[1] Malley D F, Yesmin L, Wray D, et al. Commun. Soil Sci. Plant Anal., 1999, 30: 999.
[2] Cozzolino D, Moro′n A. J. Agric. Sci., 2003, 140: 65.
[3] Maleki M R, Van Holm L, Ramon H, et al. Biosystems Engineering, 2006, 95(3): 425.
[4] He Y, Huang M, García A, et al. Computers and Electronics in Agriculture, 2007, 58(2): 144.
[5] Liu Huanjun, Zhang Yuanzhi, Zhang Xinle, et al. Pedosphere, 2009, 19(4): 532.
[6] Martin P D, Malley D F, Manning G, et al. Can. J. Soil Sci., 2002, 82: 413.
[7] Fox G A, Sabbagh G J. Soil Sci. Soc. Am. J., 2002, 66: 1922.
[8] He Y, Song H Y, Pereira A G, et al. Lecture Notes in Computer Science, 2005, 3644: 859.
[9] Aichi H, Fouad Y, C Walter, R A et al. Biosystems Engineering, 2009, 104(3): 442.
[10] Jacquemoud S, Baret E, Hanocq J F. Remote Sensing of the Environment, 1992, 41: 123.
[11] Zimmermann M, Leifeld J, Fuhrer J. Soil Biology and Biochemistry, 2007, 39(1): 224.
[13] Summers D, Lewis M, Ostendorf B, et al. Ecol. Indicat. (2009), doi: 10.1016/j.ecolind.2009.05.001.
[16] Stoner E R, Baumgardner M F. Soil Sci. Soc. Am. J., 1981, 45: 1161.