文献类型： 外文期刊

作者： Hu Yun-Cai ¹ ; Song Zhi-Wen ² ; Lu Wen-Long ² ; Poschenrieder, C. ¹ ; Schmidhalter, U. ¹ ;

作者机构： 1.Tech Univ Munich, Chair Plant Nutr, D-85350 Freising Weihenstephan, Germany

2.Tianjin Acad Agr Sci, Inst Informat, Tianjin, Peoples R China

关键词： electrical conductivity;greenhouse vegetables;over-fertilization;soil pH;soil survey

期刊名称：PEDOSPHERE （ 影响因子：3.911； 五年影响因子：4.814 ）

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收录情况： SCI

摘要： Nine districts covering the main greenhouse vegetable areas in Tianjin Municipality of the North China Plain were selected for the soil investigation in 2010 to survey the current soil nutrient status (soil available N, P and K), acidification and salinization due to excessive input of fertilizers in greenhouses in Tianjin. The study showed that, in particular, soil available P content increased with the age of greenhouses. In contrast, our results did not reveal higher K accumulation and lowered pHin the greenhouse soils compared with cultivation in open fields. Over-fertilization, causing high NO_3 accumulation, most likely resulted in salinity problems in the greenhouses. Ninety percent of the investigated greenhouse soils had electrical conductivity values of saturated paste extracts of 2-10 d S m~(-1), which might affect the yields of vegetable crops like green bean, pepper, cabbage, carrot, eggplant, lettuce, spinach, celery, cucumber and tomato. The findings of our survey of the current fertility and salinity problems in greenhouse soils suggest that there is an urgent need to improve the farmers' practices and strategies in fertilization management in greenhouses of China. Because education and the agricultural technical extension services may play a more important role in avoiding overuse of fertilizers, we suggest that current nutrient management practices should be improved in the near future through training of local farmers in farmers' schools and through strengthening the agricultural extension services with practical techniques.