The experiments used orthogonality design with three replications .

试验采用正交设计，重复三次。

The orthogonality of laguerre polynomials and related problems .

laguerre多项式的正交性及其相关问题之研究。

Based on the previous screenhouse study and field experiment , fertilization , plant variety and plant density were studied on two selected cropping systems : rape-rice-rice and wheat-rice , using an orthogonality design .

在过去网室研究和大田试验的基础上，在油菜-水稻-水稻和小麦-水稻两种供试种植制度上研究了施肥、作物品种和种植密度，采用正交设计。