How to take advantage of the safe use of Atrazine

Atrazine is also known as Atrazine. The main dosage forms are: 50%, 80% WP, 38%, 40% SC, 4%, 8%, 20% GR, etc. It is a selective pre-emergence and post- emergence herbicide . Control of annual broadleaf weeds and grass weeds, control broadleaf weeds better than grass weeds, and also have a certain inhibitory effect on perennial weeds. Before the weed germination or 1 to 3 leaf stage after the bud, use 38% of atrazine suspension agent per acre 200-250 ml. Due to its long-lasting effect, it is generally used in combination with other herbicides to reduce the amount of production and reduce the occurrence of phytotoxicity.

Table 1 The herbicidal spectrum and herbicidal effect of atrazine

However, atrazine is a long-acting pre-emergence herbicide with a half-life of 35 to 50 days in the soil. The clay soil of the clay soil has strong adsorption to the drug, and the residual time is longer, which often occurs in some crops. The phytotoxicity, except for the northeast can be used alone, and other areas are generally used in combination. It has been reported that different types of maize varieties have different resistance to atrazine, and this drug cannot be used in corn inbred lines, sweet corn, waxy corn, popcorn field and corn field. It is best not to use this medicine in sweet corn fields to avoid phytotoxicity.

After the application of atrazine in the northeastern region such as Heilongjiang, the soybean growth will be severely inhibited or the dead seedlings will be produced, resulting in a significant reduction in production. In the northeast region, if atrazine + acetochlor (isopropachlor, metolachlor) + 2,4-diisooctyl ester is used in the corn field, the annual active ingredient of atrazine is less than 1,710 g/ha. After the sputum can be carefully planted with spring soybeans; the annual use of the active ingredients of atrazine is 1,710-2,400 g/ha. After the rain in the spring and the sun is sufficient after the rain, the phytotoxicity is serious, and the yield reduction is obvious. It is not recommended to plant spring soybeans. Planting silage corn, fresh corn, sorghum, scorpion, etc.; the annual use of the active ingredient of atrazine is higher than 2,400 grams, and the sorghum can only grow silage corn, fresh corn or popcorn.

In the Huanghuai region, corn and wheat rotation, when the corn acre using the active ingredient of atrazine is more than 80 grams, it is easy to cause low wheat emergence rate or inhibit seedling growth. Corn, rice rotation, when the corn acre with the active ingredient of atrazine exceeds 70 grams, it is easy to cause phytotoxicity to the sorghum rice.

Sweet corn is a crop that has been widely planted in South China in recent years. Due to the special climatic conditions in Guangdong, it can be planted 2 to 3 times a year. Therefore, the herbicide, atrazine, which is safe for sweet corn, is frequently used, resulting in soil contamination. In the south, sweet corn and sticky corn are used in atrazine. When the green tea is harvested, the cruciferous vegetables and legumes are planted, which often causes chlorosis, leaf curl and plant dwarf. In the case of corn fields intercropped with beans, atrazine cannot be used.

When using atrazine, when the liquid is drifted due to improper use of the wind or the method, it may cause yellowing of the leaves or curling of the leaves of adjacent watermelons, cucumbers, beans, peach trees, poplars, jujubes, etc. Phenomenon, when severe, leaves will fall off. Crops such as wheat, rice, spinach, cucumber, watermelon, tomato, cabbage, cauliflower, kale and canola are very sensitive to atrazine. In the soil, when the amount of atrazine remaining in the soil exceeds 0.080 mg, the growth of Chinese cabbage is obviously inhibited; when it exceeds 0.104 mg, the growth of cabbage is abnormal; when it exceeds 0.081 mg, the growth of indica rice is abnormal. That is to say, when there is even a little bit of atrazine remaining in the soil, the growth of the above-mentioned atrazine-sensitive crops will be problematic.

Some scholars have divided the resistance of atrazine to crops or vegetables into four categories:

Highly resistant crops: corn, sorghum, sugar cane;

Moderately resistant crops: sunflower, celery, kale, tobacco;

Weakly resistant crops: pepper, wheat, soybean, flax, oatmeal;

Very weak resistant crops: cucumber, watermelon, peach, millet, rice.

According to the actual situation in the locality, pay attention and attention when changing and applying Atrazine to reduce or avoid unnecessary losses. The industry has a common understanding that environmental pollution can be caused to groundwater or surrounding water sources due to the application of runoff or leaching after the trip to Tianjin. There are also many negative reports on the torazine in Europe and the United States. It has been pointed out that due to the pollution of water sources, it has a great impact on the reproduction of frogs, and there are reports that affect people's health.

How to avoid the residual troubles of Atrazine?

1 Turn the soil deep, first use the deep plough to turn it over, and try to turn the residual components of atrazine in the topsoil below;

2 Add biological fertilizer and fermented farmyard manure to accelerate the decomposition of residual atrazine. Rotating 2 to 3 times of soil after application;

3 first planting sorghum or transplanting fruit trees, but when planting fruit trees, roots should be treated with rooting powder to accelerate the growth of new roots;

4 combined with soil disinfection to prevent soil-borne root diseases, it has been found that ground soil can be used to treat soil, and it can also reduce the residual phytotoxicity of atrazine;

5 The use of ammonium nitrogen fertilizer can also reduce the damage of atrazine to crops.

More pesticide knowledge , please pay attention to China Pesticide Network

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