Effects of Sulfur Fertilization on Soil Salinity,pH,and the Yield and Quality of Kirin Watermelon in Saline-alkali Land
To investigate the ameliorative effects of sulfur fertilization on saline-alkali land,a field experiment was conducted to study its impact on soil salinity,pH,and the growth,yield,and quality of Kirin watermelon.The results show that sulfur application at the rate of 150 kg·hm-2 reduced soil salinity by 7.79%to 30.73%and soil pH by 1.34%to 4.29%,compared to the untreated soil.Sulfur fertilization increased the main vine length,stem diameter,SPAD value and leaf area of Kirin watermelon,with the 150 kg·hm-2 treatment showing the most significant effects,which were 32.80%,15.84%,7.78%,and 32.78%higher at maturity than the non-fertilized treatment,respectively.Sulfur application also improved the net photosynthetic rate,transpiration rate,and stomatal conductance of the leaves,while decreasing the intercellular CO2 concentration.The treatment with150 kg·hm-2 of sulfur significantly enhanced the content of soluble solids,soluble sugars,sugar-acid ratio,vitamin C and lycopene in Kirin watermelon.The yields of watermelon for the 75 kg·hm-2 and 150 kg·hm-2 sulfur treatments were 55.56 t·hm-2 and 58.02 t·hm-2,respectively,which increased by 4.14%and 6.32%over the control.It is evident that sulfur fertilization can reduce soil salinity and pH value in saline-alkali land within a certain range,and promote the growth of Kirin watermelon,significantly improving its yield and quality.
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