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In this paper, two kinds of fluorine-contaminate soils, fluvo-aquic soil and paddy soil, were cultivated by nitrogen fertilizer. Then, we studied the various fluorine species in the cultivated soil by sequential extraction method, and study the effect of main components in nitrogen fertilizer on pH of soils. After adding nitrogen fertilizer, the pH value of soil would increase, which consequently...
Snowfall is a general natural phenomenon in winter-spring alternate season in northeast of China. Snow was melt with the increase of temperature, i.e. freezing-thawing alternations affects soil properties. Static chamber technique was used to monitor nitrous oxide (N2O) flux from black soils in a snowfall process. The fertilization treatments are none (CK), 150 kg N ha-1 (N1), 300 kg N ha-1 (N2) and...
Sixty households were surveyed in Jingxian County, Hebei Province, and Xinxiang County, Henan Province, North China. Sampling of ground water from wells showed that nitrate contents were no more than 3 mg l-1. In contrast, water samples drawn from Huantai County, Shandong Province, and Wenxian County, Henan Province gave nitrate contents for five water samples over the EC standard, reaching 95 mg...
In order to tackle the problem of Cd pollution in paddy soils and investigate soil available Cd as affected by nitrogen fertilizers, incubation and pot experiments were carried out to study effects of different nitrogen fertilizers and rates of urea on cadmium uptake by paddy rice and soil available Cd under water flooding condition. Results revealed that soil pH increased sharply after the soil was...
In order to understand the effect of long-term fertilizer application on accumulation of cadmium (Cd) in Typic Purpli-Udic Cambosols and its crop, a research was carried out by a 15 years' long-term fix experiment in Chongqing, China. The results showed that Cd accumulated evidently in topsoil of 0-20cm, which content was in range of 1.6-2.7mg/kg and exceeded the third standard of national soil environmental...
Pot experiments were conducted to study the effects of 8 fertilizers (NH4Cl, NH4NO3, Ca(NO3)2, CO(NH2)2, Ca(H2PO4)2, KH2PO4, K2SO4 and KCl) on Ni uptake and distribution by rice. The results indicated that nitrogen and potassium fertilizers had little effect on the biomass and yield of rice, while the phosphate fertilizers significantly increased the biomass and yield of rice. The total amounts of...
Nitrous oxide (N2O) emissions from a typical vegetable cropping system in Wuhan, central China were measured from April 2007 to September 2008 on undisturbed soil monolith lysimeters using the closed chamber method. N2O emissions showed an immediate and pronounced increase to additions of N fertilizer. Peak N2O emissions were 42.5, 68.8, 548, 386 and 868 μg N m-2 h-1 in the N0, N1, N2, N3 and N4 treatments,...
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