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草克星是日本日产化学工业株式会社生产的一种水稻田除草剂，具有用量小、除草效果好、广谱高效、价格适宜等优点。但从多年的生产实践上看，有些稻农在使用草克星时并没有收到理想的除草效果。究其原因，主要是没有正确掌握草克星的施药时间，存在着施药过早或偏晚两种情况，
Grass nemesis Japan’s Nissan Chemical Co., Ltd. production of a rice field herbicides, with a small dosage, weeding effect is good, broad-spectrum efficient, affordable and so on. However, many years of production practices have shown that some rice farmers did not receive the ideal weeding effect when using grass nectar. The reason is mainly not properly grasp the application of grass nemesis time, there are two kinds of application of premature or late,