1. Wang, J., Wu, F. Q. & Meng, Q. L. Analysis on soil moisture character of dry orchard on hilly and gully regions on the Loess Plateau. J. Northwest For. Univ. 21, 65–68 (2006).
2. Gong, W., Yan, X. Y. & Wang, J. Y. Effect of long-term fertilization on soil fertility. Soils. 43, 336–342 (2011).
3. Liu, H. J., Ju, X. T., Tong, Y. A., Zhang, F. S. & Lv, J. L. The status and problems of fertilization of main fruit trees in Shaanxi Province. Agric. Res. Arid Areas. 20, 38–44 (2002).
4. Zhao, Z. P., Tong, Y. A., Gao, Y. M. & Fu, M. M. Effect of different fertilization on yield and quality of Fuji apple. Plant Nutr. Fert. Sci. 15, 1130–1135 (2009).
5. Wang, X. Y., Tong, Y. A., Liu, F. & Zhao, Z. P. Evaluation of the situation of fertilization in apple fields in Shaanxi province. Plant Nutr. Fert. Sci. 19, 206–213 (2013).