Split plot design was used with variety in the main plots and P and K combination treatments in the sub-plots.田间试验采用裂区设计，将品种设在主区，磷、钾肥配合处理设置在副区。
The early rice experiment was in split-split plot design with 3×3×2 for variety × fertilizer × plant population.早稻试验采用裂区-裂区设计3×3×2布置品种×肥料×密度。
The late rice experiment was in split plot design with 3 × 3 for fertilizer in main plot and variety in subplot.晚稻试验为3×3裂区设计，肥料为主区，品种为副区。