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用成都平原稻田水旱两熟和新三熟定位试验各小区耕层上壤进行盆栽试验，观察不同种植制度对杂草生长的影响。发现小麦连作和麦油轮作条件下杂草生长较旺，油油连作次之，而麦油苕轮作和麦油轮作（无肥）下杂草生长较弱，且新三熟对杂草生长具有很强的抑制作用，充分证明新三熟栽培制度具有多种效应。
Pot experiments were conducted on the topsoil of paddy field in paddy field of Drought and Flooding and New Tri-Positioning Experiment in Chengdu Plain, and the effects of different planting systems on weed growth were observed. It was found that the growth of weeds in wheat continuous cropping and wheat rotation was more flourishing, followed by the continuous cropping of oil and oil, while the growth of weeds was weaker in wheat rotation and wheat rotation (no fertilizer) Strong inhibitory effect, fully proved that the new three-cropping system has a variety of effects.