Corn herbicide use technology
The principle of action of herbicides is more complicated, and different principles of action need to be fully utilized through a certain use method. The scientific use of pesticides in technical problems has been particularly prominent in the application of herbicides. The weeds that are the object of control are the same as the crops that belong to higher plants. Their physiological and biochemical characteristics are similar. Herbicides are used to control weeds, and on the other hand we must kill weeds. On the other hand, we must avoid even the same crops. After crop damage, this places high demands on the scientific use of herbicides. 1. Pre-emergence herbicide weed control mechanism: Most pre-emergence herbicides are absorbed by the weed seedlings (generally monocotyledon weeds are absorbed by the coleoptile and dicotyledon weeds are absorbed by the hypocotyls) and are rarely absorbed by roots. . To achieve the weeding effect, the collected medicine must reach 0-5 cm in the “weed germination circleâ€. 2. Problems in spring application of pre-emergence herbicides in North China: Northern China's spring application period (late April to mid-May) often encounters strong winds, drought, and rain. After the herbicide is applied, it is easily scratched by the wind or stays on the ground. It cannot contact the weeds and it is difficult to exert herbicidal effects. If there is no rainfall or irrigation after spraying, mechanical measures should be taken to ensure efficacy. 3, using the seedling herbicide technical points: 1) The quality of the site preparation is better: The ground is required to be ground and broken, and there is no plant residue on the surface to ensure the uniform distribution of pesticides. 2) Select the officially registered pesticide species 3) Use standard dispensing machinery and accurate spray technology: Spraying pre-emergence herbicides requires spraying droplets with a diameter of 300-400 microns and 30-40 droplets per square centimeter. Artificial backpack sprayer should use fan-shaped sprayer, with 11003 fan-shaped nozzle, 50 mesh filter, spray pressure 2 atm, spray volume 225 ~ 300 liters / ha (15 ~ 20 liters per acre), a spray when spraying A ridge, not to shake the spray around, set the nozzle and the ground height, spray pressure, uniform speed spray. Tractor sprayer with fan-shaped nozzle, with 11003, 11004 fan-shaped nozzle, 50 mesh filter, spray pressure 2 to 3 atmospheres, spray volume 180-200 liters / ha, spray bar from the ground height 40 ~ 60cm, spraying The speed is 6-8 km/h. Misunderstanding: The effect of applying pesticide after rain is good. The farmers in the north of the country waited for more rain and medicine in spring. They only paid attention to the pre-emergence herbicide requirements for public opinion, but brought a series of problems: 1) During the period of missed shoots absorption, the drug is not in contact with the young shoots. 2) Disadvantages of applying pesticides after rain: After the rain, the soil moisture goes upward. It is difficult for the herbicides to reach the 0-5 cm tillage layer to be absorbed by the weeds. After the spring rains, sunny high temperature weather often occurs, and the herbicides can be lost as the water evaporates. Applying before or before irrigation is better than applying after spraying. The application of pesticides after raining should also be done in a timely manner by lightly mixing the soil or cultivating 2 cm in time to prevent loss of herbicides due to evaporation and wind blowing. Picc Line Cover,Picc Line Sleeve,Picc Line Shower Cover,Picc Line Waterproof Cover Wenzhou Celecare Medical Instruments Co.,Ltd , https://www.celecaremed.com