Vegetable cultivation under greenhouse conditions leads to rapid accumulation of nutrients, acidification and salinity of soils and groundwater contamination in South-Eastern China

Vegetable cultivation during winter season is economically profitable, but the impact of the intensive production on soil and water quality remains to be studied. The objectives of this study were to investigate the seasonal dynamics of soil nutrients, acidification and salt accumulation in vegetable fields in South-Eastern China. Various vegetables were grown either under open-field conditions or under two different alternating open-field and greenhouse conditions with three replications. Soil samples were collected periodically and analyzed for pH, plant available nitrogen (N), phosphorous (P), potassium (K), electrical conductivity (EC), and urease activity. Water samples from wells located in or near the plots were collected and analyzed for nitrate. Soil nitrate, available phosphate and salt concentrations declined in summer under open-field conditions and significantly increased from December to May under greenhouse conditions. Exchangeable K also decreased in summer season, but did not increase in the spring. Under alternating open-field and greenhouse conditions, nutrient accumulation, soil salinity and acidification were significantly higher for soil used for vegetable cultivation for 2 years (2-y-plot) than that for only half year (0.5-y-plot). The accumulation of nitrate significantly correlated with soil EC and soil acidification. Thirty-two percent of groundwater samples from the 2-y-plot showed a nitrate concentration higher than 50 mg NO3 l−1. Conversely, no groundwater sample of 0.5-y-plot showed such high nitrate concentration. It can be concluded that the nitrate accumulation in soil used for vegetable cultivation under alternating open-field and greenhouse conditions not only causes soil salinization and soil acidification but also presents a high pollution potential for groundwater.

[1]  C. Dell,et al.  Changes in enzyme activities and microbial biomass of tallgrass prairie soil as related to burning and nitrogen fertilization , 1999 .

[2]  J. Campbell.  SPATIAL VARIABILITY OF SOILS , 1979 .

[3]  S. Schubert,et al.  Soil pH changes during legume growth and application of plant material , 1996, Biology and Fertility of Soils.

[4]  Frank Brentrup,et al.  Soil- and plant-based nitrogen-fertilizer recommendations in arable farming , 2005 .

[5]  A. Nakano,et al.  Effects of Application of Low-Sulfate Slow-Release Fertilizer (LSR) on Shoot and Root Growth and Fruit Yield of Tomato (Lycopersicon esculentum Mill.) , 2003 .

[6]  C. Appelo,et al.  A hydrogeological and hydrochemical explanation of the groundwater composition under irrigated land in a Mediterranean environment, Algarve, Portugal. , 1998 .

[7]  X. Ju,et al.  Changes in the soil environment from excessive application of fertilizers and manures to two contrasting intensive cropping systems on the North China Plain. , 2007, Environmental pollution.

[8]  C. Watson,et al.  Efficiency and future potential of urea for temperate grassland , 1990, Fertilizer research.

[9]  J. S. Schepers,et al.  Nitrate contamination of groundwater in North America , 1989 .

[10]  T. Darwish,et al.  Salinity evolution and crop response to secondary soil salinity in two agro-climatic zones in Lebanon , 2005 .

[11]  A. Page.  Methods of soil analysis. Part 2. Chemical and microbiological properties. , 1982 .

[12]  Huilin Li,et al.  Nitrogen mineralization in paddy soils of the Taihu Region of China under anaerobic conditions: dynamics and model fitting , 2003 .

[13]  F. Yan,et al.  Soil pH changes after application of plant shoot materials of faba bean and wheat , 2000, Plant and Soil.

[14]  Fusuo Zhang,et al.  Nitrogen balance and groundwater nitrate contamination: comparison among three intensive cropping systems on the North China Plain. , 2006, Environmental pollution.

[15]  J. Kirkegaard,et al.  Glucosinolate and isothiocyanate concentration in soil following incorporation of Brassica biofumigants , 2006 .

[16]  R. Miller,et al.  Chemical and microbiological properties , 1982 .

[17]  W. L. Powers,et al.  Bromide and nitrogen-15 tracers of nitrate leaching under irrigated corn in Central Nebraska , 1996 .

[18]  S. R. Olsen,et al.  Estimation of available phosphorus in soils by extraction with sodium bicarbonate , 1954 .

[19]  Xin-ping Chen,et al.  Yield and Nitrogen Balance of Greenhouse Tomato (Lycopersicum esculentum Mill.) with Conventional and Site-specific Nitrogen Management in Northern China , 2007, Nutrient Cycling in Agroecosystems.

[20]  You-Lu Bai,et al.  Spatial variability of Soil Nutrients and Influencing Factors in a Vegetable Production Area of Hebei Province in China , 2006, Nutrient Cycling in Agroecosystems.

[21]  J. Kirkegaard,et al.  Isothiocyanate release from soil-incorporated Brassica tissues. , 2002 .

[22]  H. Blume,et al.  Page, A. L., R. H. Miller and D. R. Keeney (Ed., 1982): Methods of soil analysis; 2. Chemical and microbiological properties, 2. Aufl. 1184 S., American Soc. of Agronomy (Publ.), Madison, Wisconsin, USA, gebunden 36 Dollar. , 1985 .

[23]  David M. Miller,et al.  Tillage Influence on Soluble Salt Movement in Silt Loam Soils Cropped to Paddy Rice , 2000 .

[24]  Peter Christie,et al.  Evaluation of current fertilizer practice and soil fertility in vegetable production in the Beijing region , 2004, Nutrient Cycling in Agroecosystems.

[25]  H. Marschner,et al.  Ammonium and nitrate uptake rates and rhizosphere pH in non-mycorrhizal roots of Norway spruce [Picea abies (L.) Karst.] , 1991, Trees.

[26]  A. J. Gijsman.  Rhizosphere pH along different root zones of Douglas-fir (Pseudotsuga menziesii), as affected by source of nitrogen , 1990, Plant and Soil.

[27]  R. Albiach,et al.  Microbial biomass content and enzymatic activities after the application of organic amendments to a horticultural soil , 2000 .

[28]  G. Stamou,et al.  Soil quality variables in organically and conventionally cultivated field sites , 2006 .