At the same time, Chinese cabbage, lettuce and Lactuca sativa L were potted plant and fertilized at 1/4 the amount of the local vegetable fertilizer.

• 按当地菜农施肥量的1/4量分期施肥，盆栽小白菜、生菜和油麦三种叶菜，并称取各自的经济产量。