title: [Effect of exogenous selenium on soybean yield and its total N and P contents and on soil enzyme activities].
abstract: Based on pot experiment with black soil, the effects of various concentrations and various valence of exogenous selenium on soybean yield and its N and P contents and on soil enzyme activities were studied. The results showed that applying 0.25 microgram.g-1 soil and 0.5 microgram.g-1 soil of both Se4+ and Se6+ could increase soybean yield and its N content and promote soil urease activity, but decrease the P content of soybean and soil phosphatase activity. When the concentration of Se6+ was 0.5 microgram.g-1 soil, there was a significantly parabola relationship between the N content of soybean and soil urease activity; and when the concentration of Se6+ was 0.25 microgram.g-1 soil, there was a significantly parabola relationship between the P content of soybean and soil phosphatase activity. There were no significant relationships between the N and P contents of soybean and the activities of test soil enzymes when Se4+ was applied.
authors.affiliation: Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China. dghsir@163.net
authors.forename: Guanghui
authors.initials: G
authors.lastname: Dong
authors.forename: Lijun
authors.initials: L
authors.lastname: Chen
authors.forename: Zhijie
authors.initials: Z
authors.lastname: Wu
authors.forename: Shisheng
authors.initials: S
authors.lastname: Xiao
authors.forename: Li
authors.initials: L
authors.lastname: Chen
authors.forename: Enchun
authors.initials: E
authors.lastname: Lei
mesh_terms: D018556:Crops, Agricultural / Q000254:growth & development*; D009584:Nitrogen / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis*; D012643:Selenium / Q000494:pharmacology*; D012987:Soil / Q000032:analysis*; D013025:Glycine max / Q000737:chemistry / Q000254:growth & development*; D014510:Urease / Q000378:metabolism
chemical_list: D012987:Soil; D010758:Phosphorus; D014510:Urease; D012643:Selenium; D009584:Nitrogen