济宁地区南四湖流域的湖洼地区,自1964年大面积实行稻改以来,改变了原来一年一季麦或高粱、苘麻的习惯,形成了目前稻麦连作一年两熟的耕作制度.据调查:随着耕作制度的改革,农田杂草发生分布情况有了明显的变化,特别是水田杂草种类多,危害严重,已经严重威胁着产量的提高.过去,滨湖广大干群防除杂草,采取水旱轮作、精选种子、腐熟有机肥料、早泡 Since the large-scale implementation of rice reform in 1964, the lake depression in the Nansi Lake Basin in Jining has changed the habit of using wheat, sorghum and kenaf in the past year and has formed a tillage system in which wheat and wheat are double-cropped one year in a row. According to the survey, with the reform of the tillage system, the distribution of farmland weeds has been significantly changed, especially in the weeds in the paddy fields, which have seriously threatened the production increase. In the past, Grass, water and drought rotation, selection of seeds, decomposed organic fertilizer, early foam