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对麦田进行化学除草,必须把握好五个要点,才能用药适当,提高除草效果。五个要点是: 1 气温 麦田化学除草效果随气温的升高而提高。一般内吸性除草剂,在小麦苗长至1叶1心,触杀性除草剂在2叶1心至3叶1心,日平均气温达20℃左右时施药为佳。若日平均气温低于10℃,最好不要使用化学除草剂。 2 土壤湿度 当土表干燥时,除草剂的使用效果就会受到影响。因此施药应加大用水量,以75～100kg/667m~2为宜。
To carry out chemical weeding on the wheat field, we must grasp five key points in order to properly administer the herbicides and improve the weeding effect. Five main points are: 1 Temperature Wheat field chemical weeding effect increases with temperature. Generally systemic herbicides, wheat seedlings grow to 1 leaf 1 heart, touch herbicide in the 2 leaves 1 heart to 3 leaves 1 heart, the average daily temperature of about 20 ℃ when the application is better. If the average daily temperature is below 10 ℃, it is best not to use chemical herbicides. 2 Soil Moisture When the soil surface is dry, the effectiveness of herbicides will be affected. Therefore, application should increase the amount of water to 75 ~ 100kg / 667m ~ 2 is appropriate.