Peng S, García F V, Laza R C et al. Adjustment for specific leaf weight improves chlorophyll meter's estimate of rice leaf nitrogen concentration[J]. Agronomy Journal, 1993, 85(5): 987-990.
[2]
Gianquinto G, Sambo P, Borsato D. Determination of SPAD threshold values for the optimisation of nitrogen supply in processing tomato[J]. Acta Horticulturae, 2004, 700: 159-166.
[3]
Sandoval-Villa M, Wood C W, Guertal E A. Tomato leaf chlorophyll meter readings as affected by variety, nitrogen form, and nighttime nutrient solution strength[J]. Journal of Plant Nutrition, 2002, 25(10): 2129-2142.
Leigh R A, Johnston A E. Nitrogen concentrations in field-grown spring barley: an examination of the usefulness of expressing concentrations on the basis of tissue water[J]. Journal of Agricultural Science, 1985, 105(2): 397-406.
[9]
Huett D, Rose G. Diagnostic nitrogen concentrations for tomatoes grown in sand culture[J]. Australian Journal of Experimental Agriculture, 1988, 28(3): 401-409.
[10]
Hochmuth G J. Efficiency ranges for nitrate-nitrogen and potassium for vegetable petiole sap quick tests[J]. Horttechnology, 1994, 4(3): 218-222.
Proietti S, Moscatello S, Leccese A et al. The effect of growing spinach(Spinacia oleracea L.) at two light intensities on the amounts of oxalate, ascorbate and nitrate in their leaves[J]. Journal of Horticultural Science and Biotechnology, 2004, 79(4): 606-609.
[14]
Liu W K, Yang Q C. Effects of short-term treatment with various light intensities and hydroponic solutions on nitrate concentration of lettuce[J]. Acta Agriculturae Scandinavica(Section B-Soil and Plant Science), 2012, 62(2): 109-113.
Zhao C, Liang J, He J et al. Effects of elevated temperature and nitrogen fertilization on nitrogen metabolism and nutrient status of two coniferous species[J]. Soil Science and Plant Nutrition, 2012, 58(6): 772-782.
[17]
Prado R D M, Caione G. Plant analysis[J]. Soil Fertility, 2012, 115-134.
[18]
Hartz T K, Smith R F, LeStrange M et al. On-farm monitoring of soil and crop nitrogen status by nitrate-selective electrode[J]. Communications in Soil Science and Plant Analysis, 1993, 24(19-20): 2607-2615.
[19]
Fontes P C R, Araujo C. Use of a chlorophyll meter and plant visual aspect for nitrogen management in tomato fertigation[J]. Journal of Applied Horticulture, 2006, 8(1): 8-11.
Olsen J K, Lyons D J. Petiole sap nitrate is better than total nitrogen in dried leaf for indicating nitrogen status and yield responsiveness of capsicum in subtropical Australia[J]. Australian Journal of Experimental Agriculture, 1994, 34(6): 835-843.
Farneselli M, Tei F, Simonne E. Reliability of petiole sap test for N nutritional status assessing in processing tomato[J]. Journal of Plant Nutrition, 2014, 37(2): 270-278.
Calatayud á, Gorbe E, Roca D et al. Effect of two nutrient solution temperatures on nitrate uptake, nitrate reductase activity, NH+4 concentration and chlorophylla fluorescence in rose plants[J]. Environmental and Experimental Botany, 2008, 64(1): 65-74.