Thirteen treatments with combinations of 5 levels of P and K fertilizers were arranged with regression design for each variety in the subplots (Table 2.).
Thirteen treatments with combinations of 5 levels of P and K fertilizers were arranged with regression design for each variety in the subplots (Table 2.).
每一个品种施用磷、钾肥各设5个水平，共13个组合处理，采用回归设计（见表2）。