growth of the seedlings accelerated obviously in the late seedling stage. Therefore, the quality of the flue-cured tobacco seedlings in the float system was eventually better than that in the conventional seedbed.