Papers by Keyword: Soil Types

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Authors: Xiao Fei Gao, Yang Yang, Zhen Long Liang, Juan Juan Zheng
Abstract: Three indophenol blue methods have been used to analyze ammounium-N in five typical soils in China. Method I and II, using the same catalyst of sodium nitroprusside but different quantity and types of reagents, are suggested by Soil Science Society of America (SSSA) and Soil Science Society of China (SSSC), respectively. Method III adopts acetone as the catalyst. It was shown that three methods yielded similar ammonium-N contents with each type of soil. But the use of sodium nitroprusside resulted in higher experimental sensitivity; and Method II by SSSC was recommended due to its lower cost.
Authors: Guang Fu Li, Chun Bo Huang, Hao Guo, Wu Yang
Abstract: Stress corrosion cracking (SCC) behaviors of pipeline steel X70 in various near-neutral pH soil environments with characteristics of eastern China have been studied through electrochemical measurements and slow strain rate tests (SSRT) at various electrode potentials in four solutions containing different typical soils in eastern China as well as in NS-4 solution. The SCC susceptibility in the four soil solutions was generally higher than that in NS-4 solution. There was a general trend that SCC susceptibility increased with decreasing the potential, suggesting that hydrogen induced cracking probably plays a key role in the cracking at least at low potentials and the parameters of cathodic protection in engineering should be carefully optimized to avoid SCC.
Authors: Li Yan, Hong Guang Cai, Zhi Dan Zhang, Qiang Gao, Wen Xi Lu, Guo Zhong Feng, Yuan Chen
Abstract: In the continuous Spring Maize system in Northeast China,the nitrate accumulation and succession characteristics of different soils and fertility in three locations with five fertilization treatments, which included no fertilizer treatment (CK), farmer conventional treatment (FC), recommendation fertilization (RF), control-released fertilizer (CRF) and single fertilization (SF), was compared by 6 years’ long-term experiment. The results showed that nitrate accumulation was drastically significant in high pH soils; potential nitrate increasing trend of high fertility soil was lower; new type fertilizer, for example controlled release fertilizer (CRF), and recommendation fertilizer rate (RF) could obviously decrease nitrate accumulation in single fertilization and in split fertilization; the nitrate excessive accumulation in soils could be improved by not only controlling fertilization, fertilizer and fertilizer rate, but also considering of soil types and soil fertility; and at present, in Northeast China, nitrate accumulation was in rational and safety level, but still exist potential risk.
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