D3-P2-A2B

In 20 L of distilled water, Nutrient B was added to distilled water in 1 mL doses up to 25 mL. Next Nutrient A was added in 1 mL doses up to 50 mL. This is coded in the Nutrient column. Nutrient A = 1, Nutrient B = 2.取20 L蒸馏水，以1 mL为单次添加剂量向其中加入营养物B（Nutrient B），直至总添加体积达25 mL；随后以相同单次添加量加入营养物A（Nutrient A），直至总添加体积达50 mL。该实验变量通过营养物（Nutrient）列进行编码，编码规则为：营养物A记为1，营养物B记为2。