Effect of Planting Ages on Soil Salts Content in Facility Cultivation Watermelon Soil

doi:10.11924/j.issn.1000-6850.casb18010002

Abstract

Abstract: To analyze the effects of watermelon planting years on changes of soil salts contents in facility cultivation watermelon soil, a field sampling in combination with analytical methods was carried out to measure the content and composition of soluble salts in soils with different facility cultivation planting ages. The results showed that soil pH value of facility cultivation watermelon soil significantly decreased compared with upland soil (P <0.05), while soil available nitrogen (AN), available phosphate (AP), available potassium (AK), andEC significantly increased (P <0.05). SoilEC was significantly increased with the increase of planting ages (R 2= 0.90，P <0.01). Ca2+ and Mg2+ were the major soluble salt cation, and SO42- and NO3- were the major soluble salt negative ions in facility cultivation watermelon soil. The content of soil total soluble salt were significantly increased with the increase of planting ages (R 2=0.93，P <0.01). The Ca2+, K+, NO3- and Cl- accounted for about 31.3%, 10.1%, 23.6% and 15.0% of the increased total soluble salt in soil. Correlation analysis indicated that soil available phosphate (P), available potassium (K) were important factor affecting the content of Na+ 、K+ 、SO42- and Mg2+. Soil electrical conductivity (EC ) could represent the level of soil secondary salinization.

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