Effects of different sea-ice water irrigation on soil moisture and cotton growth

A field experiment was conducted on Zhongjie Farm in Huanghua to research soil moisture change after irrigation,effect of water use efficiency and biological characteristics of cotton under a different amount of irrigation of 3‰ salinity sea-ice.The results showed that sea-ice water irrigation could improve moisture content of topsoil significantly,and the higher irrigation amount the greater soil moisture content in 0～100 cm soil layers;Irrigation before sowing with sea-ice could ease the drought in coastal saline soil of the Bohai coastal region and it is conducive to leaching of soil salinity.So it was an effective measure of solving drought problems and improving rate of seedling emergence.Different amounts of sea-ice water irrigation significantly affect the biological characteristics of cotton and soil water use efficiency.The cotton plant height,fruit branch number,boll number,the seed cotton yield and soil water use efficiency were significantly increasing with the irrigation of sea-ice irrigation.And they all reached the maximum by the irrigation amount of 525 m3/hm2,but later decreased with increased irrigation.By all the knowable research above,the result that when using cotton 3 ‰ sea-ice water for irrigation,the irrigation amount should be 525 m3/hm2 was suggested in this paper.