95，Fukuoka N，Kano Y. The difference in the development of ho-llowing in roots‘Gensuke’radishbetween the early and late sowing of seeds. J. Jpn. Soc. Hort. Sci.，1992，60，881～887
106 Kano Y，Fukuoka N. Effect of planting density on the occu-rrence of hollow root inJapanese radish cv. ‘Gensuke’. J. Jpn. Soc. Hort. Sci.，1991，60，379～386
9Saunders L S,Webb T H,Barringer J R F. Integrating economic data with spatial biophysical data to analyse profitability and risks of wheat production on a regional basis [ J]. Agricultural Systems, 1997,55 (4) :583 -599.
10Van den Berg M M, Hengsdijk H, Wolf J, et al. The impact of increasing farm size and mechanization on rural income and rice production in Zhejiang Province, China [ J ]. Agricultural Systems, 2007,94 (3) :841 -850.
