4Oz E, Tekin A B, Evcim H, et al. Effect of variety and row spacing on the performance of a cotton picker[J]. Journal of Food Agriculture&Environment,2011,9(1 ):236 -242.
5Bednarz C W, Shurley W D, Anthony W S, et al. Yield, quality and profitability of cotton produced at va- rying plant densities[J]. Agronomy Journal, 2005,97 (1) :235 -240.