渤海海冰盐度一般在4~11 g/kg之间,经处理可以作为农业灌溉用水。采用不同盐度(1、3、5 g/kg),不同灌溉水量(4509、00、1 350 m3/hm2)的海冰水进行农田微区试验。结果表明:(1)灌溉处理的试验终期的土壤盐度没有显著的增加,在降水的淋溶下可以保持在较低水平;在第二年返盐高峰时土壤盐分也保持在较低水平。(2)玉米籽粒产量随灌溉海冰水的盐度增加而轻微下降,在低盐度(1 g/kg)的处理时,随灌溉水量的增加而增加,在高盐度(3、5 g/kg)时则相反。玉米秆的产量也呈现出和籽粒相似的规律。
The salinity of Bohai sea ice is usually 4 to 11 g/kg and sea ice can be used for irrigation after desalination.Farmland experiment was carried out with different irrigation water salinity(1 g/kg,3 g/kg and 5 g/kg) and different irrigation water quantity(450 m3/hm2,900 m3/hm2,1 350 m3/hm2).The results showed that(1) At the end of the experiment,the soil salinity of 10 disposals didn't increase remarkably on account of the washing and leaching of precipitation;and the soil salinity was also maintained at a lower level in the second year of salt return peak.(2) The corn yield dropped lightly with the increasing of the irrigation salinity.When the irrigation water salinity was 1 g/kg,the corn yield would increase along with the increasing irrigation water quantity.When the irrigation water salinity was 3 g/kg or 5 g/kg,the corn yield would decrease along with the increasing irrigation water quantity.The corn stalk yet showed the similar law.