[6] Krishnan P, Alexander J D, Butler B J, et al. Soil Science Soiety of American Journal, 1980, 44: 1282.
[7] Sudduth K A, Hummel J W. Transaction of the ASAE, 1991, 34(4): 1900.
[8] Ben-Dor E, Banin A. Romote Sensing of Enviroment, 1994, 48: 261.
[6] Krishnan P, Alexander J D, Butler B J, et al. Soil Science Soiety of American Journal, 1980, 44: 1282.
[7] Sudduth K A, Hummel J W. Transaction of the ASAE, 1991, 34(4): 1900.
[8] Ben-Dor E, Banin A. Romote Sensing of Enviroment, 1994, 48: 261.
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