2017年07月26日 星期三
 
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【Agricultral Sciences】Contents and Changes of Potassium in Plough Layers of Xuancheng, South Anhui Province
发布时间:2017-05-27  来源:土壤与农业可持续发展国家重点实验室  浏览:142

Lin K, Li DC, Song XD, Zu CL, Jiang CQ, Shen J, Ma CX, Gao Q, Zhu QF, Ji XJ, Zhang G, Xue L. Contents and Changes of Potassium in Plough Layers of Xuancheng, South Anhui Province. Agricultral Sciences, 2017, 8(5): 348-355

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·kg-1 to 844 mg·kg-1 with an average of 68 mg·kg-1, and 82.7% of topsoil samples were insufficient in RA-K (<100 mg·kg-1). Comparatively in 2015 SA-K content ranged from 230 mg·kg-1 to 1340 mg·kg-1 with an average of 595 mg·kg-1, and 13.7% of soil samples were insufficient in SA-K (<400 mg·kg-1); RA-K content ranged from 46 mg·kg-1 to 352 mg·kg-1 with an average of 134 mg·kg-1, and 25.8% of soil samples were insufficient in RA-K (<100 mg·kg-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.
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