[1] Mistele B, Schmidhalter U. European Journal of Agronomy, 2008, 29: 184.
[2] Li Fei, Gnyp M L, Jia Liangliang, et al. Field Crops Research, 2008, 106: 77.
[3] Jain N, Ray S S, Singh H P, et al. Precision Agric, 2007, 8: 225.
[4] Yang Feng, Li Jianlong, Gan Xiaoyu, et al. Computers and Electronics in Agriculture, 2010, 70: 52.
[6] Zhou Qifa, Wang Jihua. Journal of Plant Nutrition, 2003, 26: 607.
[7] Graeff S, Claupein W. European Journal of Agronomy, 2003, 19: 611.