Effects On Yield And Soil Water-Saline Enviromental Of The Cotton In Saline Water Irrigation Under-Film Drip

Water resources is the indispensable natural resources for human survival and development. With the development of domestic economy, the shortage of water resources used in irrigation has been an important restraint factor in arid and semiarid areas. The utilization of saline water is a effective way of easing up the problem of water resources shortage. The under-film drip irrigation has gained widespread popularity as an efficient and economically viable irrigation method for increasing water use efficiency and reducing the adverse effects of salinity on plant growth and yield. Saline water irrigation effects were studied in a field experiment for two growing seasons with the aim of clarifying (1) characters of salt distribution and accumulation under surface drip irrigation in arid region; (2) Saline water irrigation effects on the aboveground growth and yield of cotton.The main results and conclusions were listed as follows: Soil salinity increased with increased irrigation water salinity levels in under-film drip irrigation conditions. Soil salt built up at top 0-10 cm in surface drip irrigation The average soil salinity in soil profile was increased with increased irrigation water salinity levels. Those results suggested that salt accumulation increased significantly with saline water irrigation applied in arid region. Depending on water salinity, irrigation scheduling and seasonal salt load, salt can accumulate in the soil profile. The secondary saline leaching and drainage is necessary for maintaining agricultural production.The aboveground growth and yield of cotton were not influenced by saline water in 2004, but the aboveground dry weight and yield of cotton decreased significantly with increased irrigation water salinity levels in 2005. Continuous saline water irrigation reduced number of bolls significantly and had a slight effect on boll weight. Ions absorption mainly affected by soil salinity and built up in leaves and stem, especially in leaves. Concentrations of salt ions in leaves were extreme higher than those in other plant parts.