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	1. Effects of By-product from Flue Gas Desulphurization on Sodic Soils Properties and Sunflower Growth
	Jinman Wang
	Agronomy 18 November 2008
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	Abstract:Because the main component of by-product from flue gas desulphurization（BFGD）is CaSO4, it can be used for improving sodic soils. Effects of BFGD on sodic soils properties and sunflower growth were studied in a pot experiment. The experiment consisted of eight treatments, four BFGD rates（0, 7.5, 15 and 22.5 t hm-2）and two leaching levels（750 and 1200 m3 hm-2）. Results indicated that the germination rate and yield of the sunflower increased, and Exchangeable Sodium Percentage（ESP），pH and Total Dissolved Salts（TDS）decreased by applying the by-product, while excessive BFGD also had effects on germination and growth of the sunflower and leaching could improve the efficiency. The physical and chemical properties of the soils reclaimed were best when the by-product was applied at 7.5 t hm-2 and water was irrigated at 1200 m3•hm-2, the soil pH, ESP, and TDS decreased from 9.2, 63.5 and 0.65% to 7.8, 2.8 and 0.06%, and the germination rate and yield of one sunflower reached 90% and 36.4g, respectively. Salinity should be controlled by leaching when sodic soil was reclaimed with BFGD because the growth of sunflower was very sensitive to salinity during its seeding stage.
	TO cite this article:Jinman Wang. Effects of By-product from Flue Gas Desulphurization on Sodic Soils Properties and Sunflower Growth[OL].[18 November 2008] http://en.paper.edu.cn/en_releasepaper/content/25825


	2. Effect of Soil Properties on growth and Nitrogenase Activity of Exotic Associative N-fixing Bacteria
	Riqing Zhu,Ping Fang,Guixiao La,Yajuan Li,Songlin Gao
	Agronomy 28 September 2008
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	Abstract:The competitive abilities of an exotic associated N-fixing bacteria strain (W12) with indigenous microbes in three soil samples were estimated using its rifampicin tolerant mutant (W12-R) based on the counts in the pure-culture and/or co-culture systems of the sterilized soil extracts. The reproduction of W12-R was significantly stressed by indigenous microbe in the co-culture systems of the all three soils, especially in the Honghe soil co-culture system due to its poor fertility. While the competitive stresses were abated at some extent after sucrose added in the co-culture systems, particularly in the Honghe soil co-culture system because of its lower indigenous microbial biomass. Furthermore, it was found that the nitrogenase activity of W12 in the co-cultured system decreased as the soil NH4+-N content or microbial biomass increased. While the nitrogenase activity of W12 was enhanced as soil TOC increased. The inoculating effects of W12 in 27 soil samples were evaluated according to the values of NAD, the difference between the nitrogenase activities detected in two soil culture systems inoculated with or without W12. Significant negative correlation between NAD and NH4+-N content (r = -0.554, P < 0.01) verified once again that higher NH4+-N content is a main nitrogenase inhibit factor in the soils. Positive inoculating effect of W12 could be obtained if soil NH4+-N content is less 10 mg kg-1, while could hardly observed when NH4+-N content exceed 60 mg kg-1. The significant negative correlations between nitrogenase activities of soil indigenous N-fixing bacteria or together with W12 and the soil Cd content were found, which implies that higher Cd content is one of the nitrogenase inhibitors to soil indigenous N-fixing microbe.
	TO cite this article:Riqing Zhu,Ping Fang,Guixiao La, et al. Effect of Soil Properties on growth and Nitrogenase Activity of Exotic Associative N-fixing Bacteria[OL].[28 September 2008] http://en.paper.edu.cn/en_releasepaper/content/24476

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