Schacht H,Schenk M.Controlling the nutrition of cucumis-sativus in recirculating nutrient solution by nitrate-N and amino-N content of petiole Sap[J].Gartenbauwissenschaft,1994,59(3):97-102.
Roth G W,Beegle D B,Fox R H,et al.Development of a quicktest kit method to measure soil nitrate[J].Commun Soil Sci Plant Anal,1991,22(3-4):191-200.
[9]
Schaefer N L.Evaluation of a hand held reflectometer for rapid quantitative-determination of nitrate[J].Commun Soil Sci Plant Anal,1986,17(9):937-951.
[10]
Bischoff M,Hiar A M,Turco R F.Evaluation of nitrate analysis using test strips:comparison with two analytical laboratory methods[J].Commum Soil Sci Plant Anal,1996,27(15-17):2765-2774.