Effects of a catch crop and reduced nitrogen fertilization on nitrogen leaching in greenhouse vegetable production systems
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Greenhouse vegetable cultivation has greatly increased productivity but has also led to a rapid accumulation of nitrate in soils and probably in plants. Significant losses of nitrate–nitrogen (NO3-N) could occur after heavy N fertilization under open-field conditions combined with high precipitation in the summer. It is urgently needed to improve N management under the wide spread greenhouse vegetable production system. The objective of this study was to evaluate the effects of a summer catch crop and reduced N application rates on N leaching and vegetable crop yields. During a 2-year period, sweet corn as an N catch crop was planted between vegetable crops in the summer season under 5 N fertilizer treatments (0, 348, 522, 696, and 870 kg ha−1) in greenhouse vegetable production systems in Tai Lake region, southern China. A water collection system was installed at a depth of 0.5 m in the soil to collect leachates during the vegetable growing season. The sweet corn as a catch crop reduced the total N concentration from 94 to 59 mg l−1 in leached water and reduced the average soil nitrate N from 306 to 195 mg kg−1 in the top 0.1-m soil during the fallow period of local farmers’ N application rate (870 kg ha−1). Reducing the amount of N fertilizer and using catch crop during summer fallow season reduced total N leaching loss by 50 and 73%, respectively, without any negative effect on vegetable yields.
KeywordsGreenhouse vegetable Environmental hazard Summer catch crop Fertilizer N management N loss
We are grateful to the National Basic Research Program of China (2007CB109303), the NSFC–JST project (No. 30821140542) and the Major Science and Technology Program of China for Water Pollution Control and Treatment (No. 2008ZX07101-005) for financial supports.
- Conrad Y, Fohrer N (2009) Modelling of nitrogen leaching under a complex winter wheat and red clover crop rotation in a drained agricultural field. Phys Chem Earth 34:530–540Google Scholar
- Helander CA (2004) Residual nitrogen effects on a succeeding oat (Avena sativa L.) crop of clover species and ryegrass (Lolium perenne l.) undersown in winter wheat (Triticum aestivum L.). Acta Agric Scand Sect B-Soil Plant Sci 54:67–75Google Scholar
- Min J, Shi WM, Wang JR, Hu ZJ (2007) A new installation for collecting seepage of greenhouse soil. Soils 39:1009–1011 (in Chinese)Google Scholar
- Snapp SS, Swinton SM, Labarta R, Mutch D, Black JR, Leep R, Nyiraneza J, O’Neil K (2005) Evaluating cover crops for benefits, costs and performance within cropping system niches. Agron J 97:322–332Google Scholar
- Svensson KS, Lewan E, Clarholm M (1994) Effects of a ryegrass catch crop on microbial biomass and mineral nitrogen in an arable soil during winter. Swedish J Agric Res 24:31–38Google Scholar
- Wang Q, Li Y, Klassen W (2005) Influence of summer cover crops on conservation of soil water and nutrients in a subtropical area. J Soil Water Conserv 60:58–63Google Scholar