Effects of different drip irrigation regimes on saline–sodic soil nutrients and cotton yield in an arid region of Northwest China

摘要: A field experiment was conducted on a saline wasteland in Xinjiang, Northwest China, during 2008-2010 to evaluate the nutrient behavior and cotton yield reclamation, applied by different drip irrigation regimes. The included five treatments which soil matric potential (SMP) thresholds at 20 cm depth were controlled 5, 10, 15, 25 kPa. results indicated that both salinity sodicity declined significantly 0-40 greater reductions achieved higher SMP (-5 10 kPa) than other treatments. distributions inorganic nitrogen (N) available phosphorus (P) potassium (K) profile mainly influenced point-source characteristic of irrigation, regime fertilization mode. With reclamation chemical physical properties, there dramatic increases N, P K concentration end 2010. concentrations all proportional thresholds, as could result sodicity. Since crop growth became more vigorous also considerable increase (9.7-31.9%) organic carbon 2010, thresholds. highest obtained Si treatment for 2009 (2.87 Mg ha(-1)) 2010 (3.60 ha(-1)). Additionally, C:N ratios inversely Considering efficiency, stocks yield, 5 kPa be used effective measures trigger first 3 years saline-sodic China. (C) 2015 Elsevier B.V. All rights reserved.