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扁秆藨草Scirpus Fr. Schmidt (S. biconcovus Obwi)又称三棱草,是稻田中的多年生恶性杂草。为了控制其为害,我们于1981—1982年在一八七和一八八团对其发生规律和防除措施进行了观察和试验。 发生规律 1.发芽与出苗 扁秆藨草以种子、根茎和球茎进行繁殖。据观察,当日平均气温达10℃以上时,稻田进水后(5月1日前后),5—10厘米土层中的根茎和球茎便发芽生长。当日平均气温17℃以上时,稻田进水20天后,5厘米土层以内的种子即发芽生长。
Scirpus Fr. Schmidt (S. biconcovus Obwi), also known as the trifoliate grass, is a perennial malignant weed in paddy fields. In order to control its damage, we observed and tested its laws and measures of prevention and control in the 181 and 188 regiments from 1981 to 1982. The law occurs 1. Sprouting and emergence of flat barbed grass to seeds, rhizomes and bulbs breeding. It is observed that when the average temperature of the day reaches 10 ℃ or above, the rhizomes and bulbs in the 5-10 cm soil layer will germinate and grow after water inflow (before and after May 1). When the average temperature of the day is above 17 ℃, the seeds within 5 cm soil layer will germinate and grow after 20 days of infiltration into the paddy field.