低温冷害:这是塑料大棚保护地生产最为突出的一个问题。低温冷害在作物上的主要表现,一是因光合作用和根系吸收作用减弱而使植株变得瘦小,叶片小,茎细节间短,根系不发达;二是因植株异化大于同化,物质消耗多于积累,使花器不能正常形成和生长,造成畸形果:三是因代谢机能下降,吸收水分减弱,蒸腾作用并不减弱,使植株失水萎蔫;四是因同化产物运转速度慢,使其停留在叶片中,造 Chilling damage: This is the most prominent issue in the production of plastic greenhouse protection. Chilling injury in crops on the main performance, first, due to photosynthesis and root absorption weakened the plants become thin, small leaves, short stems between the details, the root system is underdeveloped; second is due to plant alienation than the assimilation, material consumption more than Accumulation, the flowers can not be formed and grow normally, resulting in abnormal fruit: Third, due to the decline of metabolic function, absorption of water decreased, transpiration does not weaken, so that plant wilting loss of water; Fourth, because the assimilation product runs slowly, In the leaves, made