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1979年到至今,与法国罗纳克布朗公司合作,在北京和广州地区对恶草灵(Ronstar)在稻田的应用技术和效果进行了田间试验。试验中介绍和运用了两种目测评定化学除草效果的简易方法:一种是目测分级评定法;另一种是敏感级评定法。经过田间实际调查证明,这二种方法比目前通常采用的调查单位面积(平方米或平方尺)杂草数量和重量的方法简便的多,可节省六分之五的调查时间,其准确性也是比较可靠的,现将这二种分别介绍如下:
Since 1979, in cooperation with the French company Ronak Brown, field trials have been conducted on the application technology and effects of Ronstar in paddy fields in Beijing and Guangzhou. Two simple methods for visual evaluation of chemical herbicidal effects were introduced and used in the experiment: one is the visual grading method; the other is the sensitive grading method. As a result of field investigation, these two methods are much simpler than the commonly used methods for investigating the quantity and weight of weeds per unit area (square meters or square feet) at present and can save 5% of the investigation time. The accuracy of these two methods is also More reliable, now these two are introduced as follows: