| Nutrient accumulation in the soils under sun-light greenhouses of Xi’an area |
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| DOI：10.7606/j.issn.1000-7601.2007.06.38 |
| Key Words: sunlight greenhouse soil nutrient salt accumulation |
| Author Name | Affiliation | | XU An-min | College of Resources ＆ Environmental Science Northwest A＆F University,Yangling,Shaanxi 712100,China | | ZHANG Ying-li | College of Resources ＆ Environmental Science Northwest A＆F University,Yangling,Shaanxi 712100,China | | LI Zi-yan | College of Resources ＆ Environmental Science Northwest A＆F University,Yangling,Shaanxi 712100,China | | ZHOU Jian-bin | College of Resources ＆ Environmental Science Northwest A＆F University,Yangling,Shaanxi 712100,China | | CHEN Zhu-jun | College of Resources ＆ Environmental Science Northwest A＆F University,Yangling,Shaanxi 712100,China |
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| Abstract: |
| The contents of different nutrients in 0～100 cm soil profiles of 24 sun-light greenhouses at the suburbs of Xian were determined to evaluate the accumulation of nutrients and salts in the soils under sun-light greenhouses.The results showed that the average content of organic matter in 0～20 cm soil layer of greenhouse was 22.5 g/kg,which was significantly higher than that in the open fields.The contents of available phosphorus and available potassium in the layer of 0～20 cm of greenhouses were 261 mg/kg and 412 mg/kg,respectively,which were about 569% and 194% higher than that in the open fields,respectively. The pH in 0～40 cm soil layer of the greenhouses was 0.17 pH unit lower than that in the open fields,indicating the acidity of the soils under sun-light greenhouse.There were no significant differences in the content of NO-3-N among the 24 greenhouse soils;however,the NO-3-N in 24 greenhouse soils was significant higher than that in the open field,the increases in NO-3-N in greenhouses compared to open fields was in range of 23.1～89.7 mg/kg.There were no significant differences in the content of NH+4-N in greenhouse and open fields,indicating the stable of NH+4-N in upland soils.The electric conductivity(EC) in greenhouses was about two times as high as that in the open fields; however,the soil EC of the greenhouse was not reached the harmful level to crop in the study region. |
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