试验研究了马铃薯5个时期的除草效应,并与无草区和未除草区进行了比较。两年结果一致表明:杂草群体总量在播种后6周内是增加的,随后急剧下降。杂草(除草时除去的和最后田间收割的)总干重以未除草处理最高;播种后第10周除草处理次之。两年试验中无草区的块茎产量始终保持第一,其次是播种后第4和第6周除草的处理,其余(包括播种后第2周除草的)处理显著减产,未除草对照区减产40～43％。 The herbicidal effects of potato in five periods were studied and compared with that of no grass and no grass. The two-year results consistently show that the total weed population increased within 6 weeks after sowing and then dropped sharply. The total dry weight of weeds (removed during weeding and final harvested) was the highest without weeding, followed by the weeds at 10 weeks after sowing. The yield of tubers in the grassless areas remained the first in two years, followed by the weeds in the fourth and sixth weeks after sowing. The rest (including weeding in the second week after sowing) was significantly reduced and the un-weed control reduced by 40% ~ 43%.