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1.高湿危害的症状表现 棚室内湿度偏高,不利于蔬菜的正常生长发育。高湿高温易使植株徒长,高湿低温又易诱发沤根,造成植株死亡。高湿时,非无滴棚膜内表面结露而密布水滴,降低棚膜的透光率,蔬菜植株表面也易形成露水或水珠,给蔬菜多种病害的发生及蔓延创造了条件。 2.引起棚室高湿的主要原因 (1)扣棚膜前,降雨雪过多,土地太湿,或棚室地下水位较高。 (2)棚室内灌水(畦灌或沟灌)量过大或灌水次数过多,放风不及时。
1. The symptoms of high humidity damage Indoor greenhouse humidity is high, is not conducive to the normal growth and development of vegetables. High temperature and humidity easily make the plant leggy, high humidity and easy to induce root, resulting in plant death. High humidity, the non-drip film condensation of the inner surface of the membrane and dense water droplets, reducing the transmittance of the greenhouse film, the surface of vegetables is also easy to form dew or water droplets, to the occurrence of vegetable diseases and the spread has created the conditions. 2. The main reason causing the greenhouse humidity (1) before the film, excessive rainfall, the land is too wet, or shed high groundwater level. (2) shed indoor irrigation (irrigation or furrow irrigation) is too large or excessive irrigation times, the wind is not timely.