AS  Vol.8 No.5 , May 2017
Contents and Changes of Potassium in Plough Layers of Xuancheng, South Anhui Province
Abstract: Xuancheng City is the dominant tobacco-planting area of Anhui province due to the high quality of the tobacco leaves. However, the potassium content in the tobacco leaves shows a gradual decreasing trend in recent years, which may be attributed partly to the possible low potassium content in topsoil of tobacco-planting farmland. Therefore, the content data in the year of 2005-2007 of rapidly available potassium (RA-K) of 7730 topsoil samples mainly under double rice rotation or wheat/rice-rice rotation at that time and the content data of slowly available potassium (SA-K) and RA-K of 124 typical topsoil samples in the year of 2015 under tobacco-rice rotation were used and compared in order to disclose the status of topsoil potassium and to provide a guidance for reasonable potassium fertilization in Xuancheng. The results showed that in 2005-2007 RA-K content ranged from 1 mg&#183kg-1 to 844 mg&#183kg-1 with an average of 68 mg&#183kg-1, and 82.7% of topsoil samples were insufficient in RA-K (<100 mg&#183kg-1). Comparatively in 2015 SA-K content ranged from 230 mg&#183kg-1 to 1340 mg&#183kg-1 with an average of 595 mg&#183kg-1, and 13.7% of soil samples were insufficient in SA-K (<400 mg&#183kg-1); RA-K content ranged from 46 mg&#183kg-1 to 352 mg&#183kg-1 with an average of 134 mg&#183kg-1, and 25.8% of soil samples were insufficient in RA-K (<100 mg&#183kg-1). The above data show that RA-K content has increased gradually in farmland topsoil mainly due to fertilization since 1980s, particularly to farmland under tobacco-rice rotation, but insufficient RA-K in topsoil is still widely and serious for farmland under double rice rotation or wheat/rice-rice rotation. Under tobacco-rice rotation, RA-K insufficiency usually occurred in the farmlands which plant tobacco less than 3 years, indicating more potassium fertilizer should be applied.
Cite this paper: Lin, K. , Li, D. , Song, X. , Zu, C. , Jiang, C. , Shen, J. , Ma, C. , Gao, Q. , Zhu, Q. , Ji, X. , Zhang, G. and Xue, L. (2017) Contents and Changes of Potassium in Plough Layers of Xuancheng, South Anhui Province. Agricultural Sciences, 8, 348-355. doi: 10.4236/as.2017.85026.

[1]   Gething, P.A. (1993) Potassium Fertilization Technology of Main Crops. Beijing Agricultural University Press, Beijing.

[2]   Hu, D.J., Dong, C.R. and Ge, D.Z. (1993) Theory and Practice of Plant Potassium Nutrition. Hunan Science and Technology Press, Changsha.

[3]   Marchand, M., Etourneaud, F. and Bourrie, B. (1997) The Effect of Different Varieties of Potash Fertilizer on Tobacco Yield and Chemical Composition. Chinese Tobacco Science, 2, 6-11.

[4]   Hu, G.S., Zhao, Y.K., Cao, Z.H., Zhao, X., Zhao, Z.S., Chen, J.H., Zhang, X., Zhou, X.R. and Li, Z.L. (1997) The Evaluation of The Chemical Elements and Some Organic Components in Flue-Cured Leaf Tobacco from The Main Tobacco Production Provinces of China. Acta Tabacaria Sinica, 3, 36-43.

[5]   Wang, Y.T., Xie, J.P. and Li, Z.H. (2010) Tobacco Planting Regionalization of China. Science Press, Beijing.

[6]   Zu, C.L., Ji, X.J., Ma, C.X., Yang, C., Liu, G.S. and Qiu, L.Y. (2010) Relationship Between Mineral Elements in Flue-Cured Tobacco Leaves, Cultivated Soils and Burnt-Sweet Smelling Formation in South Anhui. Soils, 42, 26-32.

[7]   Wannan Tobacco Co. Ltd. (2010) Exploration and Practice of Modern Tobacco Agriculture. Hefei University of Technology Press, Hefei.

[8]   Xi, J.F., Li, X.S., Wang, D.Z., Ji, X.J., Shen, S.D., Yang, P., Zhou, L.X. and Li, D.C. (2009) On Soil Suitability for Burnt-Sweet Smelling Distinctive Tobacco Growth in Xuancheng. Soils, 41, 1018-1020.

[9]   Ji, X.J., Wang, D.Z., Shen, S.D., Xi, J.F., Li, D.C., Li, X.S., Yang, P. and Zhou, L.X. (2010) Quantitative Evaluation on Suitable Potential for Distinctive Tobacco Growth in Xuancheng. Soils, 42, 648-651.

[10]   Zhang, G., Ji, X.J., Li, D.C., Wang, D.Z., Shen, S.D. and Xiang, Z.H. (2012) On Quantitative Evaluation and Spatial Distribution of Major Properties for Tobacco Soil in Xuancheng City of Anhui Province. Soils, 44, 873-879.

[11]   Ji, X.J., Shen, S.D., Xue, L., Zhang, G., Zhuang, Y., Wu, X.J., Li, D.C. and Zu, C.L. (2013) Soil Taxonomy of Typical Tobacco Fields in Xuancheng of Southern Anhui. Soils, 45, 763-765.

[12]   Institute of Tobacco Research of CASS (2005) Tobacco Cultivation of China. Shanghai Science and Technology Press, Shanghai.

[13]   Lu, J.L. (2003) Plant Nutrition. 2nd Edition, China Agricultural University Press, Beijing.

[14]   Zhang, G.L. and Gong, Z.T. (2012) Soil Survey Laboratory Methods. Science Press, Beijing.

[15]   Yang, Y.R., Wang, X.X., Zhan, T.L. and Li, D.C. (2014) Utilization of Crop Straw Resources in Anhui Province, Eastern China. Bulgarian Journal of Agricultural Science, 20, 1302-1310.

[16]   Huang, C.Y. (2000) Pedology. China Agriculture Press, Beijing.