Effect of Vegetable Intercropping on the Nitrate Accumulation in Soil Profiles and Vegetables
WU Qiong1,2,DU Lian-feng2,ZHAO Tong-ke2,AN Zhi-zhuang2,WU Xiao-lei3,MA Mao-ting1,2(1.College of Resources and Environmental Sciences,Agricultural University of Hebei,Baoding 071000,China;2.Institute of Plant Nutrition and Resources,Beijing Academy of Agricultural and Forestry Sciences,Beijing 100097,China;3.Extension Service Agrotechnical Station,Miyun County,Beijing 101500,China)
Soil nitrate accumulation was often occurred because of excessive nitrogen fertilization application which easily led to nitrate pollution of groundwater and vegetable.The aim of this study was to determine the variation of nitrate in soil and crops under the intercropped system between different rooting depth vegetables,to study the temporal and spatial variation of soil nitrate,in addition,to reveal the difference of vegetables nitrate content.We selected the radish(deeper root)and celery(shallow root),then intercropped them together.The results showed that whether in preceding growth time or the harvest,NO3--N content of 0～20 cm soil layer increased by this intercropping while,concentrations of lower layers decreased,which indicated that this intercropping could reduce nitrate leaching.Furthermore,0～40 cm NO3--N accumulation of intercropping was more than that of sole crop,on the countrary,40～100 cm NO3--N stored less than that of sole crop system.In the whole profile of 0～100 cm soil,NO3--N accumulation of the intercropping was less than that of sole radish and celery for 1.4% and 9.0%,respectively.This intercropping system has the trendency to reduce vegetable nitrate.It indicated that this intercropping has the yield advantage to some extent because that total nitrogen concentration and yield of intercropped radish evidently were higher than those of sole radish.Also,this intercropping can reduce the apparent N losses.Reasonable vegetable intercropping can increase nitrate holding ability and reduce nitrate leaching.Therefore,it has the positive effect on vegetable yield and quality.
【Fund】： “十一五”科技支撑计划项目(2007BAD87B01 2007BAD87B02);; 北京市科技新星计划(B类)(2007B045);; 农业部农业生态环境保护项目:华北地区大中城市郊区蔬菜、水果、花卉生产区域地下水硝酸盐监测与评价;; 北京市农林科学院青年基金:设施蔬菜土壤累积硝酸盐的植物修复与施肥调控
【CateGory Index】： S63
【CateGory Index】： S63