Influence of Soil Residual Nitrogen and Coliforms in Potato Under Alternate Irrigation with Chlorine Reclaimed Water

doi:10.11924/j.issn.1000-6850.2012-2966

Abstract

Abstract: In order to solve food safety and potential environmental pollution problems with reclaimed water irrigation, field experiments were conducted, soil residual nitrogen, soil coliforms, coliforms in tuber skin, coliforms in tuber inner with reclaimed water irrigation under different irrigation technology, water quality and irrigation amount were analyzed. The results indicated that: the content of mineral nitrogen of top soil layer under chlorine reclaimed water with alternate surface drip irrigation was significantly higher than the full subsurface drip irrigation, alternate subsurface drip irrigation, full furrow irrigation, alternate furrow irrigation, the yield of chlorine reclaimed water with alternate irrigation was no significantly than the full irrigation, root-layer soil coliforms of chlorine reclaimed water with alternate irrigation was significantly less than others, moreover, the coliforms content in the potato tissue of chlorine reclaimed water with alternate irrigation was only 46 MPN/100 g, less than standard of GB/T 8884—2007. Thus, chlorine reclaimed water with alternate irrigation was an optimizing irrigation strategy, meanwhile, it could ensure healthy of potato and could enhance irrigation water use efficiency.

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