1. Selection of herbicides Most of the current selections include gram-free and glyphosate (Nongda, Nongwang), etc., no trace is a contact herbicide, no systemic, can kill weeds. The green part of the ground has little damage to the root system and has a short shelf life. Because the root system survives, it is conducive to the soil and water conservation of the tea plantation; glyphosate has a systemic conductivity, which has a greater killing effect on weed roots and has a longer lasting effect. . In response to these characteristics, the chemical weeding of tea gardens can be rationally selected according to the specific conditions. The tea garden has a high terrain and requires attention to soil and water conservation. To keep grass and keep a small ecological environment, we should use weeds to eliminate weeds. The tea plantation is flat and annual. Grass or grass weeds are more, do not need to keep the grass, then choose glyphosate herbicide.
2. Notes on the use of herbicides 2.1 The number of uses; according to the morning and evening of the occurrence of weeds in tea gardens, it can be roughly divided into two categories: spring (before June) and summer grass (after July). The number of spraying is generally 1-2 per year. Secondly, if spring grass and summer grass are more sprayed in mid-May and late July, if there are few weeds, you can spray once in July.
2.2 The use of technology: spraying herbicide must be uniform, spraying time with weeds without dew is appropriate, 12 hours after spraying can not meet the rain, otherwise, need to re-spray. Glyphosate and gram-free have a great influence on the tea garden. If it is sprayed on the tree, it will cause the dead branches of the tea tree, dead trees or the leaves of the next year to grow in the shape of willow. Therefore, when spraying liquid, it should be noted that: 1 wind can not spray; 2 try not to use motorized sprayer, but use a backpack sprayer; 3 sprayer nozzle to install a plastic bowl; to ensure directed spray. It is strictly forbidden to spray the liquid onto the tea branches, stems and leaves.
In order to increase the satisfactory effect of the herbicide, in the preparation process of the chemical liquid stock, additives such as ammonium sulfate 1.5kg/667mZ, washing powder 0.15kg/667nd or diesel 0.2kg/667m2 are often added.
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