C. Yang, J. H. Everitt, and J. Bradford, Comparisons of uniform and variable rate nitrogen and phosphorus fertilizer applications for grain sorghum, Transactions of the American Society of Agricultural Engineers, issue.2, pp.44-201, 2001.

Z. Shuhui, M. Chenglin, L. Wei, L. Wei, and X. Yan, Experimental study on the influence of variable rate fertilization on maize yield and soil nutrients, Journal of Agricultural Engineering, issue.8, pp.22-64, 2006.

. Wittry, J. David, M. Antonio, and P. , Comparison of Uniform- and Variable-Rate Phosphorus Fertilization for Corn???Soybean Rotations, Agronomy Journal, vol.96, issue.1, pp.26-33, 2004.
DOI : 10.2134/agronj2004.0026

M. Zhijun?zhao-chunjiang?liu-hui?huang-wenqian, F. Weiqiang, and W. Xiu, Development and performance assessment of map-based variable rate granular application system, Natural Science Edition, vol.30, issue.4, pp.338-342, 2009.

M. Zhijun?zhao, C. Weiqiang, J. Yongxian, and W. Guangwei, Prescription map identification and position lag calibration method for variable rate application of fertilizer, Transactions of the Chinese Society for Agricultural Machinery, pp.42-204, 2011.

Z. Chengyu and X. Haifeng, Our country measuring soil fertilizer technology to increase revenue and reduce expenditure effect research?? Based on empirical analysis of jiangsu and jilin provinces, pp.2009-2053

J. Zhang-shuhui?qi, Zongjian?Xu Yan?Research and application of control system for variable rate fertilizer applicator based On CPLD, ?Transactions of the the Chinese Society of Agricultural Engineering?2010?26, pp.200-204

M. Xu, M. Chenglin, S. Guoqi, and Z. Jiang, Design of variable rate fertilizer applicator, Transactions of the Chinese Society for Agricultural Machinery, pp.36-50, 2005.

W. Xiu, ?. Zhao-chunjiang, ?. Meng-zhijun, ?. Cheng-liping, and P. Yuchun, Xue Xuzhang?Design and experiment of variable rate fertilizer applicator, J]? Transactions of the Chinese Society of Agricultural Engineering, issue.5, pp.20-114, 2004.

L. Chunying, W. Xi, Z. Jun, W. Zhimin, and Z. Weidong, Design of the velocity system of the valve-controlled motor on the variable rate fertilizer applicator, pp.15-47, 2003.

H. Baofu, L. Chunying, W. Xi, L. Aiping, and Z. Hongxia, Design of control system of variable rate fertilization, pp.68-71, 2011.

Z. Linhuan, Study on hydraulic stepless speed control system of the variable rate fertilizer applicator, 2009.

Y. Yingjie, Z. Shuhui, Q. Jiangtao, X. Yan, and W. Wei, Positioning Method of Variable Rate Applicators in Irregular Field, Transactions of the Chinese Society for Agricultural Machinery, pp.42-158, 2011.

Z. Shuhui, M. Chenglin, D. Qiaoling, N. Xin, W. Caicong et al., Design of control system of variable rate fertilizer applicator in precision agriculture, Transactions of the Chinese Society of Agricultural Engineering, vol.20, issue.1, pp.113-116, 2004.

T. Yonghua, New type of PID control and application

L. Chunying, Y. Shujuan, W. Xi, and H. Bao-fu, PID Control Strategy of the Variable Rate Fertilization Control System, Transactions of the Chinese Society for Agricultural Machinery, pp.41157-162, 2010.

W. Liguo, Z. Xiaochao, Y. Yanwei, L. Liu-yangchun, and . Zhuoli, Design and experiment of 2F-6-BP1 variable rate assorted fertilizer applicator, Transactions of the Chinese Society of Agricultural Engineering, vol.28, issue.4, pp.14-18, 2012.