Peng S, Garcia F V, Laza R C, et al. Increased N use efficiency using a chlorophyll meter on high-yielding irrigated rice[J[. Field Crops Research, 1996, 47: 243-252.
[8]
Cartelat A, Cerovic Z G, Goulas Y, et al. Optically assessed contents of leaf polyphenolics and chlorophyll as indicators of nitrogen deficiency in wheat (Triticum aestivum L.)[J[. Field Crops Research, 2005,91(1):35-49.
Berlin J, Beier H, Fecker L, et al. Conventional and new approaches to increase the alkaloid production of plant cell cultures[A[. In:Neumann, Barz K H, Reinhard W E. Primary and Secondary Metabolism of Plant Cell Cultures[M[. Berlin: Springer, 1985. 272-280.
[11]
Payne J, Hamill J D, Robins R J, et al. Production of hyoscyamine by ‘hairy root cultures’ of Datura stramonium[J[. Planta Medica, 1987, 53: 474-478.
[12]
Sugimoto Y, Sugimura Y, Yamada Y. Effects of culture conditions on bisbenzylisoquinoline alkaloid production in cultured roots of Stephania cepharantha[J[. Agricultural Biology Chemistry, 1988, 52: 1495-1498.
[13]
Sreevalli Y, Kulkarni R N, Baskaran K, et al. Increasing the content of leaf and root alkaloids of high alkaloid content mutants of periwinkle through nitrogen fertilization[J[. Industrial Crops and Products, 2004, 19:191-195.
Evans J R. Nitrogen and photosynthesis in the flag leaf of wheat (Triticum aestivum)[J[. Plant Physiology, 1983, 72: 297-302.
[21]
Evans J R. Photosynthesis and nitrogen relationships in leaves of C3 plants[J[. Oecologia, 1989, 78: 9-19.
[22]
Afridi M M R K, Afaq Wasiuddiun S H, Khalique A. Effect of different levels of nitrogen on growth and alkaloid content of Datura innoxia L[J[. Industrial Journal Pharmacology, 1977, 6: 165-166.
[23]
Demeyer K, Dejaegere R. Influence of the ion-balance in the growth medium on the yield and alkaloid content of Datura stramonium[J[. Plant Soil, 1989, 114: 289-294.