Effects of sea ice water irrigation and different fertilizations on soil salinality dynamics and cotton

In order to investigate the agronomic measures of irrigation by sea-ice water, amending the wasteland and alkaline arable land, the present study was for the purpose of investigating the effects of amelioration measures on soil salt dynamics and cotton yield under sea ice water irrigation. Four amelioration measures were inorganic fertilizer, inorganic + organic fertilizers, inorganic fertilizer + soil conditioner, and control (no fertilizer). The results showed that: (1) from 2007 to 2008, the soil salt in 1 m soil profile decreased with sea ice water irrigation. The soil desalting efficiency was about 40.2%. Na+ and Cl- in 0–40 soil layer were significantly decreased too; (2) the soil desalting efficiency in 1 m soil profile with sea ice water irrigation and PAM was 33820 kg/hm2 higher than that without PAM. The desalting efficiencies for Na+ and Cl- in the plow layers with PAM were also significant. (3) 2007–2008, cotton yield with different fertilization methods under irrigation with sea ice water were CK (no fertilizer)＜inorganic fertilizers＜inorganic + organic fertilizers＜inorganic fertilizers + soil conditioner fertilizer. Inorganic fertilizers + soil conditioner fertilizer was ca. 568 kg/hm2 higher than inorganic fertilizers in yield of cotton. Continued irrigation with sea ice water in two years could effectively reduce soil salt and avoid secondary salinization.