玉米地杂草的出苗规律

Emergence Rule of Weeds in Maize Field

为探明玉米地杂草出苗高峰期,指导玉米田间适时施药防除杂草提供依据,采用实地调查方法对玉米地杂草发生及其出苗规律进行研究。结果表明：玉米地杂草发生危害主要以一年生杂草为主,发生密度占出苗杂草数的83.99%;杂草出苗高峰期在4月下旬至5月上旬,即翻地后20~30d,杂草出苗率为36.40%;在翻地后35d杂草累计出苗率达56.27%,该时期是玉米地施用茎叶除草剂的最佳时期。

In order to make clear the emergence peak of weeds and provide guidance tor control of weeds in a right time in maize, emergence rule of weeds in maize in the middle areas of Guizhou was conducted by field investigation. The results showed that the main harmful weeds was based on annual weeds in maize with their density accounting for 83.99% . Weed emergence peak was from late April to early May, that was 20 - 30 d after ploughing, weed emergence rate was 36.40% ; 35 d after ploughing, the cumulative rate of emergence weeds accounted for 56. 27 %, so this period was the best period of application of the stems and leaves herbicide in maize.