The experiment design included 2 levels nitrogen, 3 levels potassium with or without silicon application, and 2 plant densities, totally being 10 treatments with 3 replications .

• 试验设计包括2个氮水平、3个钾水平，施或不施硅肥、2个植株密度，总共10个处理，三次重复（表2）。