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Effects of Water-fertilizer-salt Regulation Under Dripfertigation on Rapeseed Yield and the Water and Fertilizer Efficiency in Qinghai Province
Author(s): 
Pages: 18-23
Year: Issue:  4
Journal: Water Saving Irrigation

Keyword:  high-frequent irrigationsaline water irrigationsoil matric potentialirrigation water use efficiencypartial factor productivity from applied fertilizer;
Abstract: For the water and fertilizer management and secondary soil salinization prevention of rapeseed agriculture production under drip irrigation in Qinghai Province,a field experiment was conducted to research the effects of five fertigation proportion(the amount of fertilization were 10%,30%,50%,70% and 90% of local fertilization)treatments on the yield,and water and fertilizer efficiency of rapeseed.The soil matric potential at 0.2mdepth under the emitters was controlled above-20 kPa for water-fertilizer-salt regulation.The results showed that,in the alpine and arid areas of Qinghai when drip irrigation with saline water,the soil moisture,soil salinity and soil nutrients in the root zone(0~0.4mdepth)was good in high-frequent irrigation stage.However,when the fertigation stopped,the soil nutrients content reduced,surface soil salinity increased,while soil salinity in 0.3~1.2mdepth was maintained in a stable level.The high-frequency fertigation was beneficial to improve the rapeseed yield,water and fertilizer efficiency.The partial factor productivity from applied fertilizer and rapeseed yield was relatively high when the amount of fertilization was about50% of local fertilization.
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